1800 - 2000 ppm is about where I have them during the final two weeks. The plants are too late in maturing so over nuting shouldn't be a prob. Just be sure to flush very good or you will taste the nutes. Just my 2 cents. Maybe you should try both. One grow with the ppm's like whoa and the next one laid back or how your friend recommended to cut back. See the results for yourself. The pics are of the last plant I flowered. Good luck.
SCIENTIXT Reviewed by SCIENTIXT on . When do hit max PPM? This is a repost from general growing questions, didn't receive much feedback..so I'll ask the indoor crew (was meaning to spend more time here anyhow!) I usually give them the higher PPM towards the end of the run... in the last three weeks I use my regular flowering nutes as well as "Shoot Powder" which is real high in P to finish em up and then flush them out. I have a friend who told me he hits his peak PPM around five weeks, and then lowers it gradually and finishes in 8.5 weeks. Rating: 5