They probably need water. After the blooms die, pinch them off, and you'll get more blooms. Put the pinched off blooms back in the pot.
My petunias are getting brown leaves. Why?
dont let them dry out too much that is why they turn brown to keep plant from drying up frist the leaves dry up then goes the flowers
Reply:They need WATER
Reply:Poor petunias need water desperately. Are they in small pots or hanging pots? If so, they dry out very quickly and need attention daily as far as watering goes. Good luck!