Perennial Plants & Flowers
Why leave perennial plants & flowers standing over winter months? Like ornamental grasses, it's a good idea to leave perennials standing as well. These plants will often provide the same shelter to beneficial insects as the ornamental grasses.
Seed bearing perennials such as Purple Coneflower (Echinacea), Joe Pye Weed (Eupatorium), Hummingbird Mint (Agastache), Lavender (Lavandula), perennial Sunflower (Helianthus), and others, also provide valuable winter food for songbirds. Additionally, species with stiff stems and ornamental seed heads, such as Yarrow (Achillea), Purple Coneflower (Echinacea), Tall Stonecrop (Sedum), and others with flat or cone-shaped dried flowers, add to the garden's winter beauty.
Plus, perennials are more cold hardy when their stems are left standing over the winter. This is helpful for overwintering perennials that are living at the edge of their cold hardiness zones. For example, when native Sage (Salvia), Hummingbird Mint (Agastache), and Hummingbird Trumpet (Zauschneria) are planted in USDA zones 5 & 6, this will help them survive the winter cold. This is especially true for young plants (in the ground one to two growing seasons).
- Wait until mid-spring to cut back perennials.
- If perennial plants are exhibiting some summer/fall disease or are infested with injurious insects, then in these instances, these damaged plants should be cut back, and scraps thrown away in the trash, not the compost, to prevent the disease or pests from spreading.
- Learn More: Perennial Plant Care In Seasons 1 & 2