yellow spots

Discussion in 'Growing Marijuana Indoors' started by merle snider, Mar 22, 2004.

  1. I have yellow spots on some of my leaves. What is it and can you help.
  2. spots or just turning yelow?
    how old is the plant?
    what light source is it under?
    is it going yellow from the tip back, or the edge in etc

    as much info as possible, and a pic also speaks a thousand words........Peace out........Sid
  3. Sid, the leaves are turning yellow from the tips back and the plants are two months old. I have them under a 400w hps. Idont have a camera yet but i am working on it. The light is about 5 inches from the plants.
  4. most likely heat stress, a good way to roughly judge the distance to the plant would be 3-4" per 100 watts of light hence it may be better to have it at 12-16" from the tops of the plants........were the top leaves worse than the lower ones? you have a fan blowing across the plants, to help reduce the heat from the lamp........amd what's the room temp?........Peace out.........Sid
  5. I just looked st the leavrs and the bottom ones are the worst, room temp is 80 and the fan is on .I fert once a week and water every 4 days.

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