Sorry I did not see your question earlier when it would have been better to clip them back. Since it is getting close to their flowering time, you may want to wait and chop them next year in late May or June, but definitely before July 4th. It will encourage branching and give you more flowers. You can try cutting a few stems now just to see if they have enough time in your area to rebound with new growth and flower before cold weather sets in.
Hi Carol,
Sorry I did not see your question earlier when it would have been better to clip them back. Since it is getting close to their flowering time, you may want to wait and chop them next year in late May or June, but definitely before July 4th. It will encourage branching and give you more flowers. You can try cutting a few stems now just to see if they have enough time in your area to rebound with new growth and flower before cold weather sets in.