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Wilting petunia flowers can also be a sign of too much water. Always check the soil around your petunias before watering – if the soil is still damp, don't water it. Lack of sun can also lead to the wilting of petunias. Petunias prefer full sun and will produce the most flowers if they get it.
In this way, how do you revive a dying petunia plant?
Examine the foliage of your petunia plants. If the leaves are limp and wilted, but remain green and pliable, watering may be all that is needed to revive them. Water them thoroughly until water runs freely through the bottom of the pot or, in the ground, until the soil is well soaked.
Similarly, why are my petunia hanging baskets dying?
Water a Wave petunia only when the soil feels dry to the touch. You may be over- or underwatering your plant, causing the leaves to die back. Container and hanging basket plants dry out more quickly than garden plants, but how quickly varies depending on light, wind and air temperature.
Petunias are subject to root and crown rot, a result of uneven watering. “Like pansies,” she says, “petunias must never be allowed to wilt, either from under- or overwatering. Once they wilt, it's all over.” She advises providing good soil conditions, including preparation with organic materials and ample mulching.