It is recommended to prune your peonies in the fall before winter and to remove all plant debris.
According to Pangborn, peonies are prone to foliar fungal problems. If sick foliage is left on the plant during the winter, it may expose new growth to diseases that have overwintered on the old leaves and caused damage.
Peonies should be pruned before winter to keep your garden organized. Green claims that if you don’t cut them, the leaves and stems would rot, turn to mush, and eventually tumble to the ground.
What occurs if you prune peonies too soon?
The flowers the following year can suffer if they are cut down too soon. The leaves of pedunculates is prone to fungi like powdery mildew (shown here). Your peony won’t die, but it doesn’t look good. This plant was put in a partially shaded area.
Can peony be pruned after blooming?
When peonies and Stella d’Oro lilies have finished blooming, may they be trimmed down? What kind of flower should I place there instead when the peonies have finished blooming?
The dead peony blossoms can be removed, but the foliage should remain in tact. To prepare the blossoms for the following year, the plant needs all of its leaves. When a cycle of blooming is finished, you can do the same with Stella d’Oro by cutting off the flower stems. But avoid trimming the foliage.
You might think about growing a clematis beside the peonies. The clematis can use the peony’s foliage as support as it climbs up and blooms in the same spot later in the year.