Q.holes in blossoms of petunias
Any home remedies?
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):
https://www.gardeningknowhow.com/ornamental/flowers/roses/budworms-roses.htm
Earwigs:
https://www.gardeningknowhow.com/plant-problems/pests/insects/removing-earwigs-garden.htm
Snails & Slugs:
https://www.gardeningknowhow.com/plant-problems/pests/insects/organic-snail-control.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/kill-garden-slugs.htm