Tips are burnt - toxicity? Too much light?

Beginner
#1

First time growing from seed.

  • are the tips “burnt” because of too much light (I have the lights adjusted to about 350 par with an 18 hour photoperiod)
  • or perhaps too much nutrients (I want to grow “organically” - I am using wonder soil for the potting soil. I have put in a few drops of fish emulsion as well as liquid seaweed…but a VERY little amount).

Additional questions:

  • for the first month, is there a rule-of-thumb regarding the PAR level as well as photoperiod?
  • it seems my plant is growing much slower than what I am seeing online. I have been watching to not overwater, but I am wondering why it seems the roots aren;t developing as robustly as they should?

Thank you very much for any advice/help!

plant
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#2

Have you been feeding

#3

Thank you for your reply. I did feed a few drops of fish emulsion. and about one drop of liquid seaweed. That is it. The rest I left up to Wonder Soil (https://amzn.to/3j5EWqA)…Perhaps the potting soil is too nutrient rich?

#4

yes…soil is TOO HOT for babies…hopefully they will not stunt…at this point, let them grow…NO Added nutes…nothing but water is needed for min 4 more weeks

#5

Thank you. Is there a potting mix you recommend? I’m thinking the Wonder Soil is too rich.

#6

no, any organic soil can cause burns…Seedlings do not need ANY nutrition until 3-5 weeks old. We try to start them in a blander substrate and transplant to soil when they reach close to the size they are now. Living / organic soils need no (BIG NO) nutrition almost until FLOWERTIME…just ph balanced water

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