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Signs of heat stress in cannabis plants: Photosynthesis slows past 85°F (30°C). Plants can withstand up to 120°F (49°C) if they have enough water. Cool plants with misters, fans, or foggers. Ways to beat the heat include moving plants to shade, using shade cloth, or wrapping pots with white plastic.

How can you help your Cannabis plants to thrive in heat waves?

Aug 14, 2023

Ed Rosenthal

Ed Rosenthal



*Signs of heat stress - The Photo above: By **Dutch Passion Seed Company*

Cannabis plants are hardy and survive outdoors in a wide range of
temperatures. As the temperature rises past 85°F (30°C), photosynthesis
slows until it stops between 90–95°F (32–35°C). At this point, plants go
into preservation mode; photosynthesis stops as the plants spend energy
acquiring water through the roots and transpiring it through the stomata to
keep cool.

For short periods, most cultivars withstand weather, up to 120°F (49°C), as
long as they have adequate supplies of water and a large enough root
system. The plants can be cooled using cooling misters or a misting fan.

You can also a fogger (which is a really useful tool) as a mister by
loading it with water. It's more effective as it evenly covers every plant
surface. This is a great and relatively cheap method. Here is a good model
with a steep discount

*If you run a commercial operation you might want to invest in a misting
system *

Here are some ways to beat the heat:


*• If containers are portable, move plants to a shaded area during the
hottest time of the day*

*• Place a 20–30% shade cloth over the plants to reduce stress*

*•Wrap the pots with white plastic to keep the roots cool. Do this at the
beginning of the season for healthy root growth.*

The Photo below: You know how much I love DIY solutions. Wrapping your pots
with white plastic is easy to do, cheap, and very effective. Photo by Christian
Petke

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