This reaccuring problem has been with me for the last 3 grows,ive been able to finish except for the last grow which killed all plants at about week 5 of flower.no problems seen untill about week 3 or 4 then it comes on quick.White widow grown in rockwool ,ebb and flow,ph i keep at 5.6 however checking runoff for the first time ph was 7 in rockwool ,so i thought i found the problem and flushed a few times from the top of the rockwool and changed rez however problem refuses to be cured.Using gh 3 part and keep ppm around 850 tp 1000 ,temps in room get up to 90 ,running 3 1000 watters with lots of air movement and also started using co2 boost(great product).Problem starts with leaf tip curl....leaf will curl all the way up into the bud,ive never seen anything like it in 3 years of growing .ro water with calmg is also used.Appears to be phosphate def but i dont understand why im unable to fix, once it starts......any thoughts??
starmark Reviewed by starmark on . latewood ,stinky.......anybody.HELP This reaccuring problem has been with me for the last 3 grows,ive been able to finish except for the last grow which killed all plants at about week 5 of flower.no problems seen untill about week 3 or 4 then it comes on quick.White widow grown in rockwool ,ebb and flow,ph i keep at 5.6 however checking runoff for the first time ph was 7 in rockwool ,so i thought i found the problem and flushed a few times from the top of the rockwool and changed rez however problem refuses to be cured.Using gh Rating: 5