
Certified GKH Gardening Expert
This depends on the cultivar, but they will usually bloom by this time if they were deadheaded as soon as flowering stopped the first time around. If it is not blooming by now in your area, you may not see a second bloom this year.
Unfortunately, there will be too many plants to list here, but this article will give you a good idea of what plants will do well in zone 6:
https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-6/plants-for-zone-6.htm