myGardenAnswers: KARL FOERSTER (calamagrostis x acutiflora) Easily grown in average, medium to wet soil in full sun. Does well in heavy clay soils, unlike many of the other ornamental grasses. Like most ornamental grasses cut clumps to the ground in late winter just before the new shoots appear. Brought to you by myGardenAnswers. Now available in the app store.