Plants temperature

[blendmik]

Howdy,


I had to move my operation to my basement for security reasons AND where it was averages around 80 degrees in the summer with minimal circulation so it was not gonna work up there.


My basement is perfect in the summer, but we get down to zero sometimes in the winter and the temp is usually around 50-60 because the boiler is running so it's never COLD down there.


What is most important in the temp range ? Is it more important to keep the pot and bottom warmer or the veg foliage part ? Plants will be off the cement floor under CFO and LED until I get my CAB built ?


Thanks for any input.

 

[djibra]

It's important that the pots don't get too cold because roots don't like it and will stunt growth...in my garden it's around 23℃ at winter and 32℃ max in the summer...and the plants don't seem to dislike it..but cold root temps can pretty fuck things up

 

[asaf]

The relation between roots temperature and foliage is the key, this difference affects pressure into the plant, consequently the movement of water nutrients etc.

Get as reference the relation with optimal conditions and try to maintain it in your garden environment.

 

[vikinglace]

Keep the roots warm and the rest will follow. Your temps sound fine once you have a light running etc. Tube heater or heat mat under pots will sort you out.

 

[stoned-trout]

I had similar conditions and used seedling heat mats ..I used 4 ft ones about 99$ each....yeehaw..crops and plants were fine and had awesome colors...you could do soil heating cables and sand or other options too...

 

[Tynehead Tom]

what's important too is to keep those evening and night time temps in the magic 10 degree F difference. I run 80 to 84 F over the course of lights on so take measures to keep night time temps around 72F and never lower than 70F.
plants are luvin it.
for vegging I try to keep temps night and day the same right around 78F to 80F if I'm trying to build roots.


another good trick for basement floors is to grow on sheets of 2" thick sheets of Blue or pink insulation board or on pallets. cold basement floors is bad, leads to root zone issues , especially if those roots are much colder than the room.

 

[corky1968]

The closer you can keep it at 25°C when the lights are on. With a
drop in to around 20°C when the lights are off. The plants will be
happier.

BTW: I never liked going into the mid 80's or higher.

 

[Tynehead Tom]

ya corky, I hear ya. I wasn't suggesting above 80 as a recommendation, with C02 absolutely.
what I meant was that my tent , with the cooling set up I have, my tent peaks at 84F. Not by design , just because I'm relying on cool outside air to balance my lung room, no air conditioning.
so because I hit 84F at peak (but generally 82) , I keep the room heated enuff during lights out with a baseboard, to keep the 10F day/ night differential, so right around 72F

 

[corky1968]

I was just stating my preference that's all.

I once had the temp go to 32°C when I 1st started growing and didn't like what I saw.

Poor plants.

 

[Snook]

Let me ask about this 10*F lower at night stuff. I like to relate to nature for some 'guidance'.


EXAMPLE: In nature, daytime temps can easily reach 80*F to well over 90*F and night time temps can easily be in the 50s or 60s. That is +|- 30*F.

Are we meaning to say that temps should be 'at least' 10*F lower at night time but not lower than ??? 65*F. Many reviews of the blue strains talk about very cold night time temps to bring out the colors and I do realize that those temps are at the end of bloom. Does this 10*F affect harvest timing, growth or yield?

 

[corky1968]

Let me ask about this 10*F lower at night stuff. I like to relate to nature for some 'guidance'.


EXAMPLE: In nature, daytime temps can easily reach 80*F to well over 90*F and night time temps can easily be in the 50s or 60s. That is +|- 30*F.

Are we meaning to say that temps should be 'at least' 10*F lower at night time but not lower than ??? 65*F. Many reviews of the blue strains talk about very cold night time temps to bring out the colors and I do realize that those temps are at the end of bloom. Does this 10*F affect harvest timing, growth or yield?

a) Nighttime temps should go lower. Anything lower than 15 degrees from daytime will slow the plants growth.

b) Colder temps will increase the color in some strains when they ripen.

Here's a RSC Lebanese that I grew in 2009 and it got cold before I harvested her. Both pics were taken on
Sept. 13, 2009. Using a website that archive temps for years. The temperature that day was was 16.7°C
at 12 Noon. Up from 13.4°C at 05:00 AM that same day.

 

[asaf]

This can be of help, these measurements are from one complete grow cycle in a greenhouse.

The strains sensistar and nebula, from head temp +-, humidity +- and in the end height reference, irrigation and in red transplant.

This is one nebula, the reference for measurements.

 

[stoned-trout]

I don't buy the night day diff slowing growth. here in so cal I get higher and have no issues..yeehaw..back east I would go into mid 80s then high 50s and yields were great so weren't colors...long as roots warm all is well...

 

[blendmik]

temps

temps

I don't buy the night day diff slowing growth. here in so cal I get higher and have no issues..yeehaw..back east I would go into mid 80s then high 50s and yields were great so weren't colors...long as roots warm all is well...

yes, my thoughts also as I have sampled some awesome from N Cal and it gets cold up there

 

[blendmik]

Excellent

Excellent

This can be of help, these measurements are from one complete grow cycle in a greenhouse.

The strains sensistar and nebula, from head temp +-, humidity +- and in the end height reference, irrigation and in red transplant.

View Image

This is one nebula, the reference for measurements.

<a href="https://www.icmag.com/ic/picture.php?albumid=66591&pictureid=1584144" target="_blank">View Image

this is excellent, thanks

 

[blendmik]

sounds like the "perfect" venue

 

[blendmik]

excellent

excellent

The closer you can keep it at 25°C when the lights are on. With a
drop in to around 20°C when the lights are off. The plants will be
happier.

BTW: I never liked going into the mid 80's or higher.

yup, perfect

 

[blendmik]

for sure

for sure

It's important that the pots don't get too cold because roots don't like it and will stunt growth...in my garden it's around 23℃ at winter and 32℃ max in the summer...and the plants don't seem to dislike it..but cold root temps can pretty fuck things up

I am getting that idea. It never gets below 50 even when outdoors is sub zero.

 

[blendmik]

bottom up

bottom up

The relation between roots temperature and foliage is the key, this difference affects pressure into the plant, consequently the movement of water nutrients etc.

Get as reference the relation with optimal conditions and try to maintain it in your garden environment.

Yes I agree warmer on the bottom. Right now I have my thermo indicator capsule lowered to the bottom of the pots and it reads about 67-70

 

[blendmik]

temps

temps

Keep the roots warm and the rest will follow. Your temps sound fine once you have a light running etc. Tube heater or heat mat under pots will sort you out.

yes, heat mat is going to be the way as it gets colder.