Looking small for 3 weeks into flower?

Honestly I do see ANY issue connected with your watering/feeding schedule. If somebody do, let me show where? I am not familiar to growing in coco but they look completely healthy to my noobish eye. For me is sometimes problem to water/feed my 3 poor plants every 5th day so can not imagine feeding or watering multiple times a day. But when you have time and works it good for you I personaly do not see any problem in it. Truth is that guys are right and you will discover it sooner or later depending on how you will follow their advices. Another thing is your light, okay be cool and say: I did the same bro and not once but twice! Luckily I had some experiences before with HPS so immediatelly when I see the colour of the emiting light, I have send it back, so technicaly get learnt without losts. But... This is not your biggest problem, you still can grow average plants under these cheapos lights. I see the biggest problem in genetics! Together with the light you have your plants look like this. Next time buy quality seeds, better light and run it in soil. If you want coco than I would recommend to follow advices of the guys, because coco likely needs much more controled feeding/irrigaring schedule than soil, so when you start to grow good genetics plant under better light than your feeding schedule fail in a week and you will have issues soon. Good luck with your grow

MickFoster said:

I'm sure you're a great grower......although you did say you've "grown in coco".......meaning you don't anymore.
You admitted in an earlier post that your run off is minimal..........that will definitely cause salt build up.
I prefer to follow the experts' advice.......www.cocoforcannabis.com.
I've never had salt build up in coco in over 25 years........and I feed every day.
Coco is drain to waste hydroponics.........like all hydroponics it should be fed and have nutrients available at all times.......unlike soil.
Good luck to you.

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I just found that salt buildup in coco was detrimental. I feel, & I might be wrong, that the nute buildup in the root system is adequate for going 3 days without feeding.
Peace out bro

Jimdamick said:

I just found that salt buildup in coco was detrimental. I feel, & I might be wrong, that the nute buildup in the root system is adequate for going 3 days without feeding.
Peace out bro

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I feed 100% coco, once daily, with about 900 ppm of a general purpose mix to about 15%-20% runoff. If I don't up-pot I need to feed twice a day to keep my hungry plants happy in flower.

I do up-pot kind of often to keep my watering at once a day to keep it simple for myself.

Nappertunity said:

I feed 100% coco, once daily, with about 900 ppm of a general purpose mix to about 15%-20% runoff. If I don't up-pot I need to feed twice a day to keep my hungry plants happy in flower.

I do up-pot kind of often to keep my watering at once a day to keep it simple for myself.

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Ultimately what size pot do they end up in? I've been using a 3 gal for a while, might try this next time around

MickFoster said:

It's not necessary to feed 3-5 times daily unless you're in very small pots. I grow in 2.5 gal. air pots and I feed once a day in veg and twice a day in flower.
If you want the best grow guide for growing in coco.......www.cocoforcannabis.com is what I recommend and follow.

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I've actually gotten a lot of my info off this site-thanks again. I've been using 3 gal plastic pot-I was only watering twice a day until maybe a week ago when I got back on the site and saw their recommended feed schedule-beefed up the feeding thinking that was what's keeping my buds small

Salt can’t build up in coco if you are flushing to runoff daily through fertigation... if the salts from nutrients are reacting in any way with the coco, it’s because it wasn’t washed and buffered properly.

I am in 2.5gal air pots as well, and 2x a day, every day results in EC going out nearly the same as going In.