If they are the petunias called supertunia, that has tons of flowers, I have found that they are forced so early and probably are fed huge amounts of fertilizer that they kind of tire themselves out. I would try to give them a real hard cut back. All they need may be a rest. There's plenty of time for them to come back. Let's hope we get some sun!
By
06/08/2009
I know with morning glories if they don't bloom, you're supposed to stop watering for a bit. Maybe try that.
By
06/08/2009
Could be the spent blooms were not pinched off. This helps to keep them blooming all season. Keep them watered too.