need some help please. My plants look very good on top but underneath they are dying!!!!!!!!!! My ph is 5.9 and ppm is 1000, using air stones with air pump and 2 inch fan to move air around my cabin.
Its not unusual for the lower leaves to die off if the light is being blocked by the canopy. Could be that??
I agree the undergrowth does normally start to die of slightly in flower. But 3 weeks in seems a bit early for this to happen ( I may be wrong) so I'll put it down to your dense canopy. Sorry I couldn't be much help