Aphids and Petunias

Question

I grow plants on a terrace with an overhang in an apartment building on 8th floor. I like to plant petunias in flower boxes, but every year they get infested with aphids and white flies. I buy the plants from different sources and I use good fresh soil each spring. What can I do to prevent these pests from coming? How can I get beneficial bugs to eat them? Can one buy the bugs?

Answer 1

The following articles should be of some help to you: https://www.gardeningknowhow.com/plant-problems/pests/getting-rid-of-bad-bugs-with-beneficial-insects.htm
https://www.gardeningknowhow.com/plant-problems/pests/homemade-aphid-control-a-natural-way-to-kill-aphids.htm