Phosphorus deficiency?

Black Sugar. A robust plant that took off from the beginning but is now demonstrating what appears to be phosphorus deficiency. Temperatures in my basement have gotten cold - 40-50’s F in the tent at night. Can’t change that. Experienced growers...Is this a phosphorus deficiency and how do I get rid of it?

Ehh, not really. You may want to invest in a small oil heater to keep temps up, but what you're seeing is the plant doing some end of life metabolic changes. Like the leaves in autumn. Between the late stage of life and the cold, it's getting ready to die. Or maybe more accurately, doing everything it can to make the important part of the plant(seeds and buds), live, by sucking the life out of the leaves.

In a good way, I see no reason to worry. Get temps up if you possibly can.

You're not going to change it as long as you have those low temps.

You might want to check for bugs.

this is definitely from cold, I had to buy a heater no choice it runs in my off hours and I went from 51 at night to 68 for a 20$ amazon heater, I believe this cold snap caused my gg4 to throw nanners however that has also been debated as a trait...either way get those night temps up

Very low temps indoors can cause deficiencies that are temperature/uptake related. So while yes u see a P deficiency, xtsho is right it wont change with those temps.

You have electricity down there (lights)....so plug in a heater and fix the issue that way.

Yeah just buy a tent heater for like 20 euro and it will be fine

Thank you for your input. My thing is how do you outdoor plants tolerate low temperatures? I live in the southeast US-we have mild winters here. I guarantee you there are outdoor growers who are dealing with this during the cold snap. What do they do? Do they drag heaters outside? Turn up the sun?

I’m not an absolute newbie but I would not consider myself a seasoned grower either- I’m learning. But it seems to me the further we remove ourselves from how this plant grows in its natural environment the more problems we have. Rather than manipulating the environment what about adding phosphorus directly? A foiler spray? I’ve read about dried banana peels?

Trying to provide optimal conditions is outrageously challenging (at least in my case). It is particularly frustrating AND puzzling when one realizes that mother nature does not provide optimal conditions at all!! That’s why we’re having this discussion in the first place. It’s cold. But its supposed to be cold. It’s November! Flowering time! Which is exactly where my plant is right now. Are the conditions optimal in Asia and Africa right now? Probably not. One thing that is for sure, mother nature is not nearly as delicate with these plants as we are. Again, thank you for your input.

Even weeds need proper conditions to flourish. Will they grow in less than ideal conditions? Sure! Will they thrive? Not likely.

Also, the ground retains heat better than a pot on the floor so Mother Nature actually does provide better conditions. This is exactly why so many spend a lot of money to get our grow environment right.