Petunias and pests
I live in New Hampshire where I've had good luck with petunias, for the most part. The primary issue being the pernicious moth/caterpillars that eventually get into them. That is, despite my using Bayer pesticide (which works mostly).
A spray pesticide had no effect, other than making me nauseous (won't do that again).
I'm wondering what else I can do to toughen these up and avoid those infestations. Perhaps my mistake was in using the pesticide later in the growing season?
Is there anything else I can do.