Steve,
We usually get a couple of weeks of light night frost during the winter. I don’t grow citrus on a commercial basis, so I simply plant the types of citrus trees I can get locally. The vendors mostly don’t even know the cultivar names. Over the years, about a third of my citrus trees died because of frost. Mostly, we don’t get more than about -3 C, but I remember one year when the thermometer went down to -10 C for a few hours only, but that was enough to kill off many trees. The citrus trees that die usually grow back from the root. Once they are big enough, I use them for grafting with those that have proven to be frost-hardy in my place. It is best to protect young trees against the frost. Once they are bigger they are less vulnerable, even though, young leafs and branches will always die back during frost. In Japan, I have seen orange orchards covered with snow. It would be nice to have a list of frost hardy citrus trees.
Dieter
--- On Thu, 1/7/10, Steve Read <steveread@free.fr> wrote:
From: Steve Read <steveread@free.fr>
Subject: [permaculture] Citrus and cold
To: "permaculture" <permaculture@lists.ibiblio.org>
Date: Thursday, January 7, 2010, 8:17 AM
Does anyone live and cultivate citrus
crops in an area where winter temperatures drop to 0 and
where there is occassional air frost?
If so I'd love to hear any hints and tips that you might
have, apart from buffering with thermal mass! Is it better
to buy older trees for planting, any particular cultivars or
types of citrus recomended?
Many thanks
SteveR
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