what kind of air flow you have. ya that is heat stresss big time...I am growing this in my attic where it has been hitting over a 100 degrees. Could this yellowing be a result of the heat?
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freash air in and exhaust out and you will be fine.. you will have to play with fan speeds to control the heat..Just a fan. I am going to build an open top tent with an exhaust fan pulling air in and an oscillating fan directed at the plants. I wish I didnt wait until the hottest part of the year to plant.