The cooler weather of September and October causes renewed root growth and, in some cases, top growth. Both better enable perennials to survive the ensuing winter. Don't wait too long, however, since ...
and then flower in the spring. While the ideal planting time varies between September and November, many seasoned gardeners will have already started planting their first batches of the year.
“On a peony you can see on the root crown ... plants and leave you with less topsoil in the spring. “When plants aren’t actually growing and pulling up moisture, we see a lot more saturated ...