Maidenhair grass (Miscanthus), for example, is a more likely flopper than feather reed grass (Calamagrostis). ... End of winter is an ideal time to dig and divide ornamental grasses. By mid-winter, ornamental grasses have gone completely dormant. But as Roger explained when pots are frozen and not covered they hold water on top of the soil because it is frozen and that water will rot the crown of the grass. Cool-season grasses include feather reed grasses (Calamagrostis spp.) Divide warm-season grasses in late winter and cool-season grasses in early fall. If you prefer a tidy garden, or if your ornamental grass is a variety that doesn't look great dormant, cut back the grass in fall. Karl Foerster feather reed grass (Calamagrostis x acutifolia ‘Karl Foerster) is the most common ornamental grass planted in Colorado landscapes. However, many grasses add terrific winter interest in the landscape, adding movement and texture when much of the garden is asleep. We are in Zone 3 ... Q. Feather Reed Grass - I planted a Feather Reed Grass four seasons ago and it has done wonderful with full heads. Karl foerster are very easy to prune, much easier in […] and northern sea oats (Chasmanthium latifolium). February is a good time to cut Hair Grass back to a height of 3 inches. Since it’s so common, it’s helpful to know how to care for Karl Foerster feather reed grass. The dead stalks are attractive and add interest to your landscape if left over winter time. Free from serious disease and insect pests, this cool-season grass stays healthiest where air circulates freely. You’ll see some new ones starting soon! Plus, Feather Reed Grass is super winter hardy, and requires almost no care. It’s upright, tidy form and blonde seedheads make it a very popular plant. It’s also used very effectively in large containers on patios and terraces. Wondering if I should cut back reed grass before winter. Warm season grasses turn brown in winter. Pruning Karl foerster feather reed grass should be left until late spring. Believe it or not, wintertime is a perfect time for ornamental grass care! Karl Foerster Feather Reed Grass are a very attractive ornamental grass that grows very well in Calgary. Not only is it easy to do, cutting back in the winter lets you get a head start before the onslaught of spring landscaping and garden chores hit hard. Warm-season grasses begin growing in the spring and are dormant over winter. When they do freeze they stay frozen longer and are not constantly going through the freeze/thaw cycle that they would uncovered in a mild winter. Which to prune differently: Stipa gigantea or giant pheasant’s tail grass just needs its dead flower stalks removed in winter. Feather Reed Grass at Mather Commerce Center Tufted Hair Grass (Deschampsia cespitosa) is grown for it’s flower plumes, which should be attractive into the Winter. Cut back in late winter or spring before new growth emerges. 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