Yellowing leaves moving up the plant: tomorrow is day 22 of flower

[Greenlizard]

A flush might help you out since you didn't flush the grow nutes out before switching to the bloom nutes. You might have a buildup locking out some elements. A flush won't hurt. 5x the pot volume is correct. That will provide a real good rinse of all the built up salts. The ph of the water you flush with isn't important. Once the flush is complete you must ph the final feed when you apply that though.

 

[JKB1989]

I was told that I didnt need to worry about ph with advanced nutrients

 

[JKB1989]

I have no idea what my ph is? Never checked

 

[JKB1989]

Update..... the flush worked. The plants are back to that wonderful deep green color......

 

[bobrown14]

Your yellow leaves turned back to green?

 

[JKB1989]

Well actually the leaves at the bottom of the plant were to far gone. The leaves going up the plant the plant that started to show the same symptoms turned back to a nice green color. Must have caught them before to much damage was done.