Ask the Master Gardener: Adding ornamental grasses and more Recommendations for grasses that do well in the lakes area, tips on annuals and perennials, restoring winter-killed grass and how to add a pop of chartreuse to a perennial bed are all part of this week's questions with the master gardeners. Written By: Jennifer Knutson | U of M Extension Master Gardener | 8:00 am, May 8, 2021 × Korean feather reed grass (Calamagrostis brachytricha) is a warm season grass that is hardy to zone 4. Submitted photo Dear Master Gardener: I would like to add a tall ornamental grass to my landscape. What do you recommend for this area?