Hey there UFO; first let me start by addressing the plant then I’ll leave a little tidbit at the end. You stated this plant is 22 days old, is in promix HP, and has had a feeding already.
I think this could be your problem.
i don’t know what you fed as it wasn’t mentioned. However I can tell you cannabis seeds have all they need for their first 2-3 weeks of life. There is never a need to feed before week 3 even in a soil with nothing at all in it – and I believe promix has some kind do starter mix already so your plant should be fine with no nutrients of any kind for the first 3-4 weeks in a promix soil.
what can you do? I would recommend you flush heavy as soon as possible. You should put water through your soil until you see a good bit of run off and are confident the entire soil is wet.. then let dry out – I’d repeat this twice and see if it helps at all.
something I can recommend in the future is that when using a soil that has a fertilizer already in it; you might try adding cover crops a week or two before planting cannabis.
then even if your soil runs a bit hot your cover crops should tell you first and take some of the nutrients away from cannabis and or fix them at different points in the soil.
saying sense you say you’re new I wouldn’t try to focus on vpd or par readings much right now. If you have studied lots and know that shit in and out go for it but if you don’t I’d wait to learn about that stuff as it’s a bit complicated and can throw you off when you’re just starting out and have so much to take in.
– Markas
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