Slow growing buds - AK47 in coco

Oh wise master of the growing arts...

I come to you with a question. I have a little cabinet going, with the following key statistics:
150W HPS sodium light
Growing in coco
Feeding with CANNA brand nutrients (Coco A+B, Cannazym and Cannaboost), top down watering every 4 days
10L pots
2 plants in about 2,5 square foot cabinet (so around 6000 lumens/ft2)
Serious Seeds AK47, feminised seeds
Temp during day 24C, temp during night, gets down to about 15C
See photos below...

My problem is this: I germinated for 40 days, then switched over to a 12/12 schedule to induce flowering. All through veg and the start of flowering, I have been really impressed (this is my first time under HPS lights). The girls have been going gangbusters, really quick bushy growth, no problems at all - I have honestly not had to cut a single leaf due to lack of nutes, burning by nutes, etc. Really, really healthy. The plants stretched like hell after flipping to 12/12, they were only about at the screen at that time, now they are maybe 14inches above it

But now I am 3 weeks into flowering, and still seeing really slow bud growth. I think the stretch has now finished, but I am anxious to see buds forming up quicker and bulking out. I thought AK47 was pretty indica, so should be quicker than what I am seeing, no?

So what should I do? Do I need to change anything? Or am I just being impatient

Please help, would be greatly appreciated

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Make sure you don't have any nutrient lockout in the soil.
Did you give them a nice big phosphorous boost right at the start of flowering?
They might just need a little more juice, as they do appear to be growing kinda slow for 3 weeks into flowering.

they look about right for 3 weeks after 12/12. its really all just genetics. im almost to week 2 of 12/12 and most of my plants arent starting to bud at all yet but my 4 FCJ are about where yours are at. a little patience m8 and you will be alright, just let them do thier thing and you will get results.

when i started my first grow i had 3 different strains 2 of them were looking awesome by week 4 and the other one was looking about the same as yours are right now..i though something was wrong....nope couple weeks later the one plant had caught up and ended up yeilding as much as the other 2 combined. moral of the story....good things come to those who wait, have heard good things about AK and have heard they are pretty high yeilders.

Twohearted said:

Make sure you don't have any nutrient lockout in the soil.
Did you give them a nice big phosphorous boost right at the start of flowering?
They might just need a little more juice, as they do appear to be growing kinda slow for 3 weeks into flowering.

Click to expand...

no disrespect man.

i would not take this advice, adding more than your scheduled nutrient dosing will only promote toxicity and PH flux's and could end up being a nightmare, keep up what your doing. obviously your going to want to step it up gradually as you go but i wouldnt go giving them extra nutes unless they are showing deficiencies, which they do not appear to be.

What Matt said. And they look about right for 3 weeks in. They should start to fatten up now that the stretch is over. Good luck they look nice.

RetiredMatthebrute said:

Twohearted said:

Make sure you don't have any nutrient lockout in the soil.
Did you give them a nice big phosphorous boost right at the start of flowering?
They might just need a little more juice, as they do appear to be growing kinda slow for 3 weeks into flowering.

Click to expand...

no disrespect man.

i would not take this advice, adding more than your scheduled nutrient dosing will only promote toxicity and PH flux's and could end up being a nightmare, keep up what your doing. obviously your going to want to step it up gradually as you go but i wouldnt go giving them extra nutes unless they are showing deficiencies, which they do not appear to be.

Click to expand...

I agree with matt. I am currently running serious ak47 and ran a bunch last year. Ak47 takes a long time for bud development. Check back in two weeks if things don't look up.

Thanks so much for the advice guys, really appreciate it. Patience has never been my strong suit, but I will hold my nerve here and not make any crazy adjustments.

One further question if I may: I am using CANNA nutes, don't know if you are familiar with them? I want to hit the plants with the PK nutrients they sell (in addition to the A+B, Cannazym and Cannaboost I use already), but not sure when to start adding it. It says on the bottle to hit them with it "3 weeks before harvesting"... but when harvest time will be is really hard to judge before before the fact? Any ideas?