Most containers don’t have enough soil volume to insulate perennial roots from freezing when winter temperatures drop. Two or three weeks prior to freeze-up, transplant into the garden any perennials growing in all but large containers.
Perennial flowers and plants have few maintenance needs and provide beauty in your garden for years. In cold climates (north of zone 6), perennials need winter protection, especially if you live in an area with repeated freeze and thaw cycles. Don't cut perennials back until late winter. The dead stalks provide shelter and food for birds, as well as insulation for the perennials' roots.
A perennial with winter interest must have persistent foliage and may have unusual color, particularly interesting growth pattern or texture that is unusual or colorful. Seeds and seedpods often offer unusual and attractive characteristics to the winter scene.
How to Prepare Perennials for Winter. Good winter care of perennials will help plants survive the cold season and be ready to grow and bloom in spring.
Past Articles Library | Perennials | 12 Perennials for Winter Interest