My first auto grow went some 16 weeks for 2 seeds and another flowered at like week 3 and was a dwarf plant done at half the time and I kept light at 18-6. Just couldn’t get enough of amber trichomes. Multiple Autos are difficult to control indoors from my experience. So many phenos with just two genetics I’ve seen and speeds of growth.
Point being autos are crazy bitches who do what they want. Rn I have 6 autos and a runt going under in Mars 3000 inside 6x6 tent. Day 50ish and a couple much faster and 2 much slower.
Tie this back to your post….should autos flip to 12/12
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Check soil with slurry before each feeding and match the water with soil numbers.