HELP! Yellowing Sugar Leaves With Brown Spots During Flowering

I am in week 6 of flowering. The sugar leaves are yellowing and have some brown spots, as shown in the attached pictures.

Is this nutrient burn, or something else?

I have been following the attached fertilization schedule, weeks 5-9, respectively corresponding to weeks 1-5 of my flowering. I am using 1/2 the amounts of Big Bloom, Grow Big, and Tiger Bloom given in the schedule per gallon of water. I am using Happy Frog Organic Potting Soil Mix.

What should I do to stop this?

I have not fertilized for week 6. Should I?

I thank anyone in advance who responds to this.

Could be salt buildup did you try flushing and check you ph levels do you have a ppm pen

I don't have a ppm pen, but I just ordered one.
I haven't flushed, but I will perform my first flush tomorrow, but I won't have the pen yet.
How should I perform the flush without the pen, i.e., how do I know when to stop?

What size is your pot, 3 gal or 5 gal? For 3 I would flush with at least 3 gal of water (not all at once) 1 gal wait 10 min, repeat 5 gal same

Thank you, Rocha_Farms!

I have a 5 gallon pot. Should I flush with 5 gallons?

Do not flush soil your plants probably started starving. Week 5-6 of flower, you'd be shocked at how hungry these plants get. You need to know the EC/PPM of your feed water to really tell if you're in a good feeding range.

Anyone else think they also look a little hot as well,possible light stress issue?full plant pics may help

Just me i guess lol. If its a feeding issue too much to little what do the rest of leaves look like ?

bam0813 said:

Just me i guess lol. If its a feeding issue too much to little what do the rest of leaves look like ?

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Could be overfed as well looking at the brown leaf edges. Hard to say...if he's feeding soil nutes every watering with a high EC/ppm then that's the problem.

Here is the real problem ……..


It’s the Feed Schedule Fox Farm lists. It is ridiculously high in multibottle feed BS.

Sounds like you are running the “ Trio “ line - gro big/ big bloom / tiger. In reality this a 2 part nute system … Gro big for VEG - Tiger bloom for Bloom.

The “ big bloom “ product isnt what label “ sounds “ like for plant , it is an organic product for feeding microbial activity in soil. Micronutrients and such.
It will not “ bloom “ your plants.

Fox Farm us doing a big disservice with that feed schedule - you will notice they list a shit load of other bottles / products to run along side. You need nothing but the tiger bloom. You are IN BLOOM.
Grow big adds nothing after late stage flowering as plant is no longer making leaf or branches. The wonky PPM numbers they suggest are generally too much. By running this system of products at their recommended doses - guarantee excessive salt buildup ( thats why they want you to buy sledgehammer flush ). Less is more with this line

As a matter of fact , you could even just Top dress FFOF ( ocean forest ) into top soil of plant container and just water that in to feed. No guessing / no buying this and that. Or at least reduce your feed by half strength.

Here are the entire plants. Any additional thoughts?
I have been feeding every third watering.
Salt build-up makes sense to me for these reasons: When I watered, there was not a lot of run-off, about a cup. I collected the run-off and added it back during the next watering. I noticed salt build-up in my run-off colletion vessels.

Thank you everyone.

P.S. I am getting equipment to measure ppm, ph, and EC. It will arrive in a couple days.

growgeye said:

Here are the entire plants. Any additional thoughts?
I have been feeding every third watering.
Salt build-up makes sense to me for these reasons: When I watered, there was not a lot of run-off, about a cup. I collected the run-off and added it back during the next watering. I noticed salt build-up in my run-off colletion vessels.

Thank you everyone.

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Right there is where you goofed - Adding runoff back into medium ( runoff would be the waste from watering ).

growgeye said:

Here are the entire plants. Any additional thoughts?
I have been feeding every third watering.
Salt build-up makes sense to me for these reasons: When I watered, there was not a lot of run-off, about a cup. I collected the run-off and added it back during the next watering. I noticed salt build-up in my run-off colletion vessels.

Thank you everyone.

Click to expand...

Organic for well over a year now, easy peasy, too many steps and ingredients in your approach. These nutrient companies try to string us along. It is not anywhere as complicated as they would make it.

I read where adding the runoff back conserved nutrients that could get washed away. It made sense to me before I started feeding and just had the Happy Frog. I continued with this after I started feeding, though.

So it is not a good idea to add the runoff back in any case, correct?

growgeye said:

I read where adding the runoff back conserved nutrients that could get washed away. It made sense to me before I started feeding and just had the Happy Frog. I continued with this after I started feeding, though.

So it is not a good idea to add the runoff back in any case, correct?

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no ….. it has salt buildup in it ( waste )

Its like you taking a piss and drinking it … unless you are into that sort of thing.

No judgement

Should I flush, then?

One more thing suggesting salt build-up. I am using grow bags, and there are white marks on the exterior of the bags.

Honestly they dont look too bad - i would stick with the bloom ( once a week feed to start ) regular watering as needed between. A little EWC added to topsoil wouldnt hurt either. Let the plant work thru excess on its own terms instead of “ scheduled “ feeds.

By watering only as needed you are still diluting the medium but at more slow pace instead by forced gallons.