I would start to flush them now and let them go to finish as long as possible.
If you have 3 weeks left then just use Ph adjusted water for the last 3 weeks. That will give you a good flush period and they should start to use up stored chlorophyll as well. That will improve the overall taste and speed up the curing process too.
Zandor Reviewed by Zandor on . WHEN SHOULD I STOP NUTES plants went in late may (sativas-bag weed) i am in the great lakes area. hard frost will start late oct - the 2nd week in nov. so the weather will give me 3-4 more weeks at best. here is my best trich pics taken 10/8/05 when should i stop feeding? and when should i pull them? 1st 3 pics are plant 1 and 2nd 2pics are plant 2 Rating: 5