Any home remedies?
Holes in Blossoms of Petunias
Certified GKH Gardening Expert
Without knowing the cause it is difficult to propose a remedy. However, the likely cause is probably an insect. I would inspect your petunias thoroughly for insects. Here are articles that will link you to potential culprits and remedies:
It could be a tobacco budworm (the article focuses on roses, but they do infest petunias):