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Have you checked your pH levels? Soil is more forgiving than hydro, when it comes to pH levels, but you can still have issues if it's way out of range. If the pH is out of whack, the plant won't be able to absorb and transport nutrients throughout themselves. The end result would have the...

Post some pics of the top of the plant. That's where you want to be looking for ongoing issues.

For future reference, use the GrowWeedEasy plant problems guide. https://www.growweedeasy.com/cannabis-symptoms-pictures

Do you know if it came enriched with ferts? Some have a couple weeks, but maybe yours didn't, which might explain some of the deficiencies we're seeing. Damaged leaves do not repair themselves, so look at the top growth. I'm thinking you need to start adding nutrients.

Is that soil or Coco?

If I can't smell things in here, I definitely have the virus :p

They're growing up so big, just like their big sisters below :p

Huh?

What medium are you growing in? Still looks like a deficiency.

Very nice!

You might want to do a flush, fill with cold water, and then keep that water below 70. Don't overfeed, and make sure your pH is in the correct range. Water temps are really important for roots. I keep mine around 68, and go entire grows without a single flush.

Interesting question.

You would only be using UV light for a few seconds or minutes a day, not all the time.

I remember reading about UV for pest control, years ago. I haven't really heard anything about it recently though.

UVB causes cancer, and I think the only thing UVA does is cause the plant to go from veg to flower much more quickly. I might be off on a couple things though.

Quit trying to make it more difficult for yourself. What you need, in order to grow great plants, is practice. Nothing will increase your yields more than experience. After all that, then try experimenting, when you'd be able to compare yields against each other. Stick with the basics...

No, plants have plenty of practice developing their own roots. They don't need any help. Clones are where you want to look at rooting hormones.

If you get five seasoned growers to agree that it's a good idea, and somehow increases potency, then sure. But you won't.

It does absolutely nothing, and you risk mold/bud rot developing due to the high humidity and not enough heat to evaporate some of the moisture

Especially if one of the beans ends up being a male.