hmmm, 13 was a good answer ... while I have frequently had 'mixed grows', I almost always regretted it ... just my luck, but seemed like I could never have enough similarities in them, to not cause minor adjustments later ... height differences are the primary hassle, but are easily overcome ... sometimes, there can be nute differences, that are more of a bother ... my White Widow didn't like being fed much, while my others were little pigs ... so, I wound up with about 3 different nutes mixes for 5 plants .... other than those minor irritations, you're good to go :jointsmile: