Temperature throughout flower

[EarLobe]

Afternoon all, quick one.

 

What's everyone doing with their groom temps as they progress through flower?

 

I've been sitting around 29-31 throughout veg and I've brought it down to 27.5 as I've come into flower.

 

Wondered what's best for the plants to be honest? Should I have kept the temps a bit higher, dropped lower or does it not matter so much? 

 

Atb

[DeltaMelter]

Start High end Low should do the trick.

 

27C is fine for flower maybe in the last 2 weeks you want to drop it to 25C to keep some terps but otherwise it's great for growth and photosynthesis (yield) so go for it. As it gets colder over Autumn it might naturally reduce a bit.

[EarLobe]

Thanks @DeltaMelter. Was along the lines I was thinking but wasn't sure how far it'd be safe to take it without affecting something.

[MindSoup]

I feel like this one is still very much a person preference thing/up for debate. I basi just keep my temps at 27-28C for the whole grow (unless the weather makes that difficult) but I increasingly hear people talk about dropping it down lower for the last few weeks. How low varies quite a lot, I saw one of Bruce Bugbees guys talking about 20-21C or something mad, not sure if I necessarily buy into that one myself. 

 

I can't speak from experience, I'm not scientific enough in my approach and I never run the same cut regularly so impossible for me to really say, but I don't see how dropping to 24-5C would cause any harm and it at least aligns with common sense that it would help preserve some terpenes/VOCs. 

[MidgeSmith]

4 hours ago, MindSoup said:

I saw one of Bruce Bugbees guys talking about 20-21C or something mad, not sure if I necessarily buy into that one myself.

My experience is only a dozen grows altogether, but I have to say, the cooler I have finished, the better tasting and smelling the results have been for me thus far.

Last crop I was doing 22 daytime and 18 at night max and I got lovely colours, taste and smells and rock hard buds on the plant which had the lowest DLI weirdly. The taste and smell was massively helped by use of the curing fridge though, so I am not claiming the results are valid.

[EarLobe]

I think I set 25 about the lowest I'd want to go because of the roots. I like to keep them at 25 near consistently so keeping the air temps there and above has just made sense.

 

I've been considering doing a grow coming into the autumn with temps a few degrees lower.

 

Got a diary up here at all @MidgeSmith?

[MidgeSmith]

I've never set the roots over 22C, though the tube temperatures take the soil temperature up to more like 25C.  I've never heard that it is necessary to keep soil temperatures that high, I think Ed Rosenthal said 22C is optimal, I just can't keep mine that low in the grow-room   I just make sure the water / feed is up to grow-room temperature before delivering it.

Yeah I think I have one on here somewhere.

Edited 3 hours ago by MidgeSmith

[EarLobe]

I've always monitored the root zone temps but it was only when I upped the temps down there that I noticed roots would just explode as soon as I had potted up. One year I think I watched roots pop out of 10L fabric pots from 5L plastics within 3 days. Ever since then I've just kept them high but I am tempted to have a play around to see what works best.

 

May be something particular to my environment but everything just seems super happy when all the temps are up. I think that's why I'm so apprehensive about lowering them now lol.

[MidgeSmith]

Yeah.  Personally I'd keep mine at 22C if I had the technology to do it simply, but it's never been a problem up to 26C in my tent, so I don't really mind either way.  As you suggest, if it ain't broke...

 

 

Edited 2 hours ago by MidgeSmith

[EarLobe]

I'm at 32 pretty much the whole way through veg but never pushed it passed that. Nothing went awry thankfully and my excuse was I needed to get the leaf temps up .

 

Winters around the corner with a whole new set of headaches yet!

[MidgeSmith]

Winter is better for me.  It's harder for me to lose heat than gain it the way I run.  32, fuuuuuck!  My leaf temps are only 1C-1.5C below Air temps.

Very interesting to hear though, thanks

I'm in soil.

Edited 2 hours ago by MidgeSmith