Are you using straight coco fiber?
Do they dry in between watering?
What type of light do you have?
How warm is the room?

Usually yellowing is from ph that is do to overwatering.
Sparrow Reviewed by Sparrow on . Can Anyone HELP My Crop ? (Pic's Included) This is my first crop. These 3 plants were planted all at the same time and up until a week ago, were all growing at the same rate. Now for the past week the larger one has grown enormously but the other 2 have not grown at all. They have started to turn a bit yellowish and the leaves are very loose and flimsy. Sum1 mentioned that they may be over stretched ??? i don't know how to stop them from stretching ??? If anyone can help me i'd be very grateful. Thanks Bob Rating: 5