Native plants · Maine

Native plants of Washington County

579 plant species are recorded as native to Maine in Kew’s World Checklist of Vascular Plants and USDA PLANTS, and recorded in Washington County by USDA PLANTS. 270 of them have growing records you can filter by light, moisture, height and estimated cold hardiness. 5 more species are listed as both native and introduced and kept in a separate section.

County summary · USDA PLANTS and Kew WCVP

Washington County, Maine

Native species: 579 Typical Maine county: 681 (median of 16 counties)
Garden-ready natives: 270 Typical Maine county: 303
Share by type (all 579 native species): Percent of the 579 native species in each growth type

Tree 10% (60)
Shrub 10% (57)
Wildflower (forb) 46% (268)
Grass or grass-like 26% (149)
Vine 2% (12)
Fern 6% (33)

Wildflowers make up the largest share of the native list (46%), followed by grasses and grass-like plants (26%).

Recorded native ranges can include long-established populations that spread from gardens; check your state’s native plant society list for local guidance. How native status is decided.

ZIP codes mainly in this county fall in USDA hardiness zones 4b to 6a (2023 map).

The native plant list

Garden-ready natives 270

Native species with PLANTS growing records (height, light, moisture, minimum temperature). “—” means PLANTS has no value.

Garden-ready native plants of Washington County, Maine
Plant	Type	Height	Light	Water use	Hardy to
alderleaf buckthorn Rhamnus alnifolia	Shrub	3 ft	Shade-tolerant	High	Zone 4a
alkali buttercup Ranunculus cymbalaria	Wildflower (forb)	1 ft	Shade-tolerant	High	Zone 3b
Allegheny blackberry Rubus allegheniensis	Shrub	6 ft	Shade-tolerant	Medium	Zone 4b
alternateleaf dogwood Cornus alternifolia	Tree	25 ft	Shade-tolerant	Medium	Zone 2b
American basswood Tilia americana	Tree	100 ft	Shade-tolerant	Medium	Zone 2b
American beachgrass Ammophila breviligulata	Grass or grass-like	2.5 ft	Sun	Medium	Zone 4b
American beech Fagus grandifolia	Tree	80 ft	Shade-tolerant	Medium	Zone 3a
American black currant Ribes americanum	Shrub	3 ft	—	—	Zone 2b
American bur-reed Sparganium americanum	Wildflower (forb)	3.2 ft	Sun–part shade	High	Zone 4a
American dunegrass Leymus mollis	Grass or grass-like	4 ft	Sun	Medium	Zone 8a
American elm Ulmus americana	Tree	120 ft	Sun–part shade	High	Zone 2b
American mountain ash Sorbus americana	Tree	40 ft	Sun–part shade	Medium	Zone 3b
American water horehound Lycopus americanus	Wildflower (forb)	1.8 ft	Shade-tolerant	High	Zone 3b
American water plantain Alisma subcordatum	Wildflower (forb)	6 in	Sun	High	Zone 4a
American witchhazel Hamamelis virginiana	Tree	20 ft	Sun–part shade	Medium	Zone 4b
annual wildrice Zizania aquatica	Grass or grass-like	9.8 ft	Sun	High	Zone 10b
arborvitae Thuja occidentalis	Tree	50 ft	Sun–part shade	Medium	Zone 4a
arctic sweet coltsfoot Petasites frigidus	Wildflower (forb)	10 in	Sun–part shade	High	Zone 3b
arrowleaf tearthumb Polygonum sagittatum	Vine	1 ft	Sun	Medium	Zone 6a
arumleaf arrowhead Sagittaria cuneata	Wildflower (forb)	2.6 ft	Sun	Medium	Zone 4a
awlfruit sedge Carex stipata	Grass or grass-like	3.5 ft	Shade-tolerant	Medium	Zone 3b
balsam fir Abies balsamea	Tree	60 ft	Shade-tolerant	Medium	Zone 3a
balsam poplar Populus balsamifera	Tree	80 ft	Sun	High	Zone 1a
beach pea Lathyrus japonicus	Vine	1.5 ft	Sun–part shade	Medium	Zone 4a
beaked hazelnut Corylus cornuta	Tree	15 ft	Shade-tolerant	Medium	Zone 2b
bigleaf aster Eurybia macrophylla	Wildflower (forb)	4.6 ft	Shade-tolerant	Medium	Zone 4b
bigtooth aspen Populus grandidentata	Tree	65 ft	Sun	High	Zone 3a
black ash Fraxinus nigra	Tree	65 ft	Sun	High	Zone 2b
black chokeberry Aronia melanocarpa	Shrub	6 ft	Shade-tolerant	—	Zone 9b
black huckleberry Gaylussacia baccata	Shrub	4 ft	Shade-tolerant	Low	Zone 4a
black spruce Picea mariana	Tree	65 ft	Shade-tolerant	High	Zone 1a
blackeyed Susan Rudbeckia hirta	Wildflower (forb)	1 ft	Sun	Medium	Zone 5a
blister sedge Carex vesicaria	Grass or grass-like	3 ft	Sun–part shade	High	Zone 3b
bluebead Clintonia borealis	Wildflower (forb)	1.1 ft	Sun	Medium	Zone 4a
bluejoint Calamagrostis canadensis	Grass or grass-like	4.9 ft	Sun	Medium	Zone 4a
blunt broom sedge Carex tribuloides	Grass or grass-like	3 ft	Shade-tolerant	Medium	Zone 4b
bog goldenrod Solidago uliginosa	Wildflower (forb)	2.5 ft	Sun–part shade	High	Zone 5a
bog Labrador tea Ledum groenlandicum	Shrub	3 ft	Sun–part shade	Medium	Zone 4a
bog laurel Kalmia polifolia	Shrub	1 ft	Shade-tolerant	Medium	Zone 4b
bog muhly Muhlenbergia uniflora	Grass or grass-like	1.2 ft	Sun	High	Zone 4a
bog willowherb Epilobium leptophyllum	Wildflower (forb)	3.6 ft	Sun–part shade	High	Zone 4a
bristly dewberry Rubus hispidus	Shrub	2 ft	Sun	High	Zone 3b
bristlystalked sedge Carex leptalea	Grass or grass-like	1.5 ft	Shade-tolerant	High	Zone 4a
broadfruit bur-reed Sparganium eurycarpum	Wildflower (forb)	4.9 ft	Sun–part shade	High	Zone 4a
broadleaf arrowhead Sagittaria latifolia	Wildflower (forb)	4.9 ft	Sun	High	Zone 4a
broadleaf cattail Typha latifolia	Wildflower (forb)	5 ft	Sun–part shade	High	Zone 3b
broadleaf rosette grass Dichanthelium latifolium	Grass or grass-like	3.3 ft	Sun–part shade	Low	Zone 3a
broom sedge Carex scoparia	Grass or grass-like	2.5 ft	Shade-tolerant	High	Zone 3b
buckbean Menyanthes trifoliata	Wildflower (forb)	10 in	Sun–part shade	High	Zone 4a
bunchberry dogwood Cornus canadensis	Shrub	6 in	Shade-tolerant	High	Zone 4b
calico aster Symphyotrichum lateriflorum	Wildflower (forb)	4 ft	Sun	Medium	Zone 4a
Canada germander Teucrium canadense	Wildflower (forb)	3.3 ft	Sun–part shade	High	Zone 3a
Canada goldenrod Solidago canadensis	Wildflower (forb)	3.5 ft	Sun	Medium	Zone 3a
Canada yew Taxus canadensis	Shrub	5 ft	Shade-tolerant	Medium	Zone 4b
Canadian horseweed Conyza canadensis	Wildflower (forb)	5 ft	Sun	Medium	Zone 12b
Canadian lousewort Pedicularis canadensis	Wildflower (forb)	1.3 ft	Shade-tolerant	Medium	Zone 3a
Canadian rush Juncus canadensis	Grass or grass-like	3.2 ft	Sun–part shade	Medium	Zone 4a
Canadian serviceberry Amelanchier canadensis	Tree	23 ft	Sun–part shade	Medium	Zone 4a
cardinalflower Lobelia cardinalis	Wildflower (forb)	5.9 ft	Shade-tolerant	Low	Zone 4a
Carolina rose Rosa carolina	Shrub	5 ft	Sun–part shade	Low	Zone 3a
chokecherry Prunus virginiana	Tree	25 ft	Sun	Medium	Zone 3a
cinnamon fern Osmunda cinnamomea	Fern	4.9 ft	Shade-tolerant	Medium	Zone 4a
cloudberry Rubus chamaemorus	Wildflower (forb)	1 ft	Sun–part shade	High	Zone 3b
common blue violet Viola sororia	Wildflower (forb)	4 in	Sun–part shade	High	Zone 4b
common buttonbush Cephalanthus occidentalis	Tree	15 ft	Shade-tolerant	High	Zone 4a
common cowparsnip Heracleum maximum	Wildflower (forb)	8 ft	Sun	High	Zone 3b
common evening primrose Oenothera biennis	Wildflower (forb)	5 ft	Sun	Medium	Zone 4b
common juniper Juniperus communis	Tree	10 ft	Sun	Low	Zone 3a
common mare's-tail Hippuris vulgaris	Wildflower (forb)	2.8 ft	Sun	High	Zone 3b
common rush Juncus effusus	Grass or grass-like	6.6 ft	Sun	Medium	Zone 3b
common selfheal Prunella vulgaris	Wildflower (forb)	1.5 ft	Sun–part shade	Medium	Zone 3b
common serviceberry Amelanchier arborea	Tree	36 ft	Shade-tolerant	Medium	Zone 2b
common snowberry Symphoricarpos albus	Shrub	3 ft	Sun	Medium	Zone 3b
common spikerush Eleocharis palustris	Grass or grass-like	1.3 ft	Sun	High	Zone 3b
common threesquare Schoenoplectus pungens	Grass or grass-like	4.9 ft	Sun	High	Zone 3b
common winterberry Ilex verticillata	Tree	10 ft	Sun–part shade	High	Zone 4b
cosmopolitan bulrush Bolboschoenus maritimus	Grass or grass-like	3.2 ft	Sun	Medium	Zone 5a
creeping snowberry Gaultheria hispidula	Shrub	6 in	Shade-tolerant	Medium	Zone 4b
crested woodfern Dryopteris cristata	Fern	1.6 ft	Shade-tolerant	High	Zone 4a
devil's beggartick Bidens frondosa	Wildflower (forb)	4 ft	Sun–part shade	Medium	Zone 12a
devil's darning needles Clematis virginiana	Vine	15 ft	Sun–part shade	Medium	Zone 3b
Dewey sedge Carex deweyana	Grass or grass-like	3.8 ft	Shade-tolerant	Medium	Zone 4a
diamondleaf willow Salix planifolia	Tree	8 ft	Sun	Medium	Zone 3b
dotted smartweed Polygonum punctatum	Wildflower (forb)	3.2 ft	Sun	Medium	Zone 10b
drooping woodreed Cinna latifolia	Grass or grass-like	4.5 ft	Sun–part shade	High	Zone 3b
dwarf bilberry Vaccinium cespitosum	Shrub	1 ft	Shade-tolerant	High	Zone 4a
dwarf spikerush Eleocharis parvula	Grass or grass-like	1.2 ft	Sun	Medium	Zone 3b
dwarf St. Johnswort Hypericum mutilum	Wildflower (forb)	2.6 ft	Sun–part shade	Medium	Zone 5a
eastern hemlock Tsuga canadensis	Tree	105 ft	Shade-tolerant	Medium	Zone 4a
eastern rough sedge Carex scabrata	Grass or grass-like	3 ft	Shade-tolerant	High	Zone 4a
eastern teaberry Gaultheria procumbens	Shrub	6 in	Shade-tolerant	Low	Zone 4a
eastern white pine Pinus strobus	Tree	150 ft	Sun–part shade	Medium	Zone 4a
field horsetail Equisetum arvense	Fern	11 in	Sun–part shade	High	Zone 3a
field pussytoes Antennaria neglecta	Wildflower (forb)	1 ft	Sun	Low	Zone 3b
fireweed Chamerion angustifolium	Wildflower (forb)	5.5 ft	Sun–part shade	High	Zone 3b
flatstem pondweed Potamogeton zosteriformis	Wildflower (forb)	—	Sun	High	Zone 3b
flattened oatgrass Danthonia compressa	Grass or grass-like	2.4 ft	Shade-tolerant	Medium	Zone 4a
floating pondweed Potamogeton natans	Wildflower (forb)	—	Sun	High	Zone 3b
fowl bluegrass Poa palustris	Grass or grass-like	4 ft	Sun–part shade	Medium	Zone 3b
fowl mannagrass Glyceria striata	Grass or grass-like	5.7 ft	Shade-tolerant	Medium	Zone 3b
fox sedge Carex vulpinoidea	Grass or grass-like	3.2 ft	Sun–part shade	Medium	Zone 3b
fringed brome Bromus ciliatus	Grass or grass-like	4 ft	Shade-tolerant	Medium	Zone 7a
fringed sedge Carex crinita	Grass or grass-like	5.2 ft	Sun–part shade	Medium	Zone 4a
giant goldenrod Solidago gigantea	Wildflower (forb)	8.2 ft	Sun–part shade	Medium	Zone 4a
golden ragwort Packera aurea	Wildflower (forb)	3.9 ft	Shade-tolerant	High	Zone 3a
golden sedge Carex aurea	Grass or grass-like	1.2 ft	Sun–part shade	High	Zone 4a
gray alder Alnus incana	Tree	25 ft	Sun–part shade	High	Zone 4a
gray birch Betula populifolia	Tree	25 ft	Sun–part shade	Low	Zone 3b
gray goldenrod Solidago nemoralis	Wildflower (forb)	2 ft	Sun	Medium	Zone 4a
greater bladder sedge Carex intumescens	Grass or grass-like	3 ft	Shade-tolerant	High	Zone 4a
greater creeping spearwort Ranunculus flammula	Wildflower (forb)	1.5 ft	Shade-tolerant	High	Zone 4a
greater straw sedge Carex normalis	Grass or grass-like	5 ft	Shade-tolerant	High	Zone 4a
green alder Alnus viridis	Tree	10 ft	Sun–part shade	High	Zone 1a
green ash Fraxinus pennsylvanica	Tree	80 ft	Shade-tolerant	Medium	Zone 2b
green bulrush Scirpus atrovirens	Grass or grass-like	5.9 ft	Sun	Medium	Zone 2a
groundnut Apios americana	Vine	1 ft	Shade-tolerant	Medium	Zone 5a
hairy sedge Carex lacustris	Grass or grass-like	5 ft	Shade-tolerant	High	Zone 4b
hardstem bulrush Schoenoplectus acutus	Grass or grass-like	9.8 ft	Sun	High	Zone 3b
highbush blueberry Vaccinium corymbosum	Shrub	12 ft	Shade-tolerant	Medium	Zone 4a
hobblebush Viburnum lantanoides	Shrub	10 ft	Shade-tolerant	Medium	Zone 3b
hooded lady's tresses Spiranthes romanzoffiana	Wildflower (forb)	2.5 ft	Sun–part shade	High	Zone 3b
hop sedge Carex lupulina	Grass or grass-like	4.3 ft	Sun–part shade	Medium	Zone 3b
hophornbeam Ostrya virginiana	Tree	45 ft	Shade-tolerant	Low	Zone 3b
interrupted fern Osmunda claytoniana	Fern	4 ft	Shade-tolerant	High	Zone 3b
Jack in the pulpit Arisaema triphyllum	Wildflower (forb)	1.5 ft	Shade-tolerant	High	Zone 5b
jack pine Pinus banksiana	Tree	80 ft	Sun	Low	Zone 2a
jewelweed Impatiens capensis	Wildflower (forb)	4.9 ft	Shade-tolerant	Medium	Zone 10b
jointleaf rush Juncus articulatus	Grass or grass-like	2 ft	Sun–part shade	High	Zone 4b
kinnikinnick Arctostaphylos uva-ursi	Shrub	6 in	Sun–part shade	Low	Zone 4a
lakeshore sedge Carex lenticularis	Grass or grass-like	1.6 ft	Sun–part shade	High	Zone 3b
largeleaf pondweed Potamogeton amplifolius	Wildflower (forb)	—	Sun	High	Zone 4a
lavender thrift Limonium carolinianum	Wildflower (forb)	2 ft	Sun	High	Zone 6b
leatherleaf Chamaedaphne calyculata	Shrub	4 ft	Sun–part shade	High	Zone 4b
lingonberry Vaccinium vitis-idaea	Shrub	6 in	Sun	—	Zone 1a
little green sedge Carex viridula	Grass or grass-like	1.5 ft	Sun	High	Zone 3b
littleleaf buttercup Ranunculus abortivus	Wildflower (forb)	2.8 ft	Shade-tolerant	Medium	Zone 3a
longhair sedge Carex comosa	Grass or grass-like	5 ft	Sun–part shade	High	Zone 4b
lowbush blueberry Vaccinium angustifolium	Shrub	2 ft	Sun	Medium	Zone 4a
marsh seedbox Ludwigia palustris	Wildflower (forb)	2 in	Sun	High	Zone 4a
melic mannagrass Glyceria melicaria	Grass or grass-like	3.9 ft	Sun	Medium	Zone 4a
Mexican muhly Muhlenbergia mexicana	Grass or grass-like	3 ft	Sun–part shade	Medium	Zone 4a
Missouri River willow Salix eriocephala	Tree	52 ft	Shade-tolerant	High	Zone 3b
mountain laurel Kalmia latifolia	Tree	6 ft	Shade-tolerant	Low	Zone 5a
mountain maple Acer spicatum	Tree	25 ft	Shade-tolerant	Medium	Zone 2b
mud sedge Carex limosa	Grass or grass-like	1.8 ft	Sun	Medium	Zone 4a
nannyberry Viburnum lentago	Tree	28 ft	Shade-tolerant	Medium	Zone 4a
necklace sedge Carex projecta	Grass or grass-like	2 ft	Shade-tolerant	Medium	Zone 4a
needle spikerush Eleocharis acicularis	Grass or grass-like	8 in	Sun	Medium	Zone 5a
nerveless woodland sedge Carex leptonervia	Grass or grass-like	2 ft	Shade-tolerant	Medium	Zone 4a
New York aster Symphyotrichum novi-belgii	Wildflower (forb)	6 ft	Sun	High	Zone 4a
New York fern Thelypteris noveboracensis	Fern	1.5 ft	Shade-tolerant	Low	Zone 4b
nodding beggartick Bidens cernua	Wildflower (forb)	3.2 ft	Sun–part shade	High	Zone 12a
nodding waternymph Najas flexilis	Wildflower (forb)	2.5 ft	Sun–part shade	High	Zone 12a
northern bayberry Morella pensylvanica	Tree	12 ft	Sun	Medium	Zone 4b
northern bedstraw Galium boreale	Wildflower (forb)	3 ft	Sun–part shade	Medium	Zone 4a
northern bush honeysuckle Diervilla lonicera	Shrub	2.4 ft	Sun–part shade	Low	Zone 5a
northern mountain ash Sorbus decora	Tree	40 ft	Shade-tolerant	Low	Zone 2a
northern red oak Quercus rubra	Tree	81 ft	Sun–part shade	Medium	Zone 3b
northern St. Johnswort Hypericum boreale	Wildflower (forb)	10 in	Sun–part shade	High	Zone 4a
Northwest Territory sedge Carex utriculata	Grass or grass-like	3.5 ft	Sun	High	Zone 3a
panicled bulrush Scirpus microcarpus	Grass or grass-like	5.5 ft	Sun	Medium	Zone 3b
paper birch Betula papyrifera	Tree	70 ft	Sun	High	Zone 1a
Pennsylvania bittercress Cardamine pensylvanica	Wildflower (forb)	1.5 ft	Shade-tolerant	Medium	Zone 4a
Pennsylvania buttercup Ranunculus pensylvanicus	Wildflower (forb)	3.9 ft	Shade-tolerant	High	Zone 4b
pickerelweed Pontederia cordata	Wildflower (forb)	3.2 ft	Sun	High	Zone 5a
pipsissewa Chimaphila umbellata	Shrub	1.5 ft	Shade-tolerant	Low	Zone 3b
poverty rush Juncus tenuis	Grass or grass-like	1.5 ft	Sun–part shade	Medium	Zone 3b
prairie cordgrass Spartina pectinata	Grass or grass-like	8 ft	Sun	High	Zone 3b
prairie fleabane Erigeron strigosus	Wildflower (forb)	3 ft	Sun	Medium	Zone 4b
prairie willow Salix humilis	Shrub	10 ft	Sun–part shade	High	Zone 3a
prickly currant Ribes lacustre	Shrub	3 ft	Shade-tolerant	—	Zone 1a
purpleflowering raspberry Rubus odoratus	Shrub	5 ft	Sun–part shade	Medium	Zone 3b
purplestem aster Symphyotrichum puniceum	Wildflower (forb)	8.1 ft	Sun	High	Zone 3b
pussy willow Salix discolor	Tree	40 ft	Shade-tolerant	High	Zone 4a
quaking aspen Populus tremuloides	Tree	65 ft	Sun	High	Zone 1a
quill sedge Carex tenera	Grass or grass-like	2.5 ft	Shade-tolerant	Medium	Zone 4a
rattlesnake fern Botrychium virginianum	Fern	1.4 ft	Shade-tolerant	Medium	Zone 3b
rattlesnake mannagrass Glyceria canadensis	Grass or grass-like	3.2 ft	Sun	Medium	Zone 4a
red currant Ribes triste	Shrub	2 ft	Shade-tolerant	Medium	Zone 1a
red elderberry Sambucus racemosa	Tree	18 ft	Sun–part shade	High	Zone 4a
red maple Acer rubrum	Tree	68 ft	Sun–part shade	High	Zone 2b
red pine Pinus resinosa	Tree	80 ft	Sun	Low	Zone 3a
red spruce Picea rubens	Tree	110 ft	Shade-tolerant	Medium	Zone 2b
redosier dogwood Cornus sericea	Tree	12 ft	Sun	High	Zone 3b
reed canarygrass Phalaris arundinacea	Grass or grass-like	5 ft	Sun	High	Zone 3b
rhodora Rhododendron canadense	Shrub	18 ft	Shade-tolerant	High	Zone 5a
ribbonleaf pondweed Potamogeton epihydrus	Wildflower (forb)	—	Sun	High	Zone 4a
rice cutgrass Leersia oryzoides	Grass or grass-like	4.9 ft	Sun	High	Zone 4a
roadside agrimony Agrimonia striata	Wildflower (forb)	6 ft	Shade-tolerant	Medium	Zone 3a
Robbins' pondweed Potamogeton robbinsii	Wildflower (forb)	—	Sun	High	Zone 3b
rough avens Geum laciniatum	Wildflower (forb)	3.1 ft	Sun–part shade	Medium	Zone 5a
rough bentgrass Agrostis scabra	Grass or grass-like	2.5 ft	Sun	Medium	Zone 3b
roundleaf dogwood Cornus rugosa	Tree	10 ft	Shade-tolerant	Low	Zone 4b
roundleaf serviceberry Amelanchier sanguinea	Tree	10 ft	Shade-tolerant	Medium	Zone 3a
sago pondweed Stuckenia pectinata	Wildflower (forb)	—	Sun	High	Zone 3b
saltgrass Distichlis spicata	Grass or grass-like	1.1 ft	Sun	Medium	Zone 3b
saltmeadow cordgrass Spartina patens	Grass or grass-like	2 ft	Sun	High	Zone 7a
sea milkwort Glaux maritima	Wildflower (forb)	11 in	Sun	High	Zone 4a
seaside goldenrod Solidago sempervirens	Wildflower (forb)	3.5 ft	Sun	Low	Zone 6a
shallow sedge Carex lurida	Grass or grass-like	3.2 ft	Sun–part shade	Medium	Zone 4a
shining willow Salix lucida	Tree	13 ft	Sun–part shade	High	Zone 3a
shortawn foxtail Alopecurus aequalis	Grass or grass-like	2.5 ft	Sun–part shade	High	Zone 3b
silky dogwood Cornus amomum	Shrub	10 ft	Sun–part shade	High	Zone 3b
silky willow Salix sericea	Tree	12 ft	Sun–part shade	High	Zone 4b
silverweed cinquefoil Argentina anserina	Wildflower (forb)	6 in	Shade-tolerant	High	Zone 5a
silvery sedge Carex canescens	Grass or grass-like	2 ft	Sun–part shade	High	Zone 4a
slender cottongrass Eriophorum gracile	Grass or grass-like	1.7 ft	Sun	High	Zone 3a
slender spikerush Eleocharis tenuis	Grass or grass-like	2.9 ft	Sun	Low	Zone 5a
slender wheatgrass Elymus trachycaulus	Grass or grass-like	3 ft	Sun	Medium	Zone 3b
small enchanter's nightshade Circaea alpina	Wildflower (forb)	11 in	Shade-tolerant	Medium	Zone 3b
small floating mannagrass Glyceria borealis	Grass or grass-like	4.9 ft	Sun	High	Zone 4a
small white violet Viola macloskeyi	Wildflower (forb)	6 in	Shade-tolerant	High	Zone 4b
smooth cordgrass Spartina alterniflora	Grass or grass-like	3.5 ft	Sun	High	Zone 5a
softleaf sedge Carex disperma	Grass or grass-like	2 ft	Sun–part shade	High	Zone 3b
softstem bulrush Schoenoplectus tabernaemontani	Grass or grass-like	9 ft	Sun	High	Zone 3b
southern arrowwood Viburnum dentatum	Tree	8 ft	Sun–part shade	—	Zone 5a
spike trisetum Trisetum spicatum	Grass or grass-like	1.9 ft	Sun–part shade	Medium	Zone 3b
spiked muhly Muhlenbergia glomerata	Grass or grass-like	3 ft	Sun–part shade	Medium	Zone 4a
spotted joe pye weed Eutrochium maculatum	Wildflower (forb)	6 ft	Sun–part shade	High	Zone 4b
staghorn sumac Rhus typhina	Tree	30 ft	Sun–part shade	Low	Zone 4a
star sedge Carex echinata	Grass or grass-like	1.5 ft	Sun–part shade	High	Zone 3b
steeplebush Spiraea tomentosa	Shrub	4 ft	Sun	Low	Zone 4a
stiff clubmoss Lycopodium annotinum	Fern	1 ft	Shade-tolerant	High	Zone 3a
striped maple Acer pensylvanicum	Tree	35 ft	Shade-tolerant	Low	Zone 2b
sugar maple Acer saccharum	Tree	100 ft	Shade-tolerant	Medium	Zone 2b
swamp milkweed Asclepias incarnata	Wildflower (forb)	4.9 ft	Sun	High	Zone 3b
swamp rose Rosa palustris	Shrub	8.2 ft	Shade-tolerant	Medium	Zone 4a
swamp smartweed Polygonum hydropiperoides	Wildflower (forb)	—	Sun	Medium	Zone 10b
sweet fern Comptonia peregrina	Shrub	2 ft	Sun–part shade	Low	Zone 3b
sweet woodreed Cinna arundinacea	Grass or grass-like	4.9 ft	Shade-tolerant	Low	Zone 4a
sweetgale Myrica gale	Shrub	6 ft	Shade-tolerant	Medium	Zone 4a
sweetgrass Hierochloe odorata	Grass or grass-like	2 ft	Sun–part shade	High	Zone 3b
tall cinquefoil Potentilla arguta	Wildflower (forb)	3 ft	Sun–part shade	Medium	Zone 3b
tamarack Larix laricina	Tree	80 ft	Sun	Medium	Zone 1a
tapertip rush Juncus acuminatus	Grass or grass-like	3 ft	Sun–part shade	High	Zone 4a
tawny cottongrass Eriophorum virginicum	Grass or grass-like	3.9 ft	Sun	Medium	Zone 4a
three-way sedge Dulichium arundinaceum	Grass or grass-like	2.6 ft	Sun–part shade	High	Zone 3b
threelobe beggarticks Bidens tripartita	Wildflower (forb)	3.5 ft	Sun–part shade	High	Zone 12a
threepetal bedstraw Galium trifidum	Vine	10 in	Sun–part shade	High	Zone 3b
threeseeded sedge Carex trisperma	Grass or grass-like	1.9 ft	Shade-tolerant	High	Zone 4a
toad rush Juncus bufonius	Grass or grass-like	1 ft	Sun	Medium	Zone 12a
tufted bulrush Trichophorum cespitosum	Grass or grass-like	1.3 ft	Sun–part shade	Medium	Zone 3a
tufted hairgrass Deschampsia cespitosa	Grass or grass-like	3.4 ft	Sun	Low	Zone 3b
tufted loosestrife Lysimachia thyrsiflora	Wildflower (forb)	2 ft	Sun–part shade	High	Zone 4a
twoheaded water-starwort Callitriche heterophylla	Wildflower (forb)	—	Sun	High	Zone 4a
upland bentgrass Agrostis perennans	Grass or grass-like	3.5 ft	Sun–part shade	High	Zone 4a
upright sedge Carex stricta	Grass or grass-like	4.2 ft	Shade-tolerant	Medium	Zone 3b
variableleaf pondweed Potamogeton gramineus	Wildflower (forb)	—	Sun	High	Zone 3b
vernal water-starwort Callitriche palustris	Wildflower (forb)	10 in	Sun	Medium	Zone 4a
Virginia rose Rosa virginiana	Shrub	6 ft	Sun–part shade	Medium	Zone 5b
Virginia wildrye Elymus virginicus	Grass or grass-like	2.5 ft	Shade-tolerant	Medium	Zone 4b
water horsetail Equisetum fluviatile	Fern	3 ft	Sun	High	Zone 4a
water knotweed Polygonum amphibium	Wildflower (forb)	1 in	Sun	High	Zone 5a
water sedge Carex aquatilis	Grass or grass-like	2.9 ft	Sun	High	Zone 3b
wavy hairgrass Deschampsia flexuosa	Grass or grass-like	2.6 ft	Shade-tolerant	Medium	Zone 3b
western pearly everlasting Anaphalis margaritacea	Wildflower (forb)	3 ft	Sun–part shade	Medium	Zone 3a
white ash Fraxinus americana	Tree	90 ft	Sun	High	Zone 4a
white avens Geum canadense	Wildflower (forb)	3.9 ft	Shade-tolerant	Medium	Zone 4a
white edge sedge Carex debilis	Grass or grass-like	3 ft	Shade-tolerant	High	Zone 6a
white meadowsweet Spiraea alba	Shrub	3 ft	Sun–part shade	Medium	Zone 4a
white panicle aster Symphyotrichum lanceolatum	Wildflower (forb)	6 ft	Sun–part shade	High	Zone 3b
white spruce Picea glauca	Tree	100 ft	Sun–part shade	Medium	Zone 1a
widgeongrass Ruppia maritima	Wildflower (forb)	2 in	Sun	High	Zone 7a
wild sarsaparilla Aralia nudicaulis	Wildflower (forb)	1.5 ft	Shade-tolerant	Medium	Zone 3b
woodland horsetail Equisetum sylvaticum	Fern	11 in	Shade-tolerant	Low	Zone 3a
woodland muhly Muhlenbergia sylvatica	Grass or grass-like	3 ft	Sun–part shade	Medium	Zone 4b
woolgrass Scirpus cyperinus	Grass or grass-like	4.9 ft	Sun–part shade	High	Zone 4a
wrinkleleaf goldenrod Solidago rugosa	Wildflower (forb)	3.3 ft	Sun–part shade	Medium	Zone 4a
yellow birch Betula alleghaniensis	Tree	75 ft	Sun–part shade	Medium	Zone 2b
zigzag goldenrod Solidago flexicaulis	Wildflower (forb)	3 ft	Sun–part shade	Medium	Zone 5b

Other native species recorded here 309

PLANTS has no growing records for these, so light, moisture, height and zone filters cannot include them. Many are wild species seldom sold by nurseries.

Allegheny monkeyflower Mimulus ringens
alpine pondweed Potamogeton alpinus
American burnweed Erechtites hieraciifolius
American false pennyroyal Hedeoma pulegioides
American featherfoil Hottonia inflata
American fly honeysuckle Lonicera canadensis
American golden saxifrage Chrysosplenium americanum
American hogpeanut Amphicarpaea bracteata
American mannagrass Glyceria grandis
American marshpennywort Hydrocotyle americana
American searocket Cakile edentula
American spikenard Aralia racemosa
American spurred gentian Halenia deflexa
American waterwort Elatine americana
American white waterlily Nymphaea odorata
American wintergreen Pyrola americana
arrowleaf violet Viola sagittata
bald spikerush Eleocharis erythropoda
bay forget-me-not Myosotis laxa
bayberry willow Salix myricoides
bayonet rush Juncus militaris
Bebb willow Salix bebbiana
Beck's water-marigold Bidens beckii
beechdrops Epifagus virginiana
Bicknell's cranesbill Geranium bicknellii
Blue Ridge sedge Carex lucorum
bluntleaf pondweed Potamogeton obtusifolius
bluntleaf sandwort Moehringia lateriflora
bluntleaved orchid Platanthera obtusata
bog rosemary Andromeda polifolia
bog white violet Viola lanceolata
bog willow Salix pedicellaris
bog yellowcress Rorippa palustris
bog yelloweyed grass Xyris difformis
boreal bog sedge Carex magellanica
boreal starwort Stellaria borealis
bottlebrush sedge Carex hystericina
bristly sarsaparilla Aralia hispida
brittle bladderfern Cystopteris fragilis
broad looseflower sedge Carex laxiflora
brome-like sedge Carex bromoides
brown beaksedge Rhynchospora fusca
brownfruit rush Juncus pelocarpus
brownish beaksedge Rhynchospora capitellata
brownish sedge Carex brunnescens
bulblet-bearing water hemlock Cicuta bulbifera
bushy knotweed Polygonum ramosissimum
Buxbaum's sedge Carex buxbaumii
Canada lettuce Lactuca canadensis
Canada lily Lilium canadense
Canada mayflower Maianthemum canadense
Canada toadflax Nuttallanthus canadensis
Carey's smartweed Polygonum careyi
Carolina springbeauty Claytonia caroliniana
catberry Ilex mucronata
checkered rattlesnake plantain Goodyera tesselata
Christmas fern Polystichum acrostichoides
claspingleaf pondweed Potamogeton perfoliatus
claspleaf twistedstalk Streptopus amplexifolius
Clayton's sweetroot Osmorhiza claytonii
clustered sedge Carex cumulata
coastal jointweed Polygonella articulata
coastal sedge Carex exilis
common bladderwort Utricularia macrorhiza
common boneset Eupatorium perfoliatum
common cinquefoil Potentilla simplex
common marsh bedstraw Galium palustre
common yellow oxalis Oxalis stricta
cranberry Vaccinium macrocarpon
Crawford's sedge Carex crawfordii
creeping sedge Carex chordorrhiza
curlytop knotweed Polygonum lapathifolium
cypress-like sedge Carex pseudocyperus
deeproot clubmoss Lycopodium tristachyum
densetuft hairsedge Bulbostylis capillaris
Dortmann's cardinalflower Lobelia dortmanna
downy goldenrod Solidago puberula
downy willowherb Epilobium strictum
dragon's mouth Arethusa bulbosa
drooping woodland sedge Carex arctata
dryspike sedge Carex siccata
dwarf red blackberry Rubus pubescens
early goldenrod Solidago juncea
early wildrye Elymus macgregorii
earth loosestrife Lysimachia terrestris
eastern blue-eyed grass Sisyrinchium atlanticum
eastern hayscented fern Dennstaedtia punctilobula
eastern hemlockparsley Conioselinum chinense
eastern leatherwood Dirca palustris
false melic Schizachne purpurascens
feathery false lily of the valley Maianthemum racemosum
fewflower sedge Carex pauciflora
fewnerved cottongrass Eriophorum tenellum
fewseed sedge Carex oligosperma
fibrousroot sedge Carex communis
fireberry hawthorn Crataegus chrysocarpa
flat-top goldentop Euthamia graminifolia
flatleaf bladderwort Utricularia intermedia
floating bur-reed Sparganium fluctuans
forked bluecurls Trichostema dichotomum
fragrant bedstraw Galium triflorum
fringed loosestrife Lysimachia ciliata
fringed willowherb Epilobium ciliatum
gall of the earth Prenanthes trifoliolata
grassy arrowhead Sagittaria graminea
greater purple fringed orchid Platanthera grandiflora
greater water dock Rumex orbiculatus
green adder's-mouth orchid Malaxis unifolia
green carpetweed Mollugo verticillata
green fringed orchid Platanthera lacera
Greene's rush Juncus greenei
greenflowered wintergreen Pyrola chlorantha
groundcedar Lycopodium complanatum
hairy Solomon's seal Polygonatum pubescens
hairy woodrush Luzula acuminata
hairystem gooseberry Ribes hirtellum
halberdleaf tearthumb Polygonum arifolium
harlequin blueflag Iris versicolor
hay sedge Carex argyrantha
Hayden's sedge Carex haydenii
heartleaf twayblade Listera cordata
hiddenfruit bladderwort Utricularia geminiscapa
hookedspur violet Viola adunca
Hooker's orchid Platanthera hookeri
horned bladderwort Utricularia cornuta
Howell's pussytoes Antennaria howellii
Indian cucumber Medeola virginiana
Indian-tobacco Lobelia inflata
Indianpipe Monotropa uniflora
inundated clubmoss Lycopodiella inundata
king of the meadow Thalictrum pubescens
knotsheath sedge Carex retrorsa
large St. Johnswort Hypericum majus
largepod pinweed Lechea intermedia
leathery grapefern Botrychium multifidum
lesser Canadian St. Johnswort Hypericum canadense
lesser purple fringed orchid Platanthera psycodes
lesser rattlesnake plantain Goodyera repens
lesser roundleaved orchid Platanthera orbiculata
limp mannagrass Glyceria laxa
Lindley's aster Symphyotrichum ciliolatum
little evening primrose Oenothera perennis
little floatingheart Nymphoides cordata
little grapefern Botrychium simplex
liverleaf wintergreen Pyrola asarifolia
long beechfern Phegopteris connectilis
longstalk sedge Carex pedunculata
low rough aster Eurybia radula
lowland yellow loosestrife Lysimachia hybrida
male fern Dryopteris filix-mas
marginal woodfern Dryopteris marginalis
marsh arrowgrass Triglochin palustris
marsh blue violet Viola cucullata
marsh pea Lathyrus palustris
marsh skullcap Scutellaria galericulata
marsh willowherb Epilobium palustre
Maryland sanicle Sanicula marilandica
matricary grapefern Botrychium matricariifolium
meadow willow Salix petiolaris
moccasin flower Cypripedium acaule
mountain woodsorrel Oxalis montana
naked miterwort Mitella nuda
narrowleaf bur-reed Sparganium angustifolium
narrowleaf cowwheat Melampyrum lineare
narrowpanicle rush Juncus brevicaudatus
neckweed Veronica peregrina
northeastern sedge Carex cryptolepis
northern adderstongue Ophioglossum pusillum
northern bog bedstraw Galium labradoricum
northern bugleweed Lycopus uniflorus
northern dewberry Rubus flagellaris
northern evening primrose Oenothera parviflora
northern long sedge Carex folliculata
northern panicgrass Dichanthelium boreale
northern selaginella Selaginella rupestris
northern shorthusk Brachyelytrum aristosum
northern slender lady's tresses Spiranthes lacera
northern water plantain Alisma triviale
Norwegian cinquefoil Potentilla norvegica
Oakes' evening primrose Oenothera oakesiana
Oakes' pondweed Potamogeton oakesianus
oldpasture bluegrass Poa saltuensis
openfield sedge Carex conoidea
painted trillium Trillium undulatum
pale false mannagrass Torreyochloa pallida
pale sedge Carex pallescens
pale St. Johnswort Hypericum ellipticum
palespike lobelia Lobelia spicata
parasol sedge Carex umbellata
parasol whitetop Doellingeria umbellata
Parlin's pussytoes Antennaria parlinii
partridgeberry Mitchella repens
Philadelphia panicgrass Panicum philadelphicum
pinesap Monotropa hypopitys
poverty oatgrass Danthonia spicata
purple chokeberry Aronia ×prunifolia
purple marshlocks Comarum palustre
purple milkwort Polygala sanguinea
purple pitcherplant Sarracenia purpurea
rabbit-tobacco Pseudognaphalium obtusifolium
rannoch-rush Scheuchzeria palustris
rare clubmoss Lycopodium obscurum
red baneberry Actaea rubra
red trillium Trillium erectum
rice button aster Symphyotrichum dumosum
robin runaway Dalibarda repens
rock polypody Polypodium virginianum
rough hawkweed Hieracium scabrum
roughleaf ricegrass Oryzopsis asperifolia
roundleaf sundew Drosera rotundifolia
running clubmoss Lycopodium clavatum
running serviceberry Amelanchier stolonifera
rusty woodsia Woodsia ilvensis
salt sandspurry Spergularia salina
saltmeadow rush Juncus gerardii
sand bittercress Cardamine parviflora
scaldweed Cuscuta gronovii
scentbottle Platanthera dilatata
seaside arrowgrass Triglochin maritima
seaside sandplant Honckenya peploides
seawrack Zostera marina
Selkirk's violet Viola selkirkii
sensitive fern Onoclea sensibilis
sessileleaf bellwort Uvularia sessilifolia
setose blackberry Rubus setosus
sevenangle pipewort Eriocaulon aquaticum
sheep laurel Kalmia angustifolia
shining clubmoss Huperzia lucidula
shortbeak sedge Carex brevior
shortspike watermilfoil Myriophyllum sibiricum
shrubby fivefingers Sibbaldiopsis tridentata
sidebells wintergreen Orthilia secunda
single delight Moneses uniflora
skullcap speedwell Veronica scutellata
skunk currant Ribes glandulosum
slender blue iris Iris prismatica
slender wedgescale Sphenopholis intermedia
small bur-reed Sparganium natans
small cranberry Vaccinium oxycoccos
small green wood orchid Platanthera clavellata
small pondweed Potamogeton pusillus
smallflower false foxglove Agalinis paupercula
smooth blackberry Rubus canadensis
smooth rose Rosa blanda
smooth sawgrass Cladium mariscoides
snakemouth orchid Pogonia ophioglossoides
spinulose woodfern Dryopteris carthusiana
spiral pondweed Potamogeton spirillus
spoonleaf sundew Drosera intermedia
spotted sandmat Chamaesyce maculata
spotted water hemlock Cicuta maculata
spreading dogbane Apocynum androsaemifolium
starflower Trientalis borealis
strict blue-eyed grass Sisyrinchium montanum
summer coralroot Corallorhiza maculata
swamp thistle Cirsium muticum
swamp verbena Verbena hastata
swaying bulrush Schoenoplectus subterminalis
sweet white violet Viola blanda
tall blue lettuce Lactuca biennis
tall rattlesnakeroot Prenanthes altissima
thinleaf cottonsedge Eriophorum viridicarinatum
threadleaf crowfoot Ranunculus trichophyllus
threeleaf false lily of the valley Maianthemum trifolium
threeleaf goldthread Coptis trifolia
toothed flatsedge Cyperus dentatus
Torrey's bulrush Schoenoplectus torreyi
trailing arbutus Epigaea repens
triangle orache Atriplex prostrata
tuberous grasspink Calopogon tuberosus
Tuckerman's sedge Carex tuckermanii
tussock cottongrass Eriophorum vaginatum
twinflower Linnaea borealis
twistedstalk Streptopus lanceolatus
variegated scouringrush Equisetum variegatum
Vasey's rush Juncus vaseyi
velvetleaf huckleberry Vaccinium myrtilloides
Viola ×primulifolia Viola ×primulifolia
Virginia chainfern Woodwardia virginica
Virginia marsh St. Johnswort Triadenum virginicum
Virginia pepperweed Lepidium virginicum
Virginia strawberry Fragaria virginiana
water arum Calla palustris
watershield Brasenia schreberi
wavyleaf aster Symphyotrichum undulatum
waxflower shinleaf Pyrola elliptica
western oakfern Gymnocarpium dryopteris
western poison ivy Toxicodendron rydbergii
whip-poor-will flower Trillium cernuum
white baneberry Actaea pachypoda
white beaksedge Rhynchospora alba
white goldenrod Solidago bicolor
white turtlehead Chelone glabra
white violet Viola renifolia
whitetinge sedge Carex albicans
whorl-leaf watermilfoil Myriophyllum verticillatum
whorled milkwort Polygala verticillata
whorled wood aster Oclemena acuminata
whorled yellow loosestrife Lysimachia quadrifolia
wild cucumber Echinocystis lobata
witchgrass Panicum capillare
woodland strawberry Fragaria vesca
woollyfruit sedge Carex lasiocarpa
yellow avens Geum aleppicum
yellow coralroot Corallorhiza trifida
yellow sedge Carex flava
yellow water buttercup Ranunculus flabellaris
yellow widelip orchid Liparis loeselii
yellowseed false pimpernel Lindernia dubia

Also listed as native and introduced here 5

PLANTS labels these species both native and introduced in this state: some forms are native and others were brought in from elsewhere. Most gardeners should choose plants from the main list.

American red raspberryRubus idaeus
annual ragweedAmbrosia artemisiifolia
hedge false bindweedCalystegia sepium
Kentucky bluegrassPoa pratensis
wood bluegrassPoa nemoralis

Compared with Maine

The typical county is the median of the 16 Maine counties with PLANTS county records; the statewide figure counts every species native anywhere in the state. More species is not better or worse: counties differ in size, habitat and how thoroughly they have been surveyed.

Native species counts, Washington County and Maine
Measure	Washington County	Typical county	Statewide
Native species	579	681	1,278
Garden-ready natives	270	303	510
Tree	60	—	112
Shrub	57	—	95
Wildflower (forb)	268	—	636
Grass or grass-like	149	—	326
Vine	12	—	33
Fern	33	—	76

Neighboring counties

Counties that share a ZIP code with Washington County.

Aroostook County, ME 296 garden-ready
Hancock County, ME 279 garden-ready

Source & data date

Source: USDA NRCS PLANTS Database: county distribution records, native status and plant characteristics. CC0 (public domain dedication, per the data.gov catalog record).; Kew’s World Checklist of Vascular Plants (WCVP): native or introduced status by state. CC BY 3.0.; USGS US-RIIS (ver. 2.0): species listed as introduced are excluded. CC0.
Citation: USDA, NRCS. 2026. The PLANTS Database (https://plants.usda.gov, 11/04/2026). National Plant Data Team, Greensboro, NC USA.; Govaerts R. (ed.) (2026). WCVP: World Checklist of Vascular Plants. Facilitated by the Royal Botanic Gardens, Kew. Data file dated 2026-06-04, http://sftp.kew.org/pub/data-repositories/WCVP/ (retrieved 2026-11-04). Paper: Govaerts R. et al. (2021) The World Checklist of Vascular Plants, a continuously updated resource for exploring global plant diversity. Scientific Data 8, 215.
Data date: Retrieved from PLANTS on November 4, 2026; WCVP data file dated June 4, 2026.
Zones: USDA Plant Hardiness Zone Map (2023) ZIP table: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 3, 2026. Plant zones on this site are our estimate, not the official map.
Scope: Washington County (county FIPS 23029), Maine. 579 native species from PLANTS county distribution records; garden-ready = species with a PLANTS characteristics record.
Method: A species is listed when it is recorded as native to the state in Kew’s World Checklist of Vascular Plants and USDA PLANTS, and recorded in the county by USDA PLANTS. Species PLANTS labels both native and introduced are listed separately. Full method · All sources

Independent reference site. No government affiliation or endorsement.