Last year was a higer then normal temperature where I live. My plants bearly grew. This year is forecast to be the same.
I went through the topics but did not find anything specific regarding preventing plants from harm in extreme heat. Therefore, I am starting this topic. I have done some internet reading on the topic and got some ideas. I am seeking OGer’s input since I trust the input of OGers. I have been using it for a few years to improve my output in my garden.
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How hot are we talking?
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I’d be looking at some sort of Shade Cloth, to start. It’s a cheap way to filter out some of the harsh direct sunlight, and help cool the plant.
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Thats super discrete for outdoors. I love that jeez
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What is the percentage of the shadow? I use 30% , yours seems to be much more … the girls here keep burning in hell 
Short green tent is great for clones. holds 12 x 5 gal growbags, packed full. I had some led lights crammed in there last summer. and a clip on fan. Probably not tall enough to flower.
Clear tent is perfect size for the outdoor solar powered hydro-tote. Solar usb battery for the usb led lights. Air pump. Fans. all solar powered. This thing was fine last summer under my steps. kept the clones out of flower.
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So are you just vegging evrything outdoors for the free electric?
Do you bring indoor to flower? Have a quarentine room, or what?
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Last summer I vegged outside, and brought them in to flower. it was back to back flowering in the grow room. which is an old furnace room in the basement. It’s constant routine cleaning. between grows is a few days of ozone.
Ya. also taking clones, and keeping them in veg. when my lights inside are 12 hours. no tents in there.
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I’m currently finishing off a plant in 18/6 because I have no choice.
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I live in a very hot, semi-arid desert region in the US. There are a few things that I’ve learned about growing outdoors in this environment.
Plant in the ground if possible. These plants can take a lot of extreme conditions – as long as the roots are protected! In a black plastic pot, your plants will be very stressed because the roots are stressed. Protect the roots. Use lots of mulch.
Another great way to protect the roots is to sink your beds. Raised beds are almost as bad as black plastic pots in the sense that the roots will be warmer than if they were in a bed that is sunk below grade. Cool air will pool there. It will also act as a rain collector for water.
Have some kind of shade from 2-3 o’clock on. Afternoon heat is the most intense.
Use Silica supplement. It’s next to impossible to over-use, but you know, follow the recommended dose. It has many benefits to your plants handling heat.
And lastly, don’t grow in the Summer. It’s possible to pull three harvests a year here, without growing in the Summer. June is always the most extreme - lots of heat with no rain in sight. July and august will bring monsoons, which is a good time to bring plants that you’ve started indoor, out. Harvesting in November, December, or later, is awesome because those cooler temps do wonders for your flowers 
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- dominant winds of the spot (usually west to east but a bunch of spot have their micro climate)
In protecting the plants from the dominants wind you don’t only have cleaner buds, but you’re reducing transpiration rate a lot (with canna and hemp).
- the curse of the sun over the crop (and in summer/autumn only ^^)
It’s silly but a right orientation can help, compromise too (only the direct sun of a specific hour of the day, by example).
- preparing the soil to restrain evaporation.
Seriously, just go watch pro grow op in Oregon. You have a bunch of videos on youtube. It’s not often shared (by proudness i guess) but it’s just the hell for outdoor at many levels over there. In my heart the Oregon farmers have always an arbitrary bonus for this.
- a screen, preferably white.
Just like the ones you use to protect the fragile fruit trees for the winter. Results aren’t as much lowered than one can expect. Canna is able to grow and flower decently outdoor in the “shadow”.
- If you’re merican, a portative AC set nigh and day at 62F with a fuel generator aside (for co²). If you’re french, you plant these seeds to be stolen at autumn so the hidden greenhouses stay untouched ^^ if you’re spanish, you just cross sativas of the most arid zones and don’t even call it a haze because you don’t give a damn fuck. if you’re a dutch, you’re mono-cropping an unique cut that survived to everything indoor. And you show the guerrilla grow op as breeding facility ^^ The SD give really some inspiration lol
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Ive grown a bunch in extreme heat outdoors. I had one season I was off grid, and the days were between 115-125 every day, and below freezing every night.
Shade cloth is a great plan, I used to run 50% over my veg greenies. But once it’s flowering most stuff likes tons of sun. But IME the real important factor is the right genetics. Stuff like haze, kush, cookies, green crack, and a few other varieties are notoriously tough in wild ass heat.
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If you grow in the ground not containers, heavy flagstone/bluestone above the root zone helps keep the roots cool and retain water. Best advice in this thread is shadecloth tho!
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Last year where I live the temps were in the high 20s C to low 30s C. Those are usually July temps. This year we are already in the high 20s to low 30s C. The forcast is for another hot one.
Last year I had probably 40 percent more males then I have ever had. I have read that heat can do that.
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A neighbor had a huge roll of window screen. Do you suppose that will work and not block out too much light?
Where do you purchase that shade cloth?
So far there are very good suggestions. The problem I would have is my garden is about 15-20 feet by 10 feet with 20 gal pots. i need a lost of material.
I use above ground fabric potss. If I made a small indentation in the ground in to which to insert the pots, do you suppose that might do some good?
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