Petunia Flower Dying. Jan 29 2016 Petunia flowers once pollinated begin to wilt and die within 24 to 36 hours. Wave petunias are heavy feeders that require sufficient nutrients to produce blooms throughout the season.
If you plant doest get enough sunlight it wont thrive and the stems will become weak. Ethylene production in the flower increases within 12 hours of pollination followed by premature death. Mites are nearly microscopic pests that suck the juices directly out of petunia cells.
These pests are controlled by spraying the plants with an insecticidal soap spray.
Young leaves on sulfur-deprived plants are decidedly greenish-yellow. Overwatering not enough sun and a lack of nutrients can all cause petunia leaves to turn yellow and die back. I wiggle it to make holes throughout now solid chunk of soil. May 28 2012 Viral diseases can cause flowers to be streaked discolored and deformed.