Small buds: Week 5 of flower

Hi everyone, first post here
It's been 39 days since flipping to 12/12, but the buds seem really small.
I'm using a 100w full spectrum led panel, and an extra blurple light I had laying around, which is about 50w.
This is my first grow in a tent (it's a 2x2x4), had a couple outside and one in a space bucket.
I thought I might've been giving her to much light and thus stunting her growth, so I raised both lights to about 40cm from the canopy from 25cm a couple days ago.
She received 800-1000 ppfd before, now se get around 500 (measured with the app Photone).
The strain is Mimosa EVO from Barney's, supposed to flower 10 weeks. Using coco mixed with perlite as my medium, tent has been pest free.
Been watering 4 times a day with 900ppm, 5.9 pH.
Nutes are from Bionova; Coco Forte A+B and a bit of Big Bud from AV, started with Green Sensation from plagron instead of the Big Bud yesterday.
Temps are around 23°C, humidty about 50%.
Am I overlooking something? A deficiency maybe?
Any way I can salvage this run?Buds seem too small for week 5.

Wait five more weeks and post a pic
Every pheno of every strain varies but patience is common to all

They do look delayed, I'm running a few Mimosa x Orange Punch by Barney's Farm and they have similar bud development at around the 14-19 day mark.

Thanks for the fast replies guys!
So I should just wait? Guess I can't do anything else rn.
I was a little aggressive with my PK feeding, can that have something to do with it?
The Coco A+B nutes from Bionova say they can be used in veg and flower, but it has an NPK of 8-6-12, which seems a little high in N for flower. That's why I was using the Big Bud and now Green Sensation, but could this have been too much?
Thanks again!

I’d lower your feed ppms to 750-800 and up your p, k. Your plants look dark green and shiny, signs of high nitrogen. High n can inhibit flowering

Thanks for your reply 93OG!
I’ll try getting the ppm that low, though I’m using pretty high EC tap water. When lowering the N I’ll also be lowering the macronutrients, as only the part A has the macros, hope this is ok?

Shouldn’t Be a problem based on the look of your plants. Still use the recommended ratios for your an and b just 10-15% less of it and the same amount of p, k booster.

93OG said:

Shouldn’t Be a problem based on the look of your plants. Still use the recommended ratios for your an and b just 10-15% less of it and the same amount of p, k booster.

Click to expand...

Yeah was doing that already. 1.5ml/l of A and 2ml/l of B, and ofc the pk booster. Thanks again for the help

73f is a bit low temp wise under led

BasilRuys said:

Yeah was doing that already. 1.5ml/l of A and 2ml/l of B, and ofc the pk booster. Thanks again for the help

Click to expand...

I think he meant keep the ratio of A n B as suggested.. just lower both.

coreywebster said:

I think he meant keep the ratio of A n B as suggested.. just lower both.

Click to expand...

Ah ok I’ll lower both then, thanks again

150watt total ain’t doin you no favors either.
Double that and you would be fine.

Less nitrogen and more light if you want bigger buds.

I call them 'runt' plants. They're usually an unlucky seed in a batch that grows more slowly than the others, is smaller, and doesn't yield much either. But if you have more than one it could be many issues... I'd check PH and root ball PH

No to bash Barney’s farms to bad but I’ve not had good luck with their seeds. I got a pack from local grow shop and first 2 never popped so the 3rd one popped but was very slow growing the whole way though and turned out to be mediocre at best. I’m sure there is plenty of folks that have had great results with their seeds but maybe I got an old pack that had been on the shelf for a while so can’t say it’s all the breeder

Budzbuddha said:

150watt total ain’t doin you no favors either.
Double that and you would be fine.

Click to expand...

150 aint bad for a 2x2 really. Thats like 38 watts per sq ft. I think the OP has bigger problems. I don't want to say the dreaded B word, but I would check for them anyways.

Thanks everyone for the replies! All help is really appreciated.

Treesomewanted77 said:

No to bash Barney’s farms to bad but I’ve not had good luck with their seeds. I got a pack from local grow shop and first 2 never popped so the 3rd one popped but was very slow growing the whole way though and turned out to be mediocre at best. I’m sure there is plenty of folks that have had great results with their seeds but maybe I got an old pack that had been on the shelf for a while so can’t say it’s all the breeder

Click to expand...

First time running Barneys for me, had one auto that started flowering in week 2 and ofc the Mimosa EVO. Had broken off a couple of branches while trying LST in week 4-5 of veg. Then I decided to just top to the second node, getting a sort of mainline.In total, she vegged for about 3 months. So slow growth for sure…

Antidote Man said:

I call them 'runt' plants. They're usually an unlucky seed in a batch that grows more slowly than the others, is smaller, and doesn't yield much either. But if you have more than one it could be many issues... I'd check PH and root ball PH

Click to expand...

I aim for a pH of 5.8 when adding nutes to my water, and it drifts to around 6 after a day or two. My runoff is around 6.5, which should be fine, right?

Kamau42 said:

150 aint bad for a 2x2 really. Thats like 38 watts per sq ft. I think the OP has bigger problems. I don't want to say the dreaded B word, but I would check for them anyways.

Click to expand...

Are you referring to bugs? Haven’t seen any gnats or mites this whole grow, and I thought coco was pretty resistant against pests. I could be wrong ofc.

Can this stunt in growth be due to light burn?
I know of it bleaching the buds white bud haven’t heard of it halting growth or bud development

Thanks again for the responses!

BasilRuys said:

Thanks everyone for the replies! All help is really appreciated.



First time running Barneys for me, had one auto that started flowering in week 2 and ofc the Mimosa EVO. Had broken off a couple of branches while trying LST in week 4-5 of veg. Then I decided to just top to the second node, getting a sort of mainline.In total, she vegged for about 3 months. So slow growth for sure…




I aim for a pH of 5.8 when adding nutes to my water, and it drifts to around 6 after a day or two. My runoff is around 6.5, which should be fine, right?


Are you referring to bugs? Haven’t seen any gnats or mites this whole grow, and I thought coco was pretty resistant against pests. I could be wrong ofc.

Can this stunt in growth be due to light burn?
I know of it bleaching the buds white bud haven’t heard of it halting growth or bud development

Thanks again for the responses!

Click to expand...

I'd heed the above suggestions that too much Nitrogen will stunt bud production and you're on the very lowest end of the spectrum for light wattage. Looks vigorous though, I wouldn't give up on her.

Also if your temps are 23c how come the plant looks more like it's heat/light stressed? Looks like your light is pretty high above the canopy. What's the deal with that?

The way the new growth is coming in is not stacking. Personally I would cut losses and not waste another second on her. This looks like another 8 weeks of suffering.

Edit: it does look like some of the branches are developing more regularly than the last pic