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My seedling has these tan spots ..

Discussion in 'First Time Marijuana Growers' started by Anonymuss54, Oct 19, 2023.

  1. #1 Anonymuss54, Oct 19, 2023
    Last edited: Oct 19, 2023
    I have 4 seedlings, and only one has these; I was afraid it could be a fungal infection so I cut off the affected part yesterday, but now the whole plant is affected.

    I think I may see one spot developing on another plant near it, but I'm not sure.

    Im growing in around 65% coco coir/25% perlite/ 10% worm castings and for some reason the pH had raised to around 8, causing the leaves to be a line green color, so I saturated the (5 gallon) air pots with around 10 gallons of water at a pH of 5.5 til the runoff was around 6-6.5.

    This has all started since watering. I feel like the chances of it being a fungal infection are lower since I used mycorrhizae and mixed work castings in. Is it likely this is a symptom of overwatering? If so what can I do to help oxygen get to the roots and help it dry out faster?

    If tan spots developing on the true leaves (cotyledons still look perfectly healthy and dark green) isn't a symptom of overwatering, what could it be?

    *Edit: I also mixed a dose of calmag into the last gallon of water and watered with that before I finished, I assumed I might as well as I won't be watering again for a while. I feel like 1 dose of calmag dispersed among 4 plants shouldn't be enough to cause nutrients burn
     
  2. have you grown in coco before or is this your first time?
     
  3. Never use plain water in coco.
    Feed daily to substantial run off.
    Never let it dry out.
     
    • Agree Agree x 1
    • Funny Funny x 1
  4. They're seedlings
    And the problems only arose *after* watering
     
  5. I neglected to mention to only feed daily to run off once it has established roots.
    I start in solo cups and start feeding daily after 3-4 days from sprout.......then transplant after two weeks.
    If you started your seedlings in a large pot..........maintaining the correct moisture level will be a challenge.
    Your main problem is that you ran 10 gallons of plain water through the coco, messing up the CEC.
    Good luck.
     

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