We are overwhelmed with regular blackberries here... They are trying to swallow our entire 5 acre property. I think perhaps I heard the thornless variety is much less aggressive? I'll have to look that up, too.Lol! Totally! We have blue berries on the property to, and they seem to grow pretty well. I didn't see any info on blueberry leaves being harmful, but I didn't look that hard. Haha! Someone else suggested thornless Blackberry, but I feel like that would over grown REALLY quickly! Its invasive were I am to, and removing it would be tough.