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Temperate Fruit Discussion / Re: Zone Pushing - What to grow in unheated greenhouse in 8a
« on: July 20, 2024, 03:54:05 PM »
In my experience an unheated greenhouse helps a lot. But the way it helps is not easily translated in a few extra degrees. For example,I have two big trees of a type of Strawberry Guava (Psidium Longipetiolatum) here in Rotterdam. I had one inside my unheated greenhouse, and one outside the last winter with a full week of night temperatures of -6, -7 C in December. The minimum temperature at night was almost the same inside the greenhouse as outside. Maybe it was 1 or two degrees warmer inside the greenhouse. But that little extra protection against wind, against radiation and the fact that the air heats up in the daytime as soon as the sun comes out made all the difference. One tree is completely undamaged (the one inside the unheated greenhouse) and the other tree is completely defoliated and died back to the main trunk. It will take 3 to 4 years to grow that one back. So the protection inside the unheated greenhouse in the winter makes a lot of difference, but is difficult to translate in degrees.
Over the last ten years I have tried to grow a lot of subtropical fruits from the Myrtle family like strawberry guava, Uvaia, Ubajay, Pitanga, Cerella, and also citrus and avocado in my small unheated greenhouse and I even made some selections from the most successful experiments that I think are hardy enough to grow in an unheated greenhouse in zone 8 in Western Europe. You can check them out on www.bontegout.com/seeds-shop
Good luck!
Solko
Over the last ten years I have tried to grow a lot of subtropical fruits from the Myrtle family like strawberry guava, Uvaia, Ubajay, Pitanga, Cerella, and also citrus and avocado in my small unheated greenhouse and I even made some selections from the most successful experiments that I think are hardy enough to grow in an unheated greenhouse in zone 8 in Western Europe. You can check them out on www.bontegout.com/seeds-shop
Good luck!
Solko