as plant finishes, the lack of nitrogen available in your solution causes the leaves to yellow. if you are close to harvest, this means that your plant is using stored nitrogen available from the leaves...thus they yellow.

p.s. you should use nutrients as directed for better results. peace
latewood Reviewed by latewood on . ATTENTION GH's "FloraShield" users..... If you use Florashield by GH as prescribed in their charts like their "phase feeding cart" or "weekly feeding chart", it says to use 37.5 ml. per U.S. gallon of reservoir at every reservoir change. What they don't tell ya' is what the stuff does exactly, and what exactly it contains. THey don't tell ya' that 37.5 ml./gal is NOT for every gallon of every resevoir change, and that it is only intended for specific needs like a root rot problem, or bacterial infection. They make it look Rating: 5