So if you want a sativa auto, look at something like Durban poison, Sour diesel, or some of the hazes, they do well in higher humidity areas, and you want your grow medium to be light and airy, so the roots can pass better, I use promix bx for my autos, downside there's no nutrients except for a rooting fungus in it called mychorhaze, so you'll have to feed the plants, i use advanced nutrients. Sensi grow a & b, and big bud, and overdrive to finish.. it is on rhe pricy side but it gives results and lasts a bunchbof grows..
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