This is the perfect kind of day to be dividing perennials. It's cloudy and overcast, so you won't stress out the plants. Joining me is master gardener, Ann Munson. You said, in general, you prefer spring to divide perennials.
Spring is an excellent time to divide perennials.
The weather's cool and plants are growing vigorously. If you try it in the fall sometimes your plants don't make it through the winter. You've already started some of these. You've got this massive ball of aster, here. And you said that this shows us a very good reason of why we should divide perennials.