Hello everyone
it's week 7 of my second grow, Blue Dream auto-flower, 2x2 tent, MAXISUN PB2000 at 50% on 18/6, 5 gallon pots, 70 degrees, 50% humidity, PH unknown as i don't have the meter yet but i use filtered drinking water. i have 3 plants, all in same environment, same watering habit but the leaves of one of them which is actually a bit taller than the other two, has become downwards as seen in the picture (back left).
i know it may be due to several reasons but as per your experience, what is the usual cause? Thank you in advance. Piece.

Under-watered?
Im new to this but I think it is over watering. The leaves are full of water and its causing them to droop. The " speed bumps " or rough texture of the leaves is another symtom of too much water.
Only lower Leaves drooping I belive is a sign of the plant being thirsty.
In Week 7 my girls in 5 gal fbric pots would drink about a gallon of water and I would water when the lower leaves first started to droop ( about 5 days )
P.S. PH is important. I started off with a $12 amazon yelllow model that turned out to be off by 1.5 points causing major headaches and setbacks.
Hope this helps, happy growing.
P.S.S. I heard somewhere filtered water also removes good minerals the plant needs.
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