Sorry no pics. T-44. 1st grow, from seed. 5 weeks from germ. 4 plants. 2 plants have brown spots on leaves. others leaves are turning light green veins are dark green. soil is 50% pro mix, 25% perlite and 25% vermiculite in 5 gal pots. Gave 1/4 strength nutes last watering ( 1st time for nutes, FF big grow). Using Super Thrive every watering. Thought it might be a Mag dif from what I have read and some of the pics I have seen here looked like my problem so this watering I used Cal/Mag. Lights are 200w CFL 18/6. PH is 6.6. Any input would be great.

sounds like either a mag deficiency or a calcium deficiency...i'm having this problem right now and i have an entire thread on it...i'll post the thread in here when i put some new pictures up today.

try foliar feeding with epsom salt. 1/2 tsp to a quart of water. seems like it helped out my crop so far.


oh, and have you checked your soil PH?

i'm using pro-mix too, and turns out the peat moss is quite acidic....may want to add dolomite

I'm Thinking Mag Def.


i'm gonna post new pictures of the plants up today...mine are 2 weeks and 1 day old.