From WSU –
With its sculptured leaves and bold flower stalks, Bear’s Breeches is a stately addition to the flower bed. As it is often used in artistic paintings, this species may also be known in the trade as Artist’s Acanthus.
Morphology:
Bear’s Breeches is an herbaceous groundcover with large shiny dark green leaves. Mature plants can grow to a height of 5’ and equally as wide. The leaves themselves can attain width of up to 3’ with deep undulations. Lobes on the leaves each have a spine, which are not sharp. This species is classified as a groundcover in that any pieces of root cut from the original plant can easily contribute to further plant spread.
In late summer, Bear’s Breeches send up tall flower stalks which bear creamy white to slightly pink or purplish flowers.
Adaptation:
Generally adaptable to a wide array of sites, but it prefers ones which are slightly moist, highly organic, and acidic. Light to moderate shade is best. In warmer climates, outside of the Pacific Northwest, this plant has been considered invasive.