I'm waiting for my ladybug order to arrive today. I hope they didn't freeze.
As soon as things warm up in the spring, I never have aphid problems outside. Its only in the winter when there is a lack of predators. Ladybugs don't like going inside my greenhouse. Once they are in there they are ok but I usually have to take plants out of the greenhouse for a few days for the ladybugs to find them. The damn aphids are born pregnant too so you have to try to get them all or things can get out of control quickly