Weird problem persists; leaves browning from center outwards

Are you supplementing calcium? Seems like this has been a battle the whole grow.

Same light?

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Yes, as I mentioned in this new post, it’s been plaguing me the entire grow and I’ve been using cal-mag blended as per it’s directions ever since being advised to do so on that original post I just linked you to. Same light also, yes. I thought it could be light burn, but I was told the light I had could even be considered underpowered for this single plant so I wrote light burn off. Driving me crazy I can’t identify the issue!! :pensive:

I wouldn’t, I’ve had a blurple and I was able to burn a plant or two. But I also didn’t see in any of your old pictures unreasonably close to the plants. Unless you got less than 18” inches I really don’t think it’s light burn.

I do believe you that you’re feeding calcium, but I’m seeing what looks like a calcium shortage since the beginning. Something must not have changed between then and now.

I’ll tag a few others for input.
@dbrn32 @Myfriendis410 @MattyBear @MrPeat @Hellraiser

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That does look like light burn to me.

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Calcium def along with possible potassium (K): I say that because K regulates temperature at the leaf canopy and those are definitely burned.

Did you do a Support Ticket? Lets see what you have.

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
  • Method: Soil w/salt, Organic soil, Hydroponics, Aquaponics, KNF
  • Vessels: Pots, Grow beds, Buckets, Troths
  • PH of Water, Solution, runoff (if Applicable)
  • PPM/TDS or EC of nutrient solution if applicable
  • Indoor or Outdoor
  • Light system
  • Temps; Day, Night
  • Humidity; Day, Night
  • Ventilation system; Yes, No, Size
  • AC, Humidifier, De-humidifier,
  • Co2; Yes, No

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

Add anything else you feel would help us give you a most informed answer should be included. Feel free to elaborate, but short and to the point questions and facts will help us help you in a more efficient manner :slight_smile:

Thanks!

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(And also to @MrPeat)

I thought it could be light burn but in my other post looking for help with this problem I was told the light is underpowered and recommended I buy more powerful lights. You can understand how being told I had underpowered lights on here lead me to believe there was no way it could be light burn. You can also see in that linked thread how high my light is from the plant (pretty high up, IMO). The plant exhibited these issues both with the light on only veg switch and with veg + flower switches both on.

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As requested, “Support Ticket” info:

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
    “THC Bomb”

  • Method: Soil w/salt, Organic soil, Hydroponics, Aquaponics, KNF
    50% FoxFarm Ocean Forest, 25% FoxFarm Coco, 25% Lava Rock; blended in 4:4:4 organic fertilizer as per it’s instructions and myco as per it’s instructions. Later top-dressed with dolomite lime as per advice here.

  • Vessels: Pots, Grow beds, Buckets, Troths
    3gal fabric pot

  • PH of Water, Solution, runoff (if Applicable)
    Water PH is 6.0-6.5 (distilled with cal-mag added), runoff is 6.5. TDS of runoff at last measurement was 1554.

  • PPM/TDS or EC of nutrient solution if applicable
    N/A

  • Indoor or Outdoor
    Indoor tent.

  • Light system
    Phlizon LED Grow Light

  • Temps; Day, Night
    Day avg 74-78, Night avg 68-72

  • Humidity; Day, Night
    Day avg 50%, Night avg 60%

  • Ventilation system; Yes, No, Size
    Tent is located in spare bedroom, no central air.

  • AC, Humidifier, De-humidifier,
    AC running 24/7 set to 72, De-humidifier running 24/7 set to 50%.

  • Co2; Yes, No
    Yes, hanging Exhale bag above tent air intake path.

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To me it does look like light burn. I’ll wait to see what others have to say.

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Through looking around I’d like to say a PH fluctuations added an image for reference this said it could be accompanied with a magnesium/calcium deficiency no expert just calling what I see .incorrect-ph-cannabis-sm (1)

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It’s possible your medium is sequestering calcium so one easy thing is to up the cal mag dose or frequency. I don’t see anything else that jumps out at me right now. Light burn is a possibility as stated so keep your distances and watch for stretching.

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The patterning is somewhat similar in the leaves you’ve pictured there, but those look to be yellowing prior to browning. Mine actually darken to a very dark green, almost black before turning brown. I’ve taken some new photos I’m going to post below. Thank you for chiming in, appreciate the help!

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Can you explain to me how we went from your advice that my light is underpowered to could be light burn? This issue has existed the entire grow, as you know.

Under powered light too close to plant will absolutely cause light burn.

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Opened the tent today to find the problem getting much worse. I’m pretty bummed at the moment.

I have taken new photos showing its current state as well as light positioning above the plant as it’s been.

I also took a photo showing the early signs of the issue, you can see the leaf turns very dark before turning light brown, no yellow is involved. I also noticed, this symptom is happening on leaves which are shaded/covered, even at the bottom of the plant, so how could that be light burn?

I’ve increased watering to every 2 days and added an extra shot of cal-mag to the water.

If it’s a calcium deficiency, what could cause the plant not to uptake enough since I’ve been dosing with calmag the whole time with no changes?

You’ve seen the light position though, it’s not too close. How can an underpowered light cause light burn? I’m trying to learn. “Light burn” to me reads as though you have to have too much, like sun burn on a human. So if a light is underpowered and not ridiculously close, how could light burn result? How can light burn happen on leaves underneath the canopy which are shaded?

No; you have something else going on. It really looks like Calcium and all I can figure is you have a hungry cultivar, and something in your soil blend is sequestering calcium. You also could have a root bound plant that is starving for nutes but your runoff TDS of 1,500 ppm says differently. If you had a PH lockout that would be an issue. Have you had a departure from nominal pH at some point? Really that is all I can think of.

No departure from nominal PH besides the original 5.0-5.5 and then top-dressing with the dolomite lime as you also advised. Soil PH is 5.5-6. I was, however, told in person by another grower that you don’t monitor the PH of FoxFarm soil because it’s pre-adjusted. They said with a soil like that, it should just be lighting and watering. They said substituting 25% of my content with coco and lava rock could have resulted in nutrient deficiencies, but as mentioned, I originally blended 4-4-4 to compensate for that and have been feeding cal-mag for more than 50% of the grow. Based on my initial research, the soil I had blended should have not needed anything for the plant. These symptoms, however, have remained identical regardless of how I react and have persisted the entire grow.

Could under-watering result in these symptoms? Is watering every Wednesday and Sunday not enough? What could prevent the plant from using available calcium in the soil? If I have a “hungry” plant, how do I know how much cal-mag is too much? With the plant in the stages of flowering that it is, and how it’s looking right now, can I save it? What do I do now? :confounded:

Good afternoon @ThisHighUp your most welcome just trying to help like I said I’m no expert nor do I have the experience a lot of these guys have on hear but I will try my best I dont guess I research and then give the information I’ve come across so hopefully it helps lol😆

@Myfriendis410 has a grate point about root bound plant if your plant is root bound it may be pulling nutrients, but at a reduced rate and may only be pulling certain nutrients and leaving subsequent nutrients behind ie calcium,zink and other trace elements could be left behind while your lady puts everything into flowering. And as he mentioned ph lockout I refer back to my previous comment on ph fluctuations,

I’ve had a good look at the images you uploaded can’t see anything wrong with the set up lights ect so I’ve done some further research to see if I could identify this problem from another source


To my self the areas I’ve highlighted are yellowing and showing deficiency the Browning patterns I’ve never seen anything like before by deficiency normally caused by light or heat stress or wind burn to close to a fan but you fan isn’t close enough for that unless previously closer.

But while researching I come across these images relating to a potassium deficiency

Hopefully this is of help to you stay safe

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Thanks again for the reply!

What’s throwing me, is that all the deficiencies like that seem to illustrate yellowing, and occur on the edges. This symptom has literally zero yellow involved; just darkens, then turns brown. I think the yellow hue you saw in my photo was from the flash shining off the leaves. Here is a close up of the right leaf you circled in my photo, you can see today it began turning brown, no yellow and it starts in the middle of the leaf, not the edges:

I understand the thinking of being root bound, however as mentioned this problem has existed the entire grow once it was transplanted and moved under the LED, even when it was a tiny plan in a big 3 gallon pot. So, I don’t think it’s because the plant is root bound. The last and only time this plant looked proper green and happy, was when it was root bound in a coffee mug on my window sill getting crap natural light. I can’t believe it was doing better under those circumstances than in a proper setup with care and attention.

That center leaf in the picture with the interveinal chlorosis is yellow and is calcium deficiency.

@dbrn32 @Covertgrower @repins12

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