Calamagrostis acutiflora ‘Karl Foerster’
Ornamental grasses come into their glory each autumn, shimmering in the golden rays of afternoon light, swaying in the gentlest breezes, and lending a strong vertical backdrop to soft drifts of colorful asters and sedums. One of the first tall grasses to bloom is ‘Karl Foerster’ Feather Reed Grass, Calamagrostis acutiflora ‘Karl Foerster’.
This standout grass, which was the 2001 Perennial Plant of the Year, forms gradually expanding clumps 3-4 feet tall. It tolerates a wide range of conditions from zones 3 to 9 and is happiest in full sun, in moist to wet fertile soil. It thrives in clay soil, but will grow in dry sandy soils as well. It has no serious pest nor disease problems. I’ve never seen it become invasive and the seeds are sterile so it won’t self-seed. That’s important because out-of-control grasses can quickly take over.