The sun pulls a different nute ratio than artificial lighting. Every single Led grow I’ve seen is severely deficient in Boron. Been waiting 10 years for someone to be honest about "hash tips. Today everyone has pale leaf tips and thinks it’s nute burn when they go necrotic. All the same issue.
These forums are full of misdiagnosis of calmag or Nitrogen tox, deformities, mutations, bugs, ph rh etc but it’s all boron symptoms. Almost everyone’s problem, seriously. Hash tips, blistering, holes, bent midribs, clawed tips, white tips, purple tops, variation, duckfoot, self topping. It’s all -B.
Instead of fixing the Boron, indoor growers raise ALL nutes. P and K should not be raised indoor, they are not dependent on transpiration. Calcium and Boron are the most affected by poor transpiration. Calcium has been fashionable for a while now. Boron hasn’t. It’s obvious. I’m contemplating selling a few cents of Boron Glycine Stearate in a jug of water for $80 a gallon. But I might just start posting application rates. Literally every indoor “pro” and “breeder” I’ve looked at on Instagram has a blatant Boron deficit staring them in the face.