Anthriscus sylvestris a wild hardy perennial that forms the tall white frothy masses seen along the road sides in May.
It also has a beautiful fern-like leaf very early in the year. Provides nectar for beneficial insects like hoverflies that eat aphids.
Looks great with grasses, poppies, cornflowers etc. in a wildflower meadow, and tolerates dappled shade.
Sow in autumn or spring in seedtrays and pot on til good sized plug plants before planting out.