As I understand it, exactly this. On a small scale this is the same principle as sheltering a tender plant by planting it underneath an evergreen canopy or, on a bigger scale, cloud cover rolling in on a cold night preventing what would otherwise be a nasty frost. If there is a heat source (other than the ground) so much the better but the principle remains the same - to capture heat that would otherwise radiate away into the atmosphere. In the open garden a cover like this can also mitigate the physical effects of frost/snow coming into contact with the plant but that is a different situation.TomInTucson wrote: ↑Wed Jan 10, 2024 10:56 pm The theory behind its efficacy is; since the ground is almost always warmer than the air on cold nights, the warmer temperature can be trapped underneath the cloth. The reason behind the use of stakes is to keep the vegetation away from the cold air.
It's going to get cold.
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- Paul in Essex
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Re: It's going to get cold.
- habanerocat
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Re: It's going to get cold.
If the heat comes from the ground then bubble-wrap on benches and this type of carry-on can't be of much use surely?
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- Paul in Essex
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Re: It's going to get cold.
There's no 'if' - heat is lost by the ground. Any type of barrier can mitigate this to one extent or another - bubblewrap, newspaper, foil blankets. Even a layer of small children, although I see those more as a heat source.
And 'this type of carry on' is something else entirely - protecting the growth point from the direct action of frost or snow making contact.
And 'this type of carry on' is something else entirely - protecting the growth point from the direct action of frost or snow making contact.
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Re: It's going to get cold.
Yellowknife in North Western Territories Canada is -41c today warming up to -37c.
- ralphrmartin
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Re: It's going to get cold.
Its cold at night here, but warms up nicely by the time the sun goes down. The temperature in the unheated bit of the greenhouse was down to 1C last night and up to 15C at the warmest today.
Ralph Martin
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https://www.rrm.me.uk/Cacti/cacti.html
Members visiting the Llyn Peninsula are welcome to visit my collection.
Swaps and sales at https://www.rrm.me.uk/Cacti/forsale.php
My Field Number Database is at https://www.fieldnos.bcss.org.uk
- Tina
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Re: It's going to get cold.
unheated bit of the greenhouse was down to 1C last night and up to 15C at the warmest today.
That's a really good variation for the plants
Tina
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varied collection of succulents and cacti but I especially like Euphorbia's, Ariocarpus and variegated agaves.
Bucks, UK
Branch co-ordinator, Northants & MK BCSS https://northants.bcss.org.uk
BCSS Talk team member, contact me- BCSS.Talk@Gmail.com if you want to volunteer or suggest a speaker plz.
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Re: It's going to get cold.
That's a bit like the temperature outside here in Portugal at the moment, although the lowest so far this winter has been 2.5 and it often gets up closer to 20c.ralphrmartin wrote: ↑Thu Jan 11, 2024 4:46 pm Its cold at night here, but warms up nicely by the time the sun goes down. The temperature in the unheated bit of the greenhouse was down to 1C last night and up to 15C at the warmest today.
Patrick. Small varied collection of North American, Mexican and Andean Cacti. Variegated Agaves and Echeveria. Developing a succulent garden in Portugal. Joined Somerset BCSS and forum in 2007.
- Aiko
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Re: It's going to get cold.
Up here it is a bit colder. Two nights ago it was around -7C, and last night my plants that I kept in my unheated greenhouse (about half of the cacti) had to endure -9C. Coming week it will be around 0C.
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Re: It's going to get cold.
Much of the UK is predicted to have another period of cold weather (potentially with some snow) next week -7 to -10oC to look forward to in some places.
So following on from habanerocat's question, if you had a plant in a greenhouse, is it safer from cold on the staging or partially sunk into the ground?
Assuming the ground remains dry of course and the greenhouse is unheated and everything else is equal between the two locations.
I've tried both approaches in the past and for me staging wins- but I think this might have been just because of the increased risk of plants gettting wet if sunk into the ground.
So following on from habanerocat's question, if you had a plant in a greenhouse, is it safer from cold on the staging or partially sunk into the ground?
Assuming the ground remains dry of course and the greenhouse is unheated and everything else is equal between the two locations.
I've tried both approaches in the past and for me staging wins- but I think this might have been just because of the increased risk of plants gettting wet if sunk into the ground.