What temp is to high to grow outside?

un named

un named

Active Member
its just getting into summer here in aus and its going to be 32c i think its about 90f tomorrow its possible we are going to get a heat wave for a week or two later in the summer that will go in the 40s (104f) in the sun its way hotter then this but yer. so whats to hot for a 2 week old plant.
 
lol anything over 35 i would say is overkill, think bout it how they get muai wuai gotta grow it in hawaiwi hot place right? imo atleast
 
This is more about genetics than a hard and fast rule as to what is too hot. If you are growing most seeds from seedbanks which have been bred countless generations indoors under controlled conditions it could be too hot. If you are growing landrace sativas or indicas which have been bred in hot outdoor conditions then no worries. All of these plants have the genes to withstand the heat but many of these genes which have been bred indoors just don't have them active.
Suggestion is to keep the plants in diffused light, meaning some type of shade where the sun just doesn't cook your plant. I grow in the mountains at 6500 ft but have a friend which grows out many of my clones at sea level and at 32 to 36 degrees C which usually don't do so well the first couple of generations of clones. Then slowly they start to adapt to their conditions, keeping in mind that he doesn't allow direct sunlight on them but grows under more of a greenhouse type lighting.
Just watch your plant closely especially it being so young and easily to get burnt and dry crispy leaves, try hardening it off slowly so that it can adjust to it's conditions. Patience and careful observation will help get you through until she is bigger and hardier.
Best of Luck to you and your grow
 
sry dont mean to jackthread but i thought since its about outdoor temps i was wondering what is the lowest??
 
canefan said:
This is more about genetics than a hard and fast rule as to what is too hot. If you are growing most seeds from seedbanks which have been bred countless generations indoors under controlled conditions it could be too hot. If you are growing landrace sativas or indicas which have been bred in hot outdoor conditions then no worries. All of these plants have the genes to withstand the heat but many of these genes which have been bred indoors just don't have them active.
Suggestion is to keep the plants in diffused light, meaning some type of shade where the sun just doesn't cook your plant. I grow in the mountains at 6500 ft but have a friend which grows out many of my clones at sea level and at 32 to 36 degrees C which usually don't do so well the first couple of generations of clones. Then slowly they start to adapt to their conditions, keeping in mind that he doesn't allow direct sunlight on them but grows under more of a greenhouse type lighting.
Just watch your plant closely especially it being so young and easily to get burnt and dry crispy leaves, try hardening it off slowly so that it can adjust to it's conditions. Patience and careful observation will help get you through until she is bigger and hardier.
Best of Luck to you and your grow
Click to expand...

Good advice.
Canefan has the right approach. Shade it a little and keep an eye on it until it hardens.
Some varieties can handle heat as high as 140F or 60C (e.g.,Afghanistan). Granted, it will slow growth at extreme temps but they have acclimated themselves over the years. I have seen plants thriving in 130F+ temps. Even within a strain there will be individuals that can handle heat better than others.
I used to try to keep temps in the 70s but have found that I can go up to 86F (30C) with no problems. Figured out also that I needed to lower the EC when growing hotter. They seem to want more water and less nutes.
It was interesting to me to see the different types of plants they have in Afg. They have a huge range of temps over there and the locals have refined their crops to perform well in a wide variety of environments.
If you have consistently high temps you may want to consider an Afghani (especially the taller types) or something from Mandala. Just my opinion. Good Luck! :peace:
 
Tha Dope man187 said:
lol anything over 35 i would say is overkill, think bout it how they get muai wuai gotta grow it in hawaiwi hot place right? imo atleast
Click to expand...

I dont think its that hot in Hawaii bro about 28 av. But i agree, most indicas come from afghanistan and it does go over 35 there.
 
i have grown outdoors here in aus 4 or 5 times now and all i can say is they love it. indicas, sativas, hybrids u name it they love it. heat doesnt even seem to be an issue. i have grown out in the bush in semi shade and in my back yard in 100% sun. out doors the heat doesnt seem to be an issue. in fact if u plant now your only issue is going to be size and what the hell your going to do with all that weed when its done lol. i have just started growing indoors and its proving to be a real bitch, in aus our climate is perfect for outdoor growing u really cant go wrong. if u have the space and detection and theft arent big issues i would find a heavy yielding sativa and go with that, your only gonna get one big crop a yr this way so u might aswell grow the biggest plants you can, watch out for rabbits and roos kids and farmers and u should be ok in upper aus
 
plants can handle high temps 95-100f well i find they drink water like crazy though at these high temps indoors but grow very fast, you need to move a huge amount of air to bring new co2 in or use injection or they will suffer quickly , yellowing burning from the air etc
outdoors you wont have this problem

aslong as they are not getting burnt directly by lights or the sun in a hotspot they should be fine

when they are too hot they show you they fold themselves inward at the edges of the leaves , you can get the little infrared temp gun things now pretty cheap to measure the leaf temp directly of the plants which is more accurate , even with hot temps the leaves can stay cool , if the leaves feels cool they are fine, just be prepared to give them a huge amount of water, as in hot temps they drink like crazy to keep themselves cool :)
 
weed plants are very strong m8, you can push them to the limits, and they respond very well,
the op is lucky being in australia they have a huge amount of sun to make use of,
i think the op would do better if he were to pick strains that are from that region or tropical regions hazes grow excellent outside in aus
 
No worries mate!
Just keep her watered and she'll LOVE IT. With the proper soil/nutes you will see tremendous growth!
TMB-
 
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