Fan leaves brown and dying during flower

bythelake

Member
I’m on my third crop and getting better with each one, but I’ve had an issue with each crop where one or two of my plants starts looking really sad about 4 or 5 weeks into flower. Fan leaves start to yellow from the center vein, then brown, moving outward until the whole leaf eventually goes brown and dies. Late in flower, I’ll have some of the bud leaves brown a bit too (I’ve heard it referred to as foxtails?).

is this normal/common and having to do with the flowers pulling all the nutrients from the leaves? If so, is bumping my nutes past the bottle dosage the right move?
Or, does it sound like a specific nutrient deficiency or other problem? Keep in mind, some plants look awesome and they’re getting the same nutrients exactly. That leads me to believe it’s a plant specific need/deficiency, but I’m still at kindergarten level trying to figure this out on my own. Thanks in advance.
 

HydroKid239

Well-Known Member
Pics?
Feeding schedule/product line?
environment? (Temps?rh)
medium?
Need more info for anyone to help once they get here.
 

bythelake

Member
Running General Hydro Flora Nova Bloom, Kool Bloom and Floralicious. Temps in the tent are running 90 to 95 when the lights are on, air flow is good. They’re in 3 gallon grow bags with Ocean Forest soil. This is all in a 4x4 tent with 4 LED (1000w “equivalent”) lamps.
 

twentyeight.threefive

Well-Known Member
I’m on my third crop and getting better with each one, but I’ve had an issue with each crop where one or two of my plants starts looking really sad about 4 or 5 weeks into flower. Fan leaves start to yellow from the center vein, then brown, moving outward until the whole leaf eventually goes brown and dies. Late in flower, I’ll have some of the bud leaves brown a bit too (I’ve heard it referred to as foxtails?).

is this normal/common and having to do with the flowers pulling all the nutrients from the leaves? If so, is bumping my nutes past the bottle dosage the right move?
Or, does it sound like a specific nutrient deficiency or other problem? Keep in mind, some plants look awesome and they’re getting the same nutrients exactly. That leads me to believe it’s a plant specific need/deficiency, but I’m still at kindergarten level trying to figure this out on my own. Thanks in advance.
Do they look like this?

potassium-deficiency-cannabis-1.jpg

Potassium deficiency.

Also that's really hot in the tent. Find a way to lower the temps.
"Note: Sometimes a cannabis potassium deficiency (like all deficiencies) can be triggered by stressful conditions (for example overwatering, heat, transplant, etc) and may clear up on its own after the period of stress is over. "
 

HydroKid239

Well-Known Member
Running General Hydro Flora Nova Bloom, Kool Bloom and Floralicious. Temps in the tent are running 90 to 95 when the lights are on, air flow is good. They’re in 3 gallon grow bags with Ocean Forest soil. This is all in a 4x4 tent with 4 LED (1000w “equivalent”) lamps.
how much of the recommended dose do you feed it?
 

HydroKid239

Well-Known Member
You may be giving it more N that she wants and it's burn. If you're feeding her, there's no reason for her to use her plan B to feed.
 

bythelake

Member
I should also mention that it always starts on the biggest colas with the biggest buds, then spreads as the lower ones are maturing. This also makes me think the buds are just pillaging the leaves, but I want to give themwhat they need so they don’t have to do that every time.
 

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HydroKid239

Well-Known Member
I'm no pro, but it looks to me like you burned her. That's a sick burn on the leaves. Feed ph'd water only for the next couple of waterings. Watch new growth/leaves. Those leaves are scrapped. They will fall off if you don't pull them.
 

bythelake

Member
You may be giving it more N that she wants and it's burn. If you're feeding her, there's no reason for her to use her plan B to feed.
Hmm...I’m going full late flower dosage. So 2tbsp per gallon of the Flora Nova, 1 tsp per gallon of the Kool Bloom and 1/4 tsp per gallon Floralicious.
 

HydroKid239

Well-Known Member
pull her out the pot when she's drying up and check out her roots, but do it in very dim light. Make sure the roots are all white. Brown roots = FKD. I'm not sure how to bounce back from that.
 
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