Extreme yellowing mid/late flower...?

shiva71 · 2025-04-14T04:16:37-0600

Hi!
This is a Mephisto Super Orange Haze auto, DWC, EC 2.0 pH 6.2 SF2000 light...made a right fkin mess of this grow so they're not so great looking :/
You expect some yellowing towards harvesting but this is really noticeable, is this just the plant doing its things and sending all its energy into buds (yummy) or do i have some kinda deficiency?
Thanks!!

Hollatchaboy · 2025-04-14T04:25:03-0600

Looks like nitrogen deficiency.

shiva71 · 2025-04-14T05:38:22-0600

Hollatchaboy said:
Looks like nitrogen deficiency.

Right thats possible i pretty much cut out N during flower partly cos i nearly always run into trouble with N toxicity.

Hollatchaboy · 2025-04-14T06:06:31-0600

shiva71 said:
Right thats possible i pretty much cut out N during flower partly cos i nearly always run into trouble with N toxicity.

Nitrogen is still needed throughout flower. Don't cut it out completely.

If yellowing is going to occur, it should be during the maturing of the bud stage, not the growing of the bud stage. You want leaves to be green, so that they can keep up with the high demand of the flowers.

driver77 · 2025-04-14T06:15:05-0600

With autos especially N is needed for longer in the grow imho
I run the same formula from seed to harvest (Jacks 321) with good results. I have their bloom formula and have just never used it.
Depending on your nutrient line maybe extend the recommendations for early flower out a few more weeks in the future.

shiva71 · 2025-04-14T09:11:59-0600

driver77 said:
With autos especially N is needed for longer in the grow imho
I run the same formula from seed to harvest (Jacks 321) with good results. I have their bloom formula and have just never used it.
Depending on your nutrient line maybe extend the recommendations for early flower out a few more weeks in the future.

Yeah thanks, i just seem to hit problems with N tox every fookin grow! This is one of my girls, deffo N claw so i then back off with the N...
This is by far my worst grow, i screwed up at the start and theyve never really recovered...

Budzbuddha · 2025-04-14T11:59:41-0600

the lowers are the older leaves. Pull off the most damaged …. Plant is concentrating on those upper flowers ( that is where the better looking part of plant is. )

Also you might be having some light stress on those tops - see the flat top of flowers ? That is a sign of light stress when flowers have a flattened top to bud.

Plant will not miss those necrotic leaves if you prune them off.

Nutty sKunK · 2025-04-14T13:23:51-0600

shiva71 said:
Yeah thanks, i just seem to hit problems with N tox every fookin grow! This is one of my girls, deffo N claw so i then back off with the N...
This is by far my worst grow, i screwed up at the start and theyve never really recovered...

You know you can induce N tox simply by messing with the environment?

Heat, humidity, light intensity and wind will influence feeding requirements. You will need to feed less due to increased transpiration from all of the above factors.

The best thing you can do is keep the room stable. Whatever the conditions (within reason) and this won’t cause the plants demands to shift so much.

Less is more.

It’s easy to feed a hungry plant but time consuming to correct an overfed one

driver77 · 2025-04-14T15:20:29-0600

What nutrients are you using?
how much and how often?

cat shit · 2025-04-15T03:01:06-0600

shiva71 said:
Yeah thanks, i just seem to hit problems with N tox every fookin grow! This is one of my girls, deffo N claw so i then back off with the N...
This is by far my worst grow, i screwed up at the start and theyve never really recovered...

When i grow autos ill go half grow half bloom during weeks 5 to seven and that usualy gets them through ok these 2 lemon ak autos didn't get quite enough and as you can see at 14 weeks they had a pretty dramatic fade/ nitrogen deficiency but the end product was brilliant. Don't give up on your grow i'm sure you can nurse that plant to the finish cut out ya N, clean it up and get her to the chop.

shiva71 · 2025-04-15T04:26:47-0600

driver77 said:
What nutrients are you using?
how much and how often?

I was sorta cycling Canna Flores, CalMag and Super PK (both Aptus) but since its looking like a N deficiency i did a rez change yesterday and added some Aptus all-in-one stuff which has an NPK of 6-12-6. So shes been on that since yesterday lets see if the additional N makes a difference...

driver77 · 2025-04-15T05:19:26-0600

shiva71 said:
I was sorta cycling Canna Flores, CalMag and Super PK (both Aptus) but since its looking like a N deficiency i did a rez change yesterday and added some Aptus all-in-one stuff which has an NPK of 6-12-6. So shes been on that since yesterday lets see if the additional N makes a difference...

Your ratios are getting out of wack....the plant shows signs of N tox at some point and then swings to the other extreme. I suggest going with 1 nutrient program and sticking with it. Like the all in one you just used...except use it from start to finish. The mixing and supplementing gets tricky quick. Make sure your calmag doesn't have a bunch of N in it also.
I just noticed your ph is on the high side too......5.5 to 5.8 for dwc. This could be the issue if it's been high the whole grow.

cana123 · 2025-04-15T09:53:25-0600

shiva71 said:
Hi!
This is a Mephisto Super Orange Haze auto, DWC, EC 2.0 pH 6.2 SF2000 light...made a right fkin mess of this grow so they're not so great looking :/
You expect some yellowing towards harvesting but this is really noticeable, is this just the plant doing its things and sending all its energy into buds (yummy) or do i have some kinda deficiency?
Thanks!!

Hey! That yellowing near harvest is mostly normal as the plant shifts energy to bud production, but if it's extreme or patchy, you might also be seeing a nitrogen or magnesium deficiency creeping in.

Extreme yellowing mid/late flower...?

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