Here are some easy tips that we follow and recommend related to caring for perennials and ornamental grasses.
Cut back perennials and grasses so that they will regenerate bigger and better than before. For perennials, cut them back to about 2″ above the ground. For woody perennials,such as Russian Sage, some of the old growth will often begin to leaf out and you can leave more of the existing plant to re-grow.
When cutting back ornamental grasses, a rule of thumb that I like to use is to cut them back to 1/5th (or 20%) of their maximum height. Feather Reed Grass, for example, grows to a height of 4-5′, so you would cut them back to 10-12″ height.
You can begin to “divide and conquer”! Divide up fall-blooming perennials and grasses and transplant them throughout the landscape- This gives them time to grow this season, so that in the late summer you will have new plants to enjoy.
Remove excess mulch and leaf scraps from around the bases of plants, along with any extra mulch that was placed around plants to protect them over the winter. Spring is the wettest time of the year, and the mulch is needed the least at this time. Leaving excess organic material around the bases of plants in spring can cause root rot, mold, and insect damage.