Why are my plants not growing?

You look like your having a nitrogen deficiency, A cannabis nitrogen deficiency will cause the older, lower leaves on your plant to turn yellow, wilt away and eventually die. The plant typically appears pale or lime-colored. if that’s an auto she won’t get much taller but your bid development will improve. Another week or so she will want more phosphorus. Hope that helps

It’s won’t get any bigger now my friend. Only the buds will fatten our. It’s past it’s preflower stretch. I’ve had a few autos do this to me. This is why I’m back doing photoperiods. No small plants anymore. The reason they do this can be a number of reasons. High/low temp stress, hot soil, lights to close etc. If you want a good size plant with lots of nice fat buds rather than risking early flower, go with photos mate. Then, pop a few autos to fill space. Best of both worlds. :)

this plant is 5 and a half weeks old