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You will quickly end up with 15 of them. Seriously, just having one is boring. It dosen't take that much of your time so if you wanna be like mr.Miyagi you'll end up growing quite a few. Also consider that most species require a decent amount of light. I never had outdoors ones so I can't help you with that. I'm kind of a newfag to bonsais anyways, but after 1 year I think it's fun.