What causes leaves to look like this?

These are my 2 Amaretto plants i have.
I checked this morning and have some discoloration on the leaves. I haven't fed the last 2 waterings. Been plain water. Happy frog soil.
Any ideas? Overwatering? Light burn? Need cal mag?

Likely a phosphorus deficiency.

I also forgot to mention yesterday it was pretty cold in the room so i put the soace heater on like a foot away from the plants and left it on for like 5 minutes by accident. Maybe it could be from that. I also put them into flower a week ago so they could need some P.

Azubaz said:

Maybe it could be from that?

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Not likely Az. The discoloration on your leaves follow a specific pattern. Leaf tips and margins. Heat burn wouldn't do that I don't believe.

Most nutes have plenty of everything needed to grow marijuana. So deficiencies are quite often from lockout or more specific chemical interactions. You're gonna have to tell us the full story unless you just want guesses...
JD

JohnDee said:

Not likely Az. The discoloration on your leaves follow a specific pattern. Leaf tips and margins. Heat burn wouldn't do that I don't believe.

Most nutes have plenty of everything needed to grow marijuana. So deficiencies are quite often from lockout or more specific chemical interactions. You're gonna have to tell us the full story unless you just want guesses...
JD

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Hmm well they are maybe a month old now, they were locked out early on, i had fed to much nutes and over watered. After flushing for a little and repotting they starting looking great. I put my lights to 12/12 about a week ago. If i remember right my last 2 waterings have been plain water, plain tap water. So last i fed them was maybe 2 weeks ago. I have AN over drive which is usually what i use for my flowering nutes.

How is you're tap water? Super hard? Do you measure ph and EC of feedings or are you using the shotgun approach (not judging here) Oh and a little about the soil too.
JD

something is defidently locked out test your soil ph I guess?

JohnDee said:

How is you're tap water? Super hard? Do you measure ph and EC of feedings or are you using the shotgun approach (not judging here) Oh and a little about the soil too.
JD

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Shotgun approach. I just use Happy Frog soil. I don't believe my tap water is hard. I usually don't have to add any cal mag to it. I always use it with no problems like such.

They could be locked out maybe but from what i understand that is from nurtients and i haven't used some in the last couple feeds.

If it is short on some P should i add some next feed?

I'm just guessing here ...poor watering habits?

I have 3 plants in total, only 2 look like this. It's minor and only affected on certain leaves. When i had the space heater on yesterday it was only facing the 2 plants affected. The heater was on a pretty warm setting. Next day they are immediately affected and other plant is fine. Though i did water the 2 plants affected the day before. So i suspect either heat burn or over water.

Herb & Suds said:

I'm just guessing here ...poor watering habits?

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I think it's how i been watering. I think they are over watered and it's effecting the roots.

that's def heat burn bc I see its just on one side of the plants how close was the heater

as long as you see new growth you'll be fine

Azubaz said:

Shotgun approach. I just use Happy Frog soil. I don't believe my tap water is hard. I usually don't have to add any cal mag to it. I always use it with no problems like such.

They could be locked out maybe but from what i understand that is from nurtients and i haven't used some in the last couple feeds.

If it is short on some P should i add some next feed?

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AZ,
Phosphorus absorbs at a fairly high PH...so a little soil acidification from salt build-up would/could cause that P malabsorption. Just adding more P might not do it if it's being locked out.

One reason guys ad mycophizzal bacteria and fungus (bennies) is that it promotes better P absorption. So here's the plan...add some benificial bacteria (sorry I don't have any products immediately in my head)
Start feeding...like maybe water water feed repeat. With good drying in between. Go with low dose nutes and build up. That's what I'd do...
JD

Gond00s said:

that's def heat burn bc I see its just on one side of the plants how close was the heater

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On both plants it's only on one side so that's what i think it's from the heater honestly i forgot to mention it's only on one side. Plus i had them really close like a foot away like an idiot

Azubaz said:

On both plants it's only on one side so that's what i think it's from the heater honestly i forgot to mention it's only on one side. Plus i had them really close like a foot away like an idiot

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You get one demerit for ommitting that info...
JD

Looks like heat damage I would trim off the damage parts and stick to water and reevaluate in few days feed ect

JohnDee said:

You get one demerit for ommitting that info...
JD

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Should i not have?

Azubaz said:

Should i not have?

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just don't put your heater facing or near your plants and you'll be fine they'll come right back

Gond00s said:

just don't put your heater facing or near your plants and you'll be fine they'll come right back

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They were like 1 foot away when i had the heater on. Yeah ill see within a couple days how they look.