When you bring them indoors you may encounter a couple of issues.

a) any plant grown outdoors has mold and mildew spors. you may devlop Powdery Mildew or especially bud rot (does not require buds) more easily.

b) you will be bringing in any pests from outside. outdoors pests have their own pests. you bring them in you're putting them in a "controlled" environment possibly without nature's balancers. anyway, you might have pest problems.


above from experience.