I had big probs with aphids, I think year before last(maybe). Our garden was mainly full of grasses with very few flowers. Since I started growing more flowers I've seen more ladybirds and the aphid problem is no more(touch wood). I wouldn't bother buying them in, they'll just fly off once they've feasted. Like chilliking sez, build them a home and grow some flowers in pots if you don't have a garden. I tied a few canes together and hung on the fence. I actually had one sleeping in one over winter. I might make one of those towers though this year, they look pretty good

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