Temperature

[jabez]

How cold is to cold in your grow room when the lights are off?

[Uncle Arthur]

G'Day jabez

 

Low temperatures at night are OK down to about 16 degrees outdoors, then start to effect the growth in a big way. Around 13 degrees will cause mild shock and below 10 degrees will kill your plants with repeated exposure. Keep your plants warm, especially the roots. Elevate pots if you think the ground is sucking the heat out of the roots. This is an issue if you have a slab or other type of cold floor.

 

Hope this helps

 

Uncle Arthur

[WantDaChronic]

my grow room temps can range from 10-50 degrees when the lights are off, it all depends on what season it is...

[everest]

yea there is a big window for temps , tbh i think the plants like a bit of cold at the right time then they look for the warm .... funny bastards

 

ev

[bufo marinus]

Yes the root temp is the important one. If it can be maintained around the 20' Celcius mark that is the temp to aim for. Too cold and growth starts to slow, too high and root disease/problems start. Concrete floors are a good friend in summer depending on where you are and the addition of an aquarium heater to the res is a good way to maintain the temp in winter

[MongyMan]

Yes the root temp is the important one. If it can be maintained around the 20' Celcius mark that is the temp to aim for.

 

I agree bufo, In my exp. they can handle the hottest summers so long as the roots stay cool and the coldest winters so long as the roots stay warm and the plants don't get frost on them (one heavy frost will kill most MJ plants)

[mull]

Hey jab, I'm down your end mate. I keep the intakes off or low on real cool to frosty mornings and cold days. The heater comes out in the next couple of months and thermostat set to around 15-17C.

 

Good luck with it.