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Old 09-19-2020, 09:40 PM #1
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How susceptible to frost is cannabis?

Is cannabis one of the first crops to suffer, or the last, or... in between? Does it ever get wiped right out, at the freezing point air temperatures?
Thanks for any wisdom.
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Old 09-19-2020, 11:45 PM #2
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Oh ... Lake Erie. Well, I think St. Phatty posted about one of his that got covered by snow and survived.
I 've seen them turn purple from frost.
And ya gotta think: They grow very well in the Himalayas (eg: Hindu Kush.)
Lack of sunlight probably hinders their growth more.
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Old 09-19-2020, 11:54 PM #3
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My buddy was growing in the Catskill mountains in the mid 70's...

His plants got an inch or two of snow on 'em a couple of years and he told me he was worried, but then he said it made the plants even better...

if you're talking frosts around 20 F., you better cover them or get them in...

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Old 09-20-2020, 12:15 AM #4
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Originally Posted by Teddybrae View Post
Oh ... Lake Erie. Well, I think St. Phatty posted about one of his that got covered by snow and survived.
I 've seen them turn purple from frost.
And ya gotta think: They grow very well in the Himalayas (eg: Hindu Kush.)
Lack of sunlight probably hinders their growth more.
Good points, thank you.
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Old 09-20-2020, 12:17 AM #5
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Originally Posted by Bud Green View Post
My buddy was growing in the Catskill mountains in the mid 70's...

His plants got an inch or two of snow on 'em a couple of years and he told me he was worried, but then he said it made the plants even better...

if you're talking frosts around 20 F., you better cover them or get them in...

..
Actually, the forecast is 32° for an hour or so at 05:00.
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Old 09-20-2020, 01:59 AM #6
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We've had seeds over winter and sprout in Spring in sidewalk cracks. Light frost doesn't hurt plants. Even snow doesn't in moderation. Depends on strain, I'm sure.
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Old 09-20-2020, 02:57 AM #7
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I follow this guy on IG that travels around india, he has shown many pictures of the years of Indian landraces with icicles literally hanging off the leaves and buds and the plants are still alive.

Our modern hybrids have been so acclimated to the perfect indoor environment frost will kill most of them outdoors.
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Old 09-20-2020, 03:02 AM #8
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We had a hard frost Last night I discovered frosted flowers...They defrosted and looked OK more purple even...It’s going to happen again tonight for one hour at dawn it’s going to dip below freezing
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Old 09-20-2020, 12:31 PM #9
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Most can handle frost the problem to watch for is the bud rot this time of year. If they don't get good sun still they never dry out good during the day and the rot will set in.
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Old 09-20-2020, 12:48 PM #10
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Many plants can handle a certain amount of frost. Snow cover often actually insulates plants against lower temeratures.


What can damage frosted plants quite badly is if they get thawed out quickly in the morning sun - this is what ruptures the cells and destroys them more than the frost itself - so gardeners will usually site susceptable plants and things like greenhouses so that they don't get blasted by early morning sun and are shaded at that time so that the frozen plants thaw out more slowly with less damage.
The purple colour seen at these times is from the plants making anthocyanin - their natural anti-freeze .


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