Citrus > Cold Hardy Citrus
Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
tedburn:
First cold spell (hopefully the only) this winter brought several frostdays down to - 8,6 °F / -12.9 ° C.
Interesting how microclimate differs by different places and passive protection.
Here the coldest place
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Only 3 m distance but in protection of a short wall brings 2 ° C of higher temperature
the 2 year old seedlings, see last post, with backwall greenhouse and front protection airbubblefleece shows
a gain of about 4° C
last (warmest) place and double protection with fleece and air bubble fleece shows a gain of nearly 7 ° C of cold reduction.
On second picture are the protected plants, one and two year old graftings of slava micurina, Duncan grapefruit and Bloomsweet graft.
Conclusion, for shorter periods passive protecton can be very helpfull against frost damage, also protected places in the garden.
bussone:
--- Quote from: tedburn on December 20, 2022, 05:49:21 AM ---First cold spell (hopefully the only) this winter brought several frostdays down to - 8,6 °F / -12.9 ° C.
--- End quote ---
Quick fix:
-12.9 °C is +8.6 °F.
-8.6 °F would be -22.6 °C.
Poncirus can survive that, but you probably need a windbreak for it. With some luck, they've been found on the 5b/6a border.
kumin:
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A few F² Citranges survived -11,8 F ( -24,5 C) in January 2019.
tedburn:
--- Quote from: bussone on December 20, 2022, 10:30:51 AM ---
--- Quote from: tedburn on December 20, 2022, 05:49:21 AM ---First cold spell (hopefully the only) this winter brought several frostdays down to - 8,6 °F / -12.9 ° C.
--- End quote ---
Quick fix:
-12.9 °C is +8.6 °F.
-8.6 °F would be -22.6 °C.
Poncirus can survive that, but you probably need a windbreak for it. With some luck, they've been found on the 5b/6a border.
Yes Bussone, your are fully right, temperature was +8,6 F, my head was perhaps already to early at the ° C
--- End quote ---
tedburn:
--- Quote from: kumin on December 20, 2022, 10:59:57 AM ---
[
A few F² Citranges survived -11,8 F ( -24,5 C) in January 2019.
--- End quote ---
Kumin, you did really a extraordinary breeding and selection, not sure if Poncirus is really much hardier. Only a pity, that frosthardiness and edibility are still in a big distance and will need a lot of further time and work. To my knowledge the only citrus with excellent fruit when ripe and really frosthardy citrus is Thomasville Citrangequat with hardiness about - 15 ° C but still one problem is that fruit ripens in spring and will be spoilt in winter freeze under -5 ° C.
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