Problems during flower

Hi Guys,

I'm having some problems that started a week ago, but I cannot seem to fix it, I tried about everything.

Some information :
Strain : BCC x Jealousy
Flowering time : 9 weeks

Current flowering stage : start of week 7
Current temp : 23c
Current RH : 60%
Current CO2 : 1150ppm
Current PPFD : 1000-1200 (using 3 lumatek 600w 2.9)
Current EC : 2.2 (using floraflex nutrients)
Current PH : 5.9-6.2

I started noticing some wilting of the top fan leaves, since i'm growing in 11L coco smart pots, I did not think about underwatering, since they are getting watered 4 times a day with enough runoff each time. But now i'm seeing more and more leaves shriveling, dying, at the lower parts of the plant. Currently they are hanging to the side, because I need to put a new trellis net to support the weight of the buds. The leaves that are dying do not feel crunchy or dry, just like they got mushed.

They used to get 3.2 EC for the first 6 weeks, and 1500PPM of CO2, and everything looked fine, so I thought i might have been a nutrient lockout, so I started decreasing the EC to 2.2, and lowered the CO2 to about 1150ppm.

What im currently giving is :
I start with Tapwater @ 0.3-0.4 ec
0,1ml/L - PowerSi Original
1,5ml/L - T.A. CalMag
0,5g/L - Floraflex B1
0,5g/L - Floraflex B2
1g/L - Floraflex Full Tilt
0,5ml/L - Botanicare Hydroguard

EC comes down to 2.2EC in a 250L Tank, after PH adjusting its in the range of 5.8-6.2


Things I did to try to solve it :
- Lowered CO2 from 1500 to 1150ppm
- Lowered EC from 3.2 to 2.2
- Flushed entire medium for 24h with high strength T.A. Flashclean (3ml/L) and let circulate for 24h
- Flushed entire medium with PH'd water (5.8ph)


This is the first time i'm growing this strain, and since about 1 week ago, all was going superb, fast growth, big plants! (165cm), nice buds, healthy looking, etc...
I did not change anything during that period, so I have no clue whats going on. The only thing I might think of is that it could be root bound, or have root problems. Because other than that, I don't know what could be the issue.

Hopefully this is enough information for any experienced grower to help me out.

I made photos in different light settings, with lights off & lights on, so u can see real colors etc...

Thank u guys!

How close are the lights to the canopy ?

Well your temps definitely aren’t helping your 3.2EC feeds that’s for sure. Your red woody stems tells me your locked out

They look heavy in N and just overfed in general

Id flush your high EC out of them and drop that to 1.5ish for the remainder of the grow

bk78 said:

Well your temps definitely aren’t helping your 3.2EC feeds that’s for sure. Your red woody stems tells me your locked out

They look heavy in N and just overfed in general

Id flush your high EC out of them and drop that to 1.5ish for the remainder of the grow

Click to expand...

I've based my temps & RH on the VPD chart from pulse, which should be close to ideal range like this :


They've been having red stems since start, so I think it might be a strain property.
The overfed could be indeed the issue, thats why I allready dropped down to 2.2EC, maybe I should indeed lower it more.

Thanks for the input! Appreciated.

Leeski said:

How close are the lights to the canopy ?

Click to expand...

They are pretty close, I had to drop the table a couple times, since start of flower and end of strecht they literally grew almost 1,20m...
Right now I think lights are about 20-25cm from the tops.

NPK All The Way said:

I've based my temps & RH on the VPD chart from pulse, which should be close to ideal range like this :
View attachment 5231218

They've been having red stems since start, so I think it might be a strain property.
The overfed could be indeed the issue, thats why I allready dropped down to 2.2EC, maybe I should indeed lower it more.

Thanks for the input! Appreciated.

Click to expand...

As you can see by the chart higher temps is better. You’re right on the verge of yellow

NPK All The Way said:

They are pretty close, I had to drop the table a couple times, since start of flower and end of strecht they literally grew almost 1,20m...
Right now I think lights are about 20-25cm from the tops.

Click to expand...

They look light heat stressed to me ..
im not clued up with feeds and EC so hopefully someone can give you more advise than I , hope you sort them out good luck op

Drop to 1.2EC with a grow nutrient, drop all the other useless crap and you won't see this again.

Leeski said:

They look light heat stressed to me ..
im not clued up with feeds and EC so hopefully someone can give you more advise than I , hope you sort them out good luck op

Click to expand...

Any light stress I’ve ever seen has the serrated edges of leaves curing up? And it’s definitely not heat related with his temps he’s running.

bk78 said:

Any light stress I’ve ever seen has the serrated edges of leaves curing up? And it’s definitely not heat related with his temps he’s running.

Click to expand...

Leaves curling tacoing is early signs heat/light stress they are looking well past that (fried) -I was basing my comment based on how the leaves seem to be in better condition lower down the plant

Leeski said:

They look light heat stressed to me ..
im not clued up with feeds and EC so hopefully someone can give you more advise than I , hope you sort them out good luck op

Click to expand...

Thnx, with heat stress they would curl upwards and its definitly not heat issue. I've read the leaf temps and they are also 23c so that should be good.
None of the leaves are crisped or anything either. But again thnx for thinking with me

bk78 said:

As you can see by the chart higher temps is better. You’re right on the verge of yellow

Click to expand...

I'll increase temps a little bit. But I'm doubting if the 1-2c difference in temps will cause this issue.

inth3shadowz said:

Drop to 1.2EC with a grow nutrient, drop all the other useless crap and you won't see this again.

Click to expand...

Im basically only using Silica, Calmag, Base nute & PK booster, so its not like im using 14 different advanced nutrients bottles....
With Grow nutes, i'm gonna have too much N, which they allready have more than enough...

NPK All The Way said:

I'll increase temps a little bit. But I'm doubting if the 1-2c difference in temps will cause this issue.

Click to expand...

Well higher leaf temp will include higher transportation rate. Ya know just photosynthesis stuffs

Best of luck with your next cycle, this ones pretty much toast.

NPK All The Way said:

Im basically only using Silica, Calmag, Base nute & PK booster, so its not like im using 14 different advanced nutrients bottles....
With Grow nutes, i'm gonna have too much N, which they allready have more than enough...

Click to expand...

Yet look at how your plants look...mine are healthy with healthy buds. But hey, keep doing what you're doing. Feed 4.5EC for all I care lol

NPK All The Way said:

I've based my temps & RH on the VPD chart from pulse, which should be close to ideal range like this :
View attachment 5231218

They've been having red stems since start, so I think it might be a strain property.
The overfed could be indeed the issue, thats why I allready dropped down to 2.2EC, maybe I should indeed lower it more.

Thanks for the input! Appreciated.

Click to expand...

VPD charts are about the relationship between temp and humidity, they don't indicate 23° is best. I'm a nobody, but everything I've ever read says around 27-29° is best under led, higher with elevated co2.

Changing a whole bunch of things at once makes it very difficult to figure out what is and isnt working. You may have stressed the plants more in the process.

inth3shadowz said:

Yet look at how your plants look...mine are healthy with healthy buds. But hey, keep doing what you're doing. Feed 4.5EC for all I care lol

Click to expand...

No need to react like that. But hey thnx for the input

1212ham said:

VPD charts are about the relationship between temp and humidity, they don't indicate 23° is best. I'm a nobody, but everything I've ever read says around 27-29° is best under led, higher with elevated co2.

Click to expand...

Thnx for the input. Ill make temps higher hopefully that helps em out

That is lockout. throw clean water at it. drop that EC. Feed lower. Do less, have less issues.