Cow parsnip is a widespread bold perennial;that can be found around western North America. Its a familiar large plant of the west side of the Cascades where it can be found in just about every biome in cool moist soil. This and other members of this genus have sap that can cause a rash, avoid exposure to skin. Larger in rich conditions it can exceed 6′ tall with ample moisture The leaves become enormous up to 18″ in favorable conditions. Adapted to clay soils as well and this large perennial is common under the drip zone in the shade of oaks in the Willamette Valley. The plant erupts out of the ground in very early spring and then extends to reveal large (6″) wide pure white umbels of flowers. Best to place this native away from paths, It is a integral pollinator perennial as well as food source for butterflies. Long lived deep rooted perennial. Goes deciduous with true heat and can leave a candelabra of dead stems through winter Very competitive with invasive grasses. Blooms May-July. Associated plants are Quercus garryana, Fraxinus latifolius, Viburnum ellipticum, Delphinium trollifolium. Oregon native plant.
