Originally Posted by rollitup Before we get into this I want you to check a couple things, check the following things: Plants have plenty of waterSoil is seven PH or even a little lessYour light cycles are correctNo pools of waterConstant fresh airNow thats out of the way let Mr. Ganja God diagnose your plant Bigger leaves are turning a yellowish color while the smaller leaves are green. Nitrogen deficiency - add nitrate of soda or organic fertilizer.Older leaves will curl at ...