High in the running for our most commonly recommended plant, specifically as a replacement for traditional lawns. Fragaria virginiana is a low-growing, fast-spreading native perennial strawberry whose vigor makes it poorly suited for planting among delicate species but makes it great for covering ground and dealing with the sort of abuses that a lawn must put up with (ie. crappy soils and foot traffic). This species supports more native lepidoptera than any other herbaceous genus with the one exception of goldenrods (Solidago). White flowers bloom in spring and fruits appear in the early to mid-summer, very tasty.