I wouldn't give a crap if my tenant grew, except that I pay his electric and on top of that I would require him to carry personal liability insurance.
Legally, we have a rental agreement, and he lives in a different unit than I, so I can't lose my house for something he did.
But a kid's grow can jeopardize the parents' insurance policy, at the very least.
So just ask, and if not, stick to outdoors.