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Can anyone help me understand NPK a little better? I just switched to flower two days ago and I'm trying to make sure my ratio is correct before I switch from veg nutes to flower nutes.

This is my first grow. I've been using a 315w cmh with no problems. Im About to flip soon and and have just added an HLG 550 rspec In The tent with my cmh. Now all of a sudden I'm getting all these deficiencies and my plants seem to look sick. Plants are about 45 days old Temp is 82 Co2...

Trying to decide if I should wait for this to blow over before I flip to flower. Purple veins, yellow fan leaves and purple lines in stalks.

Hello All, Thanks for your time. I have a couple questions I cant figure out. I'm growing in soil, a mixture of about 60% bushdoctor coco loco and 40% ffof. I've been feeding plants nutes through AACT's; the last tea was... 2gal RO 25 liquid seaweed 25 ml liquid fish .5 tsp humic acid 8 tsp...

Hey guys, this is my first grow and I'm trying to get the best bud I can produce. I have a question about lighting going from veg to flower. Can I use my CMH 6500k for the streching period of flower to keep stretching to a minimum- then swap it out for my HLG 550 r-spec to get good quality...