Does prolonged exposure to cold diminish THC levels?

Were having temperatures of minus 20 and lower, the plants have been exposed to these temperatures without a heat lamp of fan for almost four weeks,
They are still alive but some of the older leaves are yellowing,
My question is, will this prolonged exposure to cold lessen the amount of THC in the plant or reduce the amount already produced?

how cold is the room they are in. i just ask because if they were in a room at -20, they would die after a night or two because the soil would freeze/frost.. older leaves yellow and die toward the end of flowering naturally also. i never read anything about thc degenerating in cold, but the plant will stop growing i think if it gets under 50 degrees F or something. sorry i can't help more.

Extreme cold (frost and close to frost) causes the trichomes to become brittle and prone to break off. Thats why hash is made with ice water.

Any temperatures below 60 degrees will cause the plant to go dorment and all growth will slow to a crawl, especially THC production.

ok thats fine, dormancy is good, im trying to acclimatise the species to the temperatures here so next season will grow better/more potent, i am still curious as to the effects of cold temperatures on THC levels in the plant,

rather than wether the plant develops more THC i was wondering if it retains the level of THC developed up until dormancy or if levels drop,

|Does anyone know?

cold=plant shut down.

Heat speeds up chemical activity
Simple example. AN ice cube will melt at 5c in minutes. Now at 50c it would take seconds.

mr.smileyface said:

Heat speeds up chemical activity
Simple example. AN ice cube will melt at 5c in minutes. Now at 50c it would take seconds.

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A "chemical change" means that the reacting compound(s) are changed into new compounds. The actual atoms involved remain, they are simply rearranged into the new compounds. The rearrangement is called a chemical reaction.

ice melting isnt a chemical change, it is a physical change

Cold temps slow biology

greensister said:

Any temperatures below 60 degrees will cause the plant to go dorment and all growth will slow to a crawl, especially THC production.

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True to a point. 60 is not really a "dormant" point.....It's still working, just slower. Below 50 is pretty well dormant!

Things to remember other then slower growth.....
Cold produce's "loose" budding!
Cold restricts P use more then others!
Cold affecting the roots is worse then cold plants, as the plants will rise in temps if in the sun quickly.
Warm days and cold nights bring on dew. Dew is wet buds and wet buds rot quickly if not in the sun early to dry out!
So as early as they can be exposed to the mourning sun - the better.

I've never had outdoor finished plants, be less in potency to same strains run indoors. It's the lighting - UVB availability in sunlight keeps it high....I run in MI and sometimes things finish in later Oct. It gets cold here!!! So cold and lower THC production is not an issue in my book....