Answer: There are a few perennials that should be planted in the fall, such as peony and Siberian iris. But in general, both times are good times to plant. In your area, fall is especially good because the mild weather lasts for months and gives the plants lots of time to become well rooted before winter. Then they have a little more time to establish further in the spring before the stress of summer heat hits. The other consideration is whether or not the plants you want are available -- sometimes the selection is better in the spring. You also want to avoid plants that have been stressed by growing in pots all summer under poor conditions or have become terribly rootbound.
Q&A Library Searching Tips