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What can cause burnt tips on leaves in flower?

ice minus

Well-known member
tmp1.jpg

What is causing the tips of my plants to turn burnt? I don't believe it to need any more food, it hasn't been a huge feeder and a poor yielder by the looks (I only grew one luckily lol) so I don't think bombarding it with food is the problem or solution

Just curious what I can do to try and remedy this in future grows

Novice here

Thanks for reading!

Strain is Deep 6ix by Lucky 13 Genetics
Black Swallow Living Soil KIS Mix media, 5GAL pot
Lighting HLG-550 LED
 
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ice minus

Well-known member
Looks like lockout. Try to give it less love.

Oh great, this old chesnut again. Lockout.

Story of my life at this point

Probably explains the halt in bud size too, which seems awful

Other strain in my tent is CHUNKY and in smaller pots , less food, less stuff. Frustrating!

Happy new year Mr Padawan
 

ice minus

Well-known member
Before I let you go, This one , a Cotton Candy breeding project from a friend, is fat as hell in comparison but ALSO has the burnt tips

PXL_20250115_064120536.jpg

Could it be a water issue?

I switched to RO with some droplets of Cal Mag for the winter months because my outside faucet where I typically fill my buckets from is shut off for the cold months

Could it need more, or less?
 

ice minus

Well-known member
too much nitrogen...
interesting, I tried to add less food and stuff this time around which is crazy.. I see other grows from "Instagram pros" all the time and let out a "wow" when I see them because they're about to be harvested and so full of nitrogen the leaves are almost black!

I use a product called Black Swallow Living Soil and it sometimes doesn't even need extra food at all, if the pot is big enough!


If it was nitrogen, one would expect much greener foliage.
That's literally to the tee what I thought, too!
 

Grapefruitroop

Active member
Yes, like others said....EC too high.

The plant absorb nutrients and water by osmosis, to do so, she auto regulate the productions of sugars in the roots so that the superior concentration of it attract the molecules of nutrients inside the plant...

When the EC is too high the plant cant produce enough sugars to suck the nutrients and water, so the water goes the opposite way....leaving the plant dehidrated ...hence the burned tips..
A better way to say it is that the burned tips are created by the inability of the plant to suck water due to the high EC in the nutrient solution...:bandit:

Organic living soil can be a bitch under LED because you cant really adjust the nutrient feeding schedule once the soil has been mixed.....hence why when i was growing organics outdoor i was mixing my own soil and always shoot for a quarter of the reccomended dosage as far as fertilizer powders and meals.....
You cannot flush and organic overloaded mix....

For much more control and precision and ability to flush and repair any mistake i switched to coco DTW
 

Ca++

Well-known member
Considerable thinning towards the end of the blades, before burning, is low water movement, K
Red colours often P
No big bottom leaves, removed for vanity? N
Eye like pattern, Ca
Stripes, Mg

That's about everything lacking. Though not as much as my sleep.. I will look again after I get my own 12 hours
 

Grapefruitroop

Active member
Just curious what I can do to try and remedy this in future grows
If you are into organics , keep the nutrients low when mix it or just leave em out so then u can feed em during the grows....there are many styles of growin organic....

This mix never let me down and it gets better use after use...
30% limed peat
30%perlite
30% quaity coco
10% quality EWC

to lime peat i was using a mix made of
1/3 calciumcarbonate
1/3 gypsum
1/3 Dolomite lime
Then u add 1 cup of said mix per cubic foot of Peat.....then mix the peat with the rest...

And is ready to go.....

As far as nutrients...welll.thers a whole lot of options....powders.....liquid....etc but if you are growing indoor under led i would leave any nutrient out of the mix and feed em as you go with liquid solutions....
read the plants and adjust the feeding.......much better than preload the soil and see if your plants like it.....
:bandit:
 

PadawanWarrior

Well-known member
Before I let you go, This one , a Cotton Candy breeding project from a friend, is fat as hell in comparison but ALSO has the burnt tips

View attachment 19132735

Could it be a water issue?

I switched to RO with some droplets of Cal Mag for the winter months because my outside faucet where I typically fill my buckets from is shut off for the cold months

Could it need more, or less?
What have you fed them? And how much? If your plants looked better using outside water it could be something to do with your tap water. Do you have a water softener in your house?
 

Ca++

Well-known member
I would tend to go with a excess of particular nutrient.. (to much)

If it was nitrogen, one would expect much greener foliage.
The most popular reply (by far) is over feed.
I can't see which one it could be. There is good symmetry to this, and over feed is often an accumulation issue. So the oldest leaves, that are off the picture, tend to show first.

I just did a high EC run, with N and K pushed further with every top-up. They were very healthy.
Now I'm doing a slightly high EC run, with no N&K boost, seeing tip burn and some full leaf curl of no particular direction. I therefore suspect I have some signs most would call high EC, but in fact, what I have is probably low K, seen as low water movement. So I am seeing high EC like signs, but really it's a lack of water. My RH has also been 10% lower, which could be another reason, but reason again for low water at the leaf extremities.

I can't help thinking these plants here, are under fed. If there were a few, I would certainly separate a couple to give each different treatment. To see which perked up.
pH, run-off EC, Temp, RH, should all be routine.


Hold up, the penny just dropped. This is soil. They are probably not being watered often enough. My money is on that. Lack of water is like excess salts. Things like P are quick to become unavailable, and may even need soil acids to free them up again. Some forms of N are much less effected, which fits in with the high N observation. The Ca eye leaves and burnt tips. It all points to this soil problem. I had actually missed the fact this thread is in the soil section, or I would of been quicker to suggest this.
 

gmanwho

Well-known member
Veteran
so in the realm of a few things. your tip burn very well could be ec related. BUT, because of a possible " extreme " dry down in comparison to your environment. Or it had an extreme moment to what your plants & roots have experienced, to this point. or what they are capable of. And possibly you never had a over nutrient condition till you had a heavy dry down.

Or possibly looking at it under another light. the dehydration of the once soluble minerals in the medium, then the rehydration, caused an influx of minerals to attach to the h20 an caused a "HOT" feeding. As the moisture returned, the plant was scrambling to replenish moisture in her, she took the hot feed along with the moisture she needed so badly.

its like a salt water puddle and the sun evaporating off the water and leaving the minerals behind.

Or your making a gravy an u add the salt early in the process, now an hour later some of the moisture has evaporated off. The overall h20 volume was reduced, but not the sodium levels. Now grandma ma's complaing its too salty.

An like c++ mentioned. lower water may have caused it

My take is H2O should be considered as part of the whole equation.

Everything within that rootzone adds up to 100% of that total volume. Everything. And technically as the root mass develops your volume is also increasing, and at the same time your other input levels are decreasing. Whatever parts make up your medium, the air or oxygen co2 nitrogen or other off gassing, h20, minerals, roots, bugs an even the microbes. Still should be considered as a whole, 100%.

When this medium and rootzone are at 100% water saturation, and now at a slight water run off, the whole volume of water and the medium is considered one whole.

Without ever adjusting the ec input from that point, whatever is present in the medium at that time, when you lower the water content the ec levels begin to concentrate. Bring it down to a 30% water saturation and your ec could be now 8times of what it was at a 100% water saturation.

I have seen in my soil beds register a 4-6ec with a water only runoff. then 37-42ec at 15% water saturation. this will cause tip burn in my gardens.



The weekly chart below with the first green spike shows me watering in, the moisture spikes to 44% water content. At the same time the ec pink colored line mirrors the moisture, an shows a drop in ec to 11.79ms.

Later to the right hand side of the graph as I went into deeper into my finishing dry downs pushing day 70+, at 13% wtc the ec was up to 40.79ms/cm or 40.79ec.

and yes, in organics not all ec is registered etc etc

full
 
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KIS

Well-known member
Many of these comments all relate to the same issue, which is root hair death. Overwatering and under watering can both cause root hair death and therefore display similar symptoms. In addition, osmotic shock due to high EC can also cause similar issues (drying down increases EC). This looks to me like Ca, which travels in the xylem and is dependent on water movement in the plant. So if your environment is not optimized for transpiration, you could see this sort of leaf tip burn. Or similarly, if you're only seeing it on certain leaves near a fan or area of high air flow, then that's definitely Ca due to rapid evapotranspiration where the Ca is not making it to the leaf tip. Hope that helps!
 

Wolverine97

Well-known member
Veteran
View attachment 19132734

What is causing the tips of my plants to turn burnt? I don't believe it to need any more food, it hasn't been a huge feeder and a poor yielder by the looks (I only grew one luckily lol) so I don't think bombarding it with food is the problem or solution

Just curious what I can do to try and remedy this in future grows

Novice here

Thanks for reading!

Strain is Deep 6ix by Lucky 13 Genetics
Black Swallow Living Soil KIS Mix media, 5GAL pot
Lighting HLG-550 LED
Looks like a simple, fairly mild overfeed. Just cut your nutrients in half for the rest of the way. Burned tips aren't such a big deal. The problem will not continue with lowered nutrients, but the tips already burned will not repair themselves, fyi.
 

Wolverine97

Well-known member
Veteran
so in the realm of a few things. your tip burn very well could be ec related. BUT, because of a possible " extreme " dry down in comparison to your environment. Or it had an extreme moment to what your plants & roots have experienced, to this point. or what they are capable of. And possibly you never had a over nutrient condition till you had a heavy dry down.

Or possibly looking at it under another light. the dehydration of the once soluble minerals in the medium, then the rehydration, caused an influx of minerals to attach to the h20 an caused a "HOT" feeding. As the moisture returned, the plant was scrambling to replenish moisture in her, she took the hot feed along with the moisture she needed so badly.

its like a salt water puddle and the sun evaporating off the water and leaving the minerals behind.

Or your making a gravy an u add the salt early in the process, now an hour later some of the moisture has evaporated off. The overall h20 volume was reduced, but not the sodium levels. Now grandma ma's complaing its too salty.

An like c++ mentioned. lower water may have caused it

My take is H2O should be considered as part of the whole equation.

Everything within that rootzone adds up to 100% of that total volume. Everything. And technically as the root mass develops your volume is also increasing, and at the same time your other input levels are decreasing. Whatever parts make up your medium, the air or oxygen co2 nitrogen or other off gassing, h20, minerals, roots, bugs an even the microbes. Still should be considered as a whole, 100%.

When this medium and rootzone are at 100% water saturation, and now at a slight water run off, the whole volume of water and the medium is considered one whole.

Without ever adjusting the ec input from that point, whatever is present in the medium at that time, when you lower the water content the ec levels begin to concentrate. Bring it down to a 30% water saturation and your ec could be now 8times of what it was at a 100% water saturation.

I have seen in my soil beds register a 4-6ec with a water only runoff. then 37-42ec at 15% water saturation. this will cause tip burn in my gardens.



The weekly chart below with the first green spike shows me watering in, the moisture spikes to 44% water content. At the same time the ec pink colored line mirrors the moisture, an shows a drop in ec to 11.79ms.

Later to the right hand side of the graph as I went into deeper into my finishing dry downs pushing day 70+, at 13% wtc the ec was up to 40.79ms/cm or 40.79ec.

and yes, in organics not all ec is registered etc etc

full
Excellent post, Gman. Much more comprehensive and nuanced than mine. Covered all the bases, good stuff.
 

PlastikeRubba

Active member
Nitrogen doesn't cause "nute burn".

Phosphorus doesn't cause "nute burn".

Potassium doesn't cause "nute burn".


Tldr:
NPK doesn't cause nute burn.

You could grow with potassium chloride, diammonium phosphate and sodium nitrate in coastal manures and be just fine. The people who spout "NUTE BURN" have never calculated the salt index of their fertilizers, I promise.

"Cannabis is a bitch ass weed that hates soil, you need waterponics" - The weed experts before broganics was the hot new scam.

"Cannabis is a bitch ass weed, for recreational drug users, it hates water and needs my special soil moisture meter" - Same fake experts after they stopped running hydro shops and started selling waste scraps on the internet.


Many of these comments all relate to the same issue, which is root hair death. Overwatering and under watering can both cause root hair death and therefore display similar symptoms.

Interesting. I only find root hair death from deficient or imbalanced minerals. Never from some trivial uncontrollable outdoor variable, like weather, that you should learn to work with and stop blaming your customer's problems on.

Every one of you have the same problem. You hate chemistry and love math. There is a $ symbol on the calculator that's why Americans love math (Satan) and hate Chemistry (God)?

20241007_075601.jpg
 

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