What are these dark spots??

JAMO_Grow

JAMO_Grow

Well-Known Member
The plant in the picture displays what I think to be a magnesium deficiency.However I cannot be 100% certain, as I need more information.
What medium are you growing in?
How often are your feedings/watering?
What strength of nutrients are you providing the plant with?
 
Sawzall77

Sawzall77

Well-Known Member
Grown in 1/2mushroom compost and 1/2 pro mix. New soil this year and very rich.

I have other plants thriving in this soil...

Not feeding much as it is new soil...

I water every other day. Sometimes every third day depending on how dry the soil is...

Here’s a pic of other plants in same soil mix...
 

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Sawzall77

Sawzall77

Well-Known Member
Ok I’ll give em a good check for bugs.

I forgot to mention. That plant has an iron deficiency so I think at least. So I did foliar spray with ferrous sulfate heptahydrate. Says it has %20 iron. I did that 2 days ago, maybe that had something to do with those spots?
 
Sawzall77

Sawzall77

Well-Known Member
Hmmm... okay I’m getting a few contradicting answers here lol not sure which way to go....
 
Sawzall77

Sawzall77

Well-Known Member
The spots literally all showed up at once a morning ago. The spots are only on the top growth tips also. 3 days ago, before is used that foliar spray for iron there were zero dark spots
 
Sawzall77

Sawzall77

Well-Known Member
I would have thought it’d be a excessive instead of deficient given it happened after I foliar sprayed
 
Sobeit

Sobeit

Member
Sawzall77 said:
I would have thought it’d be a excessive instead of deficient given it happened after I foliar sprayed
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Excess, leaf tips would burn, new leaves would be chlorotic, you would also see iron,cal-mag def, you have the thin blades.
 
Sobeit

Sobeit

Member
Sawzall77 said:
Hmmm... okay I’m getting a few contradicting answers here lol not sure which way to go....
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I wouldn't think bugs or mag def. The ferrous sulfate heptahydrate will clear chlorosis from the iron. Not exactly sure why it would spot like that after an iron spray. What is the exact color?

phosphorus-leafs.jpg
 
CanadianJim

CanadianJim

Well-Known Member
Some guys on here with dark spots on newer growth apparently had a boron deficiency, but I'm not sure it could show up that quickly.
 
Nutty sKunK

Nutty sKunK

Well-Known Member
Don’t panic!

Plants have anomalies. Don’t react straight away if it is isolated.

If it persists on multiple leaves and growth take action.

You need some magnesium. Epsom salts ;)
 
Sawzall77

Sawzall77

Well-Known Member
This is what she looks like today... it seems the dark spots on the plant are not as noticeable and have faded away sort of. Still sickly looking growth on most of the tops....2955FDF7-3E62-4AE4-A656-BB9952189C99.jpeg
 
raggyb

raggyb

Well-Known Member
Sawzall77 said:
The spots literally all showed up at once a morning ago. The spots are only on the top growth tips also. 3 days ago, before is used that foliar spray for iron there were zero dark spots
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why not iron overdose then? The spots look black and iron is black? Ca and Mg work with iron. Maybe Mg suggested would help with iron uptake too. "Ions with a charge of -1 or +1 tend to be mobile, while ions with a charge of +2 tend to be immobile, Mg++ being an exception." Fe is ++, so immobile I guess. Did you sprayed the tops? Then being not mobile it can't disperse and really concentrated there is a theory. But if you sprayed iron all over then I don't know why it only shows on new growth. If so maybe the higher Mg in new growth because Mg is mobile that new growth steals from the old brings more iron there too. But all this is merely thoughts. I wonder if half MC is too much, but the rest of your garden looks good.
 
Seawood

Seawood

Well-Known Member
Had this last year and if you watch the threads this time of year (flower/pre-flower), you will see similar reports. Fast forward to this year and I am not seeing it. The only difference in my grows is I’ve supplemented with calmag this season. I thought it was a P deficiency last year but think it’s more associated with magnesium. Not sure if MG and P affect each other as in will P uptake be affected by a mag deficiency? Either way, I’m not experiencing it this grow.
 
SwankDank

SwankDank

Well-Known Member
Seawood said:
Had this last year and if you watch the threads this time of year (flower/pre-flower), you will see similar reports. Fast forward to this year and I am not seeing it. The only difference in my grows is I’ve supplemented with calmag this season. I thought it was a P deficiency last year but think it’s more associated with magnesium. Not sure if MG and P affect each other as in will P uptake be affected by a mag deficiency? Either way, I’m not experiencing it this grow.
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did your plants survive cause i have the same issue but worse than the picture showed
 
Sawzall77

Sawzall77

Well-Known Member
SwankDank said:
did your plants survive cause i have the same issue but worse than the picture showed[/QUOTE

It’s only the one plant and yes it’s still very much alive. I think it looks even better today. Gave her some Epsom salts. The dark spots seem to disappear lol I guess it’s a good thing. The growth tips still look pretty awful though lol. I really hope she pulls through and I think she will. I’d be far more nervous if I didn’t have all my other plants thriving like they are! Lol
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