First grow, spots in leaves, and purple stems

Discussion in 'First Time Marijuana Growers' started by mro1322, Aug 9, 2017.

  1. 1502232077334152142372.jpg 1502232047686-553798462.jpg 1502232565016-1997694422.jpg Hi everyone, I'm currently 6 weeks into my first grow and, as you can see in the pictures, I've run into a hopefully minor problem. Each of my 3 plants have begun to develop these brown/tan spots and purple stems. I've been looking around to see if I could figure out what's going on and so far I believe it may be a ph problem or possibly a cal-mag defiency, due to the organic soil.

    The following is my current grow setup: 4x4x7 tent, 400 watt MH, 240cfm exhaust, 2 oscillating fans, 3.5 gallon medium, and plants are in a 60/40 soil mix of fox farm ocean forest and Coco pearl.

    Any help is greatly appreciated.

    Attached Files:

  2. Purple stem and yellow leaves means she need nitrogen. Tje spots may be because of over humidity, over dose nutrients or light burn.

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  3. Light burn? Is that caused by too much heat from the light or too many lumens?

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  4. It's enough big for 400watt but if the light so near to plant leaves may be burn bcuz of heat

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  5. I see, I raised my lights a couple inches and moved one of my fans to blow air on top of the canopy and a bit above to try and dissipate some of the heat. I still have to resolve the nitrogen deficiency though.

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