4 weeks flowering and large fan leaves yellowing with necrosis

I've had 2 successful grows under my belt so far and I'm currently growing 1 clone of pineapple trainwreck and 1 clone of hash plant, but for about a week and a half my leaves are progressively yellowing from my largest fan leaves up to my newest growth with necrosis and large fan leaves falling off the plant. I'm using the same nutes I've used for the last 2 grows which is IONIC Grow, GH flora bloom and flora micro. My soil (foxfarm ocean forest) PH runoff is 5.9 and I just flushed with 10 gallons in each 5 gallon pot a few days ago.

I looked online and I assumed my situation was a cal mag deficiency so I just treated with a little cal mag tonight but my runoff was 5.9 so I am thinking my soil is too acidic and I might be getting a combo effect of nute lockout and too low ph causing necrosis...I don't have a camera or I'd take pics but my description is very accurate. Bud development seems to be unhindered but if my leaves don't hold up another 4 weeks, jonny won't be harvesting anything good...

any assistance would be greatly appreciate....I really don't want to lose my grow as I'm several months behind as it is. I will work on getting some pics up

Just flush them like you did. At week 4 you'll start seeing this type of thing. Fox farm is hot soil. How tall are the plants and how long did u veg for? Pot size? Use promix. Its way easier to keep balanced

Most likey a combination of being under fed in general and a lack of nitrogen in the nutes you are feeding them. Most bloom formulas are severely lacking in nitrogen and then people go and add bloom boosters on top of that which just makes things worse. I personally have have found that using a balanced NPK ratio close to 1-1-1 (using veg nutes start to finish) provides the best overall plant health and yield, and the plants don't drop leaves during flowering.

DaleRoberts said:

Just flush them like you did. At week 4 you'll start seeing this type of thing. Fox farm is hot soil. How tall are the plants and how long did u veg for? Pot size? Use promix. Its way easier to keep balanced

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Plants are about 3 1/2' tall in 5 gallon pots. I vegged the 2 clones for about 5 weeks and they looked healthy all the way until I started flowering...I was going to use promix on this grow but for various reasons it didn't get done.

Huel Perkins said:

Most likey a combination of being under fed in general and a lack of nitrogen in the nutes you are feeding them. Most bloom formulas are severely lacking in nitrogen and then people go and add bloom boosters on top of that which just makes things worse. I personally have have found that using a balanced NPK ratio close to 1-1-1 (using veg nutes start to finish) provides the best overall plant health and yield, and the plants don't drop leaves during flowering.

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Thanks for the advice huel...I've heard from another seasoned grower that some people use veg nutes all the way through with success. I think I'll try substituting my next feeding with the ionic veg instead of the gh bloom nute I've been using. Can't wait for my pots to dry up a bit so I can try this out....will report back and my POS blackberry is charging so I'lll throw some pics up tonight.

they need N-

you are finally vegging vigorous plants. this vigor will require sustained N as huel mentioned.
feed veg once , then use 50/50 veg bloom. adjust ratio as needed.

now that i think back-

once before, i used ionic as it was new and bottled in MI. it did the same thing. total lack of N.

track down some J.R. peters (jack's), and upgrade instantly. are you near the city? bags(30#) of PRo quality ferts at the supply house are thirty bucks.

Can't recommend Jacks enough. 20-20-20 or the citrus can be used from start to finish. Havent had a deficiency, leaf loss, nada.

Plus it costs less that $2 per plant if that from start to finish. Jacks is a full fertilizer, complete with almost everything ya need.

Ocean Forest is a bitch keeping the PH up. I THROW A HANDFULL of dolomite in each pot and it still starts dropping after about week 6.. Your situation is pretty common in my experience and I have yet to fund a cure. I just do my best to keep tue PH up, co tinue feeding and even when a plant gets in a funk they have still yielded great results.

Thank you all so much for your help...every grow presents a new problem to be resolved and it appears this is a simple one - a simple nitrogen deficiency. I just read my GH bloom bottle and there's not a stitch of nitrogen in it which makes sense why I'm having the problem I'm having. I must have just lucked out on my last 2 grows but now I see why the nute regimens the company gives out says to use veg even in flower at lower rates. I will water with only grow tonight and deal with any over watering symptoms I might get to raise this N level...more and more leaves turning yellow. I can't believe I let things go this long but I will report back my results tomorrow night when I open up the tent...

Stompromper said:

Ocean Forest is a bitch keeping the PH up. I THROW A HANDFULL of dolomite in each pot and it still starts dropping after about week 6.. Your situation is pretty common in my experience and I have yet to fund a cure. I just do my best to keep tue PH up, co tinue feeding and even when a plant gets in a funk they have still yielded great results.

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I hear ya man...I put 2 gallons of 8.0 through my pots and I'm still getting a 5.9 and 6.0 reading on both run off's....un fucking believable. I will be switching to promix exclusively when I transplant my vegging babies into their 5 gallon pots for flower. I'm done with this ocean forest. I tried sunshine mix #4 which a lot of people recommend and my run off was 4.9 and nearly killed my seedlings, so I'm no fan of sunshine. I've never heard of anybody having a ph issue with promix so I'm sold...

I just did a search for N deficiency during flower and the pics ALL match exactly what my plants are showing. This is the shit that happens when you work 60 hours a week and don't handle shit promptly...ya live and learn I guess so chalk this one up as another learning experience. This forum once again saved jonny's harvest!

All off the advice you've gotten is spot on. We are lucky to have such a knowledgeable community here.

The nice thing is N deficiencies are easy to fix.

Absolutely.

TonightYou said:

The nice thing is N deficiencies are easy to fix.

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Except for the fact that he's flowering and his damaged leaves won't recover...

He will still get some good buds to puff on.

True. Loss of leaves will mostly effect yield, not so much potency.

One thing to keep in mind regarding promix. It is not true soil so in effect you will be running passive hydro, so if you see PH in the 5's don't worry. I keep my promix at 5.7 PH and the plants drink it up. Promix is great for running the Drain to Waste method.

Nitrogen deficiency is easy to remedy if thats all it is... but if you have a ph issue causing lockout throwing more N at it will only compound your problems..

I've tried quite a few different soils most recently Potters Gold.. and I'll tell ya, nothing has done better for than Fox Farms.. Never tried ProMix but isnt that shit all peat? Peat is the big problem with all the soils going sour.