Native Plants for Washington, D.C.

Washington sits where the Piedmont drops to the Atlantic Coastal Plain, and the boundary runs through the city itself. Rock Creek and the northwest neighborhoods are on Piedmont ground: rockier, with clay soils and steeper terrain. Southeast and along the Anacostia, the coastal plain begins, sandier and flatter.

The fall line is why the city is where it is, since it marks the head of navigation on the Potomac, and it is also why two gardens a few miles apart can have quite different soil.

Urban conditions are the real constraint

For most gardeners here the limiting factors are not regional at all. They are compacted soil, restricted root space, reflected heat from pavement and buildings, shade cast by structures rather than trees, and rainfall that runs off hard surfaces instead of soaking in.

The urban heat island raises winter minimums noticeably above the surrounding counties, which widens the plant list at the warm end. It also intensifies summer, and a small city garden surrounded by brick can be brutally hot in July.

Tough, adaptable natives handle this best. Little bluestem, switchgrass, wild bergamot, black-eyed Susan, and the asters and goldenrods tolerate compacted, hot, dry ground. For shade between buildings, wild ginger, sedges, foamflower, and the woodland ferns do well.

Stormwater is a civic issue here

The District's combined sewer system means heavy rain can send untreated overflow into the Anacostia and Potomac, and the city actively encourages plantings that capture runoff. A rain garden in a low corner, planted with species that tolerate alternating flooding and drought, does real work.

Wet-tolerant natives for those spots include cardinal flower, blue flag, swamp milkweed, joe-pye weed, and the soft rushes and sedges.

Timing and small-space choices

Fall planting is the better window, with a long mild autumn giving roots months before summer arrives.

In small gardens, choose clump-forming species over spreaders. Common milkweed and Canada goldenrod are excellent plants in a meadow and a nuisance in a twelve foot bed; swamp milkweed and showy goldenrod give the same wildlife value while staying put.

Confirming what is native to your area

The Maryland Native Plant Society and Virginia Native Plant Society both cover the immediate region, and their guidance applies across the District line. The U.S. Botanic Garden and the Smithsonian Gardens maintain native plantings in the city worth visiting to see mature specimens. Casey Trees publishes guidance specific to planting in Washington's conditions.

Sources: U.S. Fish and Wildlife Service, Chesapeake Bay Field Office (native plants for the Chesapeake watershed); District Department of Energy and Environment (stormwater and landscaping guidance); USDA PLANTS Database (native status by state).