Potash Deficiency?

adrenalytic · Feb 20, 2019

Hi All,

I just started bloom less than a week ago on some girls and they are developing these rust spots and burnt leaves. I'm guessing potash deficiency but figured I'd ask the experts what their thoughts were. Thanks.

Logan Burke · Feb 20, 2019

I'm definitely not an expert but I'm glad to chip in lol. Could we get a picture of the whole plant please? Are leaves all over affected, upper leaves, lower leaves? What nutrients are ya using? I'm guessing you're in soil? Some of this info will encourage some of the vets around to chip in.

adrenalytic · Feb 20, 2019

Logan Burke said:
I'm definitely not an expert but I'm glad to chip in lol. Could we get a picture of the whole plant please? Are leaves all over affected, upper leaves, lower leaves? What nutrients are ya using? I'm guessing you're in soil? Some of this info will encourage some of the vets around to chip in.

Yes, leaves all over are affected, upper and lower. This is on multiple plants inside the tent, however the plants outside are not affected so my elementary hypothesis is that the move to bloom cycle has increased the plants' hunger for more potassium.

I'm currently giving Sensibloom Pt. A&B, Hygrozyme, Roots Excelurator, Miracle Grow (half strength although I'm considering dropping this entirely for bloom). I just started adding Bud Candy last night but that's not a factor as the symptoms were there prior.

And I am growing in Promix HP with mychorrizhae. Here's more pics.

This one is of all four plants I'm flowering.

This one seems to affected in particular.

Thanks in advance for any help.

NwGKenny · Feb 20, 2019

You are probably over feeding. I have never used promix so I can't comment with certainty on this issue.

hotrodharley · Feb 20, 2019

Drop the Miracle Gro immediately. You're double feeding. You might have lockout.

3rd Monkey · Feb 20, 2019

Stupid questions.

Do you have those pots raised up or sitting on anything?

Do you let your runoff just lay on the floor?

Beachwalker · Feb 20, 2019

adrenalytic said:
Yes, leaves all over are affected, upper and lower. This is on multiple plants inside the tent, however the plants outside are not affected so my elementary hypothesis is that the move to bloom cycle has increased the plants' hunger for more potassium.

I'm currently giving Sensibloom Pt. A&B, Hygrozyme, Roots Excelurator, Miracle Grow (half strength although I'm considering dropping this entirely for bloom). I just started adding Bud Candy last night but that's not a factor as the symptoms were there prior.

And I am growing in Promix HP with mychorrizhae. Here's more pics.

This one is of all four plants I'm flowering.

View attachment 4286282

This one seems to affected in particular.

View attachment 4286283

Thanks in advance for any help.

We can talk about what you're feeding in a minute but can you tell us about your pH ?

adrenalytic · Feb 20, 2019

3rd Monkey said:
Stupid questions.

Do you have those pots raised up or sitting on anything?

Do you let your runoff just lay on the floor?

They are not raised, however, I always clean my drain plates after every feeding. I don't ever let them sit in it over night.

adrenalytic · Feb 20, 2019

Beachwalker said:
We can talk about what you're feeding in a minute but can you tell us about your pH ?

pH going in is always 5.9-6.1. pH coming out is always near the 4.9 to 5.5 range. The Sensibloom is pH perfect so I don't need to test it but I always do. I am using Blue Lab pH and EC probes (EC is always between 1.7 - 2.0 going in).

adrenalytic · Feb 20, 2019

hotrodharley said:
Drop the Miracle Gro immediately. You're double feeding. You might have lockout.

Will do. It was a nice cheap crutch for veg but I see what you mean.

Bobby Long Buds · Feb 20, 2019

Why are you using Sensi bloom and miracle grow? These are both complete foods buy themselves. Although nobody recommends miracle grow anything. Even there perlite is frowned upon haha

hotrodharley · Feb 20, 2019

I have grown more than a few great plants using the Miracle Gro crystals. It even has micros like Cu. I mean complete grows and a lot of them. It was all we could get in the 60's. It's easy to overfertilize with it.

adrenalytic · Feb 20, 2019

Bobby Long Buds said:
Why are you using Sensi bloom and miracle grow? These are both complete foods buy themselves. Although nobody recommends miracle grow anything. Even there perlite is frowned upon haha

Because this is my first grow? I'm sure you do all of your grows perfectly every time (even the first), but for some, there is a learning curve.

hotrodharley · Feb 20, 2019

Jobe's plant spikes for guerilla grows.

adrenalytic · Feb 20, 2019

hotrodharley said:
I have grown more than a few great plants using the Miracle Gro crystals. It even has micros like Cu. I mean complete grows and a lot of them. It was all we could get in the 60's. It's easy to overfertilize with it.

Yeah, it was great for the first two months of veg. I'm still going to use it for future grows. Just going to be more mindful of what I'm mixing it with.

Bobby Long Buds · Feb 20, 2019

adrenalytic said:
Because this is my first grow? I'm sure you do all of your grows perfectly every time (even the first), but for some, there is a learning curve.

Sorry but it was a serious question that I thought you might have a perfectly good answer for. I assure you I frigged up every grow in some way especially the first few.

hotrodharley · Feb 20, 2019

adrenalytic said:
Yeah, it was great for the first two months of veg. I'm still going to use it for future grows. Just going to be more mindful of what I'm mixing it with.

In veg just use that. It's a complete plant food.

3rd Monkey · Feb 20, 2019

adrenalytic said:
They are not raised, however, I always clean my drain plates after every feeding. I don't ever let them sit in it over night.

Is it possible that water is sitting in the bottom of your pots?

adrenalytic · Feb 20, 2019

Bobby Long Buds said:
Sorry but it was a serious question that I thought you might have a perfectly good answer for. I assure you I frigged up every grow in some way especially the first few.

No worries mate. Nope, I had no clue they couldn't be used together. Live and learn :wall:

hotrodharley · Feb 20, 2019

Recommended a decent EC meter. Screw pH meters. Litmus paper is just fine for our purposes. But an EC meter helps you control your feeds. To help you increase them etc.

And to decrease them. Especially in flower.

Potash Deficiency?

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