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Temperature and the intensity of the light. As the angle of the sun changes the lumens will increase.

That’s a monster if you are growing it without artificial light. Especially this time of year.

Loss of flower from side branches but done properly nothing but big top colas. At least from my experience. More weight per crop.

They don’t look overwatered to me. But I’ve got no experience with the watering system you’re using.

https://www.zamnesia.com/grow-weed/515-potassium-deficiency

Are you feeding these yet? They’re from plants that were being fed I’m sure. Phosphorus deficiency.

With LED go for higher temperatures and settle for the lower humidity. If you have to choose one or the other. Above 80 for sure during lights on.

No idea on the actual science but it seems using LED increases demand for magnesium. At least in my experience using LED. You can apply foliar spray. 1 tablespoon of UNSCENTED Epsom salts in a gallon of water. I add a drop or two of Dawn dishwashing soap but any liquid soap will do. Acts as a...

Haven’t seen him around. Sent a DM but no reply.

Dutch Passion Durban is not landrace Durban. Glad you pointed this out.

Magnesium deficiency

I agree. I maintain an IBL Durban and you’re looking at about 85 days of flowering.

You mean X? I’m wondering what happened with him. The champion for citric acid.

If you are super concerned you can use a seedling mat under them. Encourages root growth. Cheap to run. Cheaper than trying to heat the room or tent.

I’m just going by the pictures you posted. Those appear fried and not deficient. But I could be wrong.

I pinch them off to change the plant chemistry from flowering to vegetative growth. To each their own. Probably more than 2 ways to do it.

Possibly a deficiency but one caused by an excess of something. Or multiple somethings.

Liquid or dry they’ve been overfed.

With everything you’ve given I seriously doubt any deficiency. In fact I suspect just the opposite.

Pinch any flowers off.