Yes you right Millet.
Just for completeness - one thing - survival and another - healthy life. Now, when I had citrumelo in greenhouse during winter, I see the diference between growth in spring, when it was outdoor during winter and now. One also has to remember, that if he wants crop, so it has to be very fast ripening variety, which will be ripe before first frost.

Touching on Millet's post. Our winter here in the southeast started about a month ahead of time. We had a very cold spell in the beginning of December & really didn't let up until mid Feb. Normally we don't get our first frost until the end of Dec.

Millet, well said. One of our citrus Gurus (whom I have encouraged to join the forum) had some interesting experiences this past winter when it comes to death/damage/ survival of citrus trees through "winter events"

1) a small Harvey lemon budded onto trifoliate, in the ground , in a cold frame covered with frost cloth and a few Christmas lights died completely. this tree was pushing out growth when the November arctic freeze brought temperatures to -8 - -9C. tree was in active growth at the time. DEAD

2) 2 Kaffir limes same conditions same cold frame as the Harvey, 1 inactive growth died back to the graft (this one was in a growth flush) the 2nd Kaffir lime which was already dormant survived without a blemish and it was 1 metre away from the one that was killed by the freeze.

http://www.youtube.com/watch?v=hghUpDmGq9s

http://www.youtube.com/watch?v=sEx6I4c7ys0

Greg

I have found yuzu to be less cold hardy than satsuma. Last winter with 4 days straight of frozen weather, not a satsuma tree dropped a leaf. The yuzu dropped all the leaves.

I think that the way how citrus Junos manifests itself in Nikita botanic garden, its defoliation has the same character as of citrus trifoliata, but this mechanism does not switches on every year in the autumn, but depending from the strength and duration of frosts. That is in this case defoliation is a sign of a switch into a deeper state of peace than for example in Satsuma. Respectively it is a sign of bigger frost resistance. Six trees of citrus Junos are growing in Nikita, they were planted more than 60 years ago. And during this period there were frost to - 15C several times. During night of 24.01..2006 there was a frost to - 12,4C, but according to Nikita employees, Junos was without damages.

In Nikita Yuzu trees are about 8 meters height:

These are very impressive Yuzu trees. Being of such a large size, there is likely a correlation between size and freeze tolerance.

Forward thanks for the photos!

Greg

Very impressive. Do these trees produce fruit ?

Yes, these trees gives fruits with normally matured seeds.

Looks like a very nice place.

In Nikita on the 1st of February the temperature was till -11,9C at night and during day time it raised up to -5,4C. There were a couple of days with similar temperature. I am going to be there in spring, I'll take photos of Junos and show them here.

Yes, but it is out almost in the center of the Black sea which must keep temps quite a bit warmer than the interior of the Ukraine. The palms are Trachycarpus (Windmill palms) which are the most cold hardy trunking palms.

I look forward to hear if it will survive this winter cause with day temps around -10 C. and night temps around -15 C. for a whole week ten it also would be suitable for Copenhagen Denmark. Lowest temps so far in this "sibirian" winter was this morning with - 8,2 C.

That would be about 17F, Yuzu have been known to survive down to 10F for short periods. 8 Meters is about 26 feet tall, so those trees must have been there for quite some time.

Yes, this group of six Junos trees has been growing in Nikita since 1952. For some reason there were no information about this during USSR times. I knew then olny about Trifoliata.