Burnt curling tips? Need any advice or tips to save please!

Hello all!

Just reaching out because I have some things going on with my first solo grow that I am not sure how to fix. It appears my leaf tips are burnt or dying?
When I first noticed it they were just yellow and curling. So I adjusted the light and lessened my watering only when it needed it type thing. I was using filtered tap water from a jug no ph tester so I just let it sit till room temp and poured in. Just recently I switched to tap water but I let it sit out for 24hrs and I also added Reeferitilizer grow to it, she perked up and grew more shoots at the top. But she looks like she still is having tip issues.
I have the humidity sitting around 60-80% I have an exhaust fan going when the light is on and turn it off when she sleeps also one fan for air circulation.

Strain type is King Sherb pulled out a GhostDrops bud. She took and is fem so I really wanna save her/clone her.

Please lend some advice as I am totally at a stand still. Also reference pictures attached, looks like it’s getting worse.


We will need a bit more information before being able to help you properly:

COPY/PASTE the below list into your forum post.

Answer these simple questions the best you can.
If you do not know, or do not use something; Just say so; Or post
NA (non applicable)

-What strain, Seed bank, or bag seed (photo or auto)
-Age of plant
-Method: Soil w/salt, Organic soil, Hydroponics, Aquaponics, KNF
-Vessels: Type and capacity of container (fabric, plastic, etc)
-PH and TDS of Water, Solution, runoff (if Applicable)
-PPM/TDS or EC of nutrient solution if applicable
-Method used to measure PH and TDS
-Indoor or Outdoor if indoor, size of grow space
-Light system List brand and wattage/spectrum
-Actual wattage draw of lights
-Current Light Schedule
-Temps; Day, Night
-Humidity; Day, Night
-Ventilation system; Yes, No, Size
-AC, Humidifier, De-humidifier,
-Co2; Yes, No

If growing Hydro some additional questions:

-DWC? RDWC? Autopots? Ebb and Flow? Other?
-Distance of liquid below net pot (DWC)
-Temperature of reservoir
-TDS of nutrient solution
-Amount of air to solution

Always try to upload a clear picture in white light of any issues you may have to allow the community to assist you.

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-What strain, Seed bank, or bag seed (photo or auto): King Sherb, Ghost Drops.
-Age of plant: two months.
-Method: Organic soil, added nutrients for growth Reefertilizer Grow added to 4L of water.
-Vessels: fabric container, 7gal I believe.
-PH and TDS of Water: NA
-PPM/TDS or EC of nutrient solution if applicable:NA
-Method used to measure PH and TDS: NA
-Indoor or Outdoor if indoor, size of grow space: Indoor, 2ft by 2ft by 10ft black box tent
-Light system List brand and wattage/spectrum: HGL something referenced to it from here. Full spectrum.
-Actual wattage draw of lights: NA
-Current Light Schedule: 16hr light 8hr complete darkness.
-Temps; Day, Night: roughly 19-22 Celsius.
-Humidity; Day, Night: Always around60-80%
-Ventilation system; Yes, No, Size: Yes, 10 inch ventilation fan and a 6 inch fan for circulation.
-AC, Humidifier, De-humidifier,: NA
-Co2; Yes, No: No

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What brand of nutrients and at what dosages?


Nice large plant , are you watering to a run off at this point ? I would check the p p m run off. If your number’s high water only the next couple times with p h water only.

Looks like you are over feeding on your nutes run plain ph water for a few days check run off once ppm are below 1000 start feeding again

I just gave it nutrients for the first time on Wednesday. It was looking like this before added nutrients, but it grew new shoots when I added some. I am using Reefertilizer Grow, following the given instructions.

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A good place to start would be at the PH. If the ph is in range then we can eliminate nutrient lock out (high ph) as the cause. And know it’s a deficiency. If it’s just a ph lock out, and you fertilize, once it’s back into range it will severely burn your plants and have a bad yield and quality.

Find the PH of your tap water.
Find the ph of your nute solution after you mix it up.
Find the ph of your runoff if you water over a tad once.

Comparing these to each other will point you in the right direction.

If tap is above 6.8 then probably nute lock. High ph causes the nutrients to bind up into a solid rock form plants can’t use. No matter how much you feed the plants are locked out.

If ph of nute mix is high then the nutes are shifting the ph up. You must ph down it before feeding the plants.

If the runoff is above 7, then the soil mix is too alkaline (least likely in commercial mix) and a ph down should be used at watering.

I would suspect that the tap water is a tad high for the cannabis. That’s where I would start.


As @noddykitty1 mentioned above, start with ph. In veg you want your numbers between 6.3 and 6.5 for optimal nute uptake during veg. When she starts to flower, thats when the range swaps to 6.5 to 6.8 for optimal nute uptake for flowering. I agree that its possibly ph related and maybe even a little shock since you changed you water. I ran into this a few grows ago because i was experimenting with the aquarium water chlorine remover which tanked my ph and locked me out. Once i was able to get that under control then everyone recovered and it was a decent harvest. Keep in mind that cannibas friendly soil is already loaded with nutes and at 7 gallons, you should be good for at least 45 days from sprout. Definately get a PH and TDS meter for situations like this. I have a set shoved in a drawer somewhere.

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Looks like the top 1/2 of your plant has the tip yellowing/burn. Could be heat related. What are your temperatures inside and outside your tent?

Also I check the Nutrient website for information on this product. They have a nice AI interface to chat with. I submitted your original question, ‘It appears my leaf tips are burnt or dying?’.
And here is the reply.

“It’s possible that your plants are experiencing nutrient burn, which occurs when there are too many nutrients in the soil. This can cause the tips of the leaves to turn yellow or brown and curl upward. If this is the case, you should stop feeding your plants and flush them with pH neutral water for a week. Then, gradually start feeding them again with a lower amount of nutrients. On the other hand, if the leaves are turning yellow or brown and becoming dry, this could be a sign of nutrient deficiency. In this case, you should check the pH and TDS of your soil and adjust accordingly. It’s important not to overfeed your plants, as this can make nutrient lockout worse.

SOURCE: https://reefertilizer.com/blog/how-often-should-i-feed-and-water-my-cannabis/


I feed twice a week to run off with nutes pHed at 6.5… In between i water lightly with Recharge/Tribus Original mix pHed again at 6.5.

Lightly being only about a cup or two of solution right at the base of the main stem.

Making sure to allow it to dry enough between feedings and waterings.


@Fiefie can you repost the bottom pic of the nutes excessive and deficiencies…when i click on it its not a pic like the top 1 …i wohld love to have that as a guide

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I have this one.


Tried… Still posts just an image… Weird.

@Covertgrower is there a way to or reason some pics uploaded are click able whole others just show a pic? Anything I can do?

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Searched to find a better version to try to upload… All bad.

This is the best I can do:


I don’t believe so. It’s on the forum end the way things get uploaded.

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