Muddy
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I see several potential issues with your plan, some of which have already been mentioned. First, 1 square foot per plant won't be enough. At least 15" if not 18" per plant. Second, I would not amend that soil with anything else, especially vermiculite. Vermiculite holds moisture and under low heat lights like LEDs and CFLs you may find your soil isn't drying out fast enough. Remember, autos like to go through wet/dry cycles and the added vermiculite could keep the soil too moist. Third, shoot for a soil pH of 6.3 - 6.5. At 5.8 - 6.0 you will likely run into cal/mag issues at the least. Should it drop any lower you could experience nutrient lockout where the nutrients are unavailable to the plants. Fourth, that soil would be considered a "hot" mix since it already contains amendments like worm castings and guano. Auto seedlings do not like hot mixes. I would highly recommend either starting them in a soil less medium and transplanting, start them in 32 or 44 oz. cups and do a tiered planting, or hollow out a space in the middle of the pot and fill it with a soil less medium so the seedlings can start in it and then grow out into the hot mix. Also, eliminate the 2 days of total darkness at the end. It's a myth and won't accomplish anything.


