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a few of my plants have yellow/brown spots on the leaves, and a bunch of tiny tiny black dots all over the underside of the leaves. they are about 5 weeks old. i assumed the yellow spots was a nute issue, now i am thinking maybe a pest. what is a good, doesn't-hurt-your-plants- pesticide? thanks

The walls in my closet are white, but i put up full walls of aluminum foil (dull-side) for better reflection. should i have just stuck with the white walls? the closet is about 7' x 2'... 1 400watt MH light hanging 3 feet above plants. i understand that using the shiny side of the foil might...

i mixed about 1/4 cup lime into my soil last week when i watered my month old plants, and the ph test today came up a 5! Is sphagnum peat moss that acidic? should i add more lime or something else? thanks!

hey everyone, i'm having problems with my 1 week-olds and my 1-month old plants. There are yellow spots forming on a couple of the 1 weeks, and the same with the month old plants but they also have browning/drying around the leaf edges on top leaves. I gave the month olds 1 tbsp of 5-10-5...