Too Cold ?

Hello,
So, I had to move my plants because I am a renter and inspection etc. So I moved them into the cold, and messed with the light cycle ETC.. it was probably in 20's Fahrenheit for about an hour.
I moved them back into the room, added a heater (set on minimum heat) I accidentally left two vents open which let the freezing air in overnight, I'm pretty sure they suffered from cold and now quite a bit of the leaves are yellow/purple/black ETC, it's been 3 days and it seems like some of it is coming back to life.
My question;
Can they recover?
Also, they are 2 weeks flower.

I'll get pics soon. It's pretty fucked though.

how cold did it gert

Man Good Luck to you! 20 degrees is incredible cold. At that temperature the cells in the plants rupture and growth dies back or grows slowly. If you were in veg you would have time to recover. Cold in addition to the photoperiod fluctuation is very hard on your girls. Only time will tell how they fare but I can garuntee you that your harvest is affected either in weight or time or both.

fem seeds?

Look on the bright side, at least what you do end up with at harvest will be purple.

Let's hope only time.

normal seeds, started about 30, ended up with 15 females.

some are still purple but a lot are turning yellow, they seem to be slowly recovering.
I'm going to be feeding tomorrow with a mix of grow and bloom nutes.. Not as much as I normally do, also I was thinking what might help is some co2. I've closed the vents so I'm not getting much fresh air, if I added co2 I should increase growth and recovery.

In fact I'll do some research on that right now and get to making a diy co2 generator.

Nolan said:

Let's hope only time.

normal seeds, started about 30, ended up with 15 females.

some are still purple but a lot are turning yellow, they seem to be slowly recovering.
I'm going to be feeding tomorrow with a mix of grow and bloom nutes.. Not as much as I normally do, also I was thinking what might help is some co2. I've closed the vents so I'm not getting much fresh air, if I added co2 I should increase growth and recovery.

In fact I'll do some research on that right now and get to making a diy co2 generator.

Click to expand...

CO2 is only effective at high concentrations 1200-1500 ppm. Normal air contains 300 ppm. To keep the CO2 elevated at this level it's gonna take a bit more than some yeast and sugar. To be properly implemented and not just a waste of time you should be looking at some CO2 canisters or propane tank for a CO2 generator.

GrowingfortheGold said:

CO2 is only effective at high concentrations 1200-1500 ppm. Normal air contains 300 ppm. To keep the CO2 elevated at this level it's gonna take a bit more than some yeast and sugar. To be properly implemented and not just a waste of time you should be looking at some CO2 canisters or propane tank for a CO2 generator.

Click to expand...

alright, thank you for the advice. I'll look into it.