Spots on my cannabis plants

franklygrown · Jul 13, 2025

Knight007 said:
Seems like it is I had a friend come around and take a look who’s been doing it for years, turns out I was using a light mix and didn’t add enough cal/mag, thanks mate appreciate the feedback

Dude, I'm just glad I'm right. I'm finishing my first grow, I'm a novice too.

Knight007 · Jul 13, 2025

franklygrown said:
Dude, I'm just glad I'm right. I'm finishing my first grow, I'm a novice too.

No way, spot on you must be deep in your research. You got pictures of your grow?

franklygrown · Jul 13, 2025

Pink Runtz
Using a 2×4×5 vivosun kit
mostly Fox Farms with some added Nitrogen and Epsom salt.
Ph around 5.8-6.6
I did that ADHD deep dive and it all just clicked, I suppose that's a green thumb.

Randyy · Jul 13, 2025

Knight007 said:
Okay so update couple days later, she now looks like this I checked the PH and realised it was at 7.2 so I need a flush with just pure water at 6.2 which is recommended, but now i seem to be having the same problems in the other plants that I have too any suggestions :/

My suggestion would be to just add a little patience.

Give the plants some time to recover and see if the problem gets worse. In particular, notice how the new growth looks. The leaves that are already damaged won't ever turn green and look healthy again, even though the plant is in recovery. So to see if the PH adjustment fixed the issue check the new growth and see if that looks healthy.

I saw someone suggested that it's a cal mag deficiency. Not saying that it's not, but I think it would be unwise to make too many changes at one time because it will be more difficult to determine which changes did what for the plant. If it was only a PH problem then you don't wanna create a new problem by overdosing with unnecessary fertilizer. I use BioBizz myself, also with the light mix and I never add any cal/mag to my plants at any stage of the grow! I do have some rather hard water here though, so that might be why I don't need it.

Knight007 · Jul 13, 2025

Randyy said:
My suggestion would be to just add a little patience.

Give the plants some time to recover and see if the problem gets worse. In particular, notice how the new growth looks. The leaves that are already damaged won't ever turn green and look healthy again, even though the plant is in recovery. So to see if the PH adjustment fixed the issue check the new growth and see if that looks healthy.

I saw someone suggested that it's a cal mag deficiency. Not saying that it's not, but I think it would be unwise to make too many changes at one time because it will be more difficult to determine which changes did what for the plant. If it was only a PH problem then you don't wanna create a new problem by overdosing with unnecessary fertilizer. I use BioBizz myself, also with the light mix and I never add any cal/mag to my plants at any stage of the grow! I do have some rather hard water here though, so that might be why I don't need it.

Thanks for the added perspective dude, sounds like a level headed approach, I’ll try keep patients see what I can go and go from there, thanks a lot man

Knight007 · Jul 13, 2025

franklygrown said:
Pink Runtz
Using a 2×4×5 vivosun kit
mostly Fox Farms with some added Nitrogen and Epsom salt.
Ph around 5.8-6.6
I did that ADHD deep dive and it all just clicked, I suppose that's a green thumb.

Fair play dude then girls look serious! Is the fox farm’s nutrition organic?

Randyy · Jul 13, 2025

Knight007 said:
Thanks for the added perspective dude, sounds like a level headed approach, I’ll try keep patients see what I can go and go from there, thanks a lot man

Cool man, let me know how it goes.

RootFarmer · Jul 13, 2025

ArtfulCodger said:
You might check the undersides of the affected leaves with a magnifier, looking for bugs. Just to rule it out.

This is good advice. It looks a lot like mite damage.

franklygrown · Jul 13, 2025

Knight007 said:
Fair play dude then girls look serious! Is the fox farm’s nutrition organic?

Their trio and Sledgehammer some of which is organic, but not all. I use a non-organic nitrogen supplement, the basic AB two part solution. Med/heavy predawn watering three times a week, a quick shot of moisture for a few minutes each morning a couple hours after dawn. Used lst clips low, net higher up. Now I wait for tricomes to ripen/amber a bit before i cut and hang.

Spots on my cannabis plants

Spots on my cannabis plants

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