Citrus > Cold Hardy Citrus

Report on winter 2017/18

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Zitrusgaertner:
Location Vienna/Austria Zone 7b
After a very mild period of tempertures mostly above 0°C we had one week with minimum down to -15° and daytime temperatures below zero. During this week I protected my Citrumelo 5*, Ichangquat and PTXSunki with thick fleece. C. ichangensis IVIA got only some sunprotection and Chimera "Prague" stayed unprotected. Prague does not show any damage. It is now full of flowers. Citrus ichangensis lost 50% of its leaves but  nu further damage. Citrumelo 5* which is high crafted, has heavy cracks on the bark of the rootstock (PT!) and has lost all its leaves. It will lose wood aswell. Ichangquat is nearly dead, but PTXSunki has no damages. It lost all its leaves as it does nearly every year. I was a little bit frustrated because I thought high crafting would prevent frost-cracks on the bark but t oviously does not. Any ideas why not?

Citradia:
I lost all my hardy citrus that was unprotected except one Dunstan citrumelo and a citradia. We had one week in January that didn't get above freezing. I lost five Dunstan citrumelo, a citradia, Ichang lemons, nansho dai dai, Thomasville citrangquat, and a Morton citrange, and a Rusk citrange. My lowest temp this year was 10 degrees. The trunk on my 10 ft tall Dunstan exploded all around 360 degrees. Dunstans that barely lost leaves that few years unprotected died this winter. They can't handle a week below freezing.

manfromyard:
Despite this past winter not getting as cold as previous ones, I have quite a few deaths. I can only think that the warm winter weather (70s in January), stopped the trees from entering dormancy. When the Nor easterners rolled through, they all got hit. 3 Bloomsweets look dead. Yuzuquat looks dead. 6 year old Citrangequat is green at the base, but the branches were green at first, then died.

It looks like the warmer winters are even more dangerous than the cold ones... >:(

Ilya11:
Very unusual combination of weather conditions this winter. Two verymild periods interrupted by episode of heavy snow with -5C nights and another  week with -9C nights without daytime defrost (20 cm frozen ground)  with strong winds of 85 km/h.

Unprotected plants:
Thomasville- strong damage, most of leaves gone, small twigs are dead.
Citremon Voss- upper  late summer growth is dead, but plant is OK and pushing new growth
Morton- some leaf loss, but will flower soon
5* citrumelo- lost some  leaves on North Eastern side but heavily flowering now
Three meter high Yuzu ( low graft on poncirus)- no damage( it got severe stem cracks last winter)
Ichang Lemon Shangyuan- heavy bark cracks, most probably will die
Ichanquat- no damage
899J-  loss of upper branches, but is pushing a new growth
FDxHamlin (from Roberto) no damage
PTxSunki ( same source) no damage
High  grafted Prague- lost all its leaves, but strongly growing now
ichangensisxsinensis (Tintori via Mikkel)- last summer high stem poncirus graft, lost all leaves, but no twig damage, is growing now
Very big surprise- same age small graft of Slava Michurina (Orange/PT chimera?) undamaged old leaves, actively growing now. I got mother plant from Z.Cernoch in 2010, very  slow development in a pot
Hanayuzu- stem cracks, probably will die
Early St.Ann satsuma seedling -initially no damage, but probably will die because of stem cracks
Taichang seedling ( 2 meters high, no damage in past 6 years) all  small twigs are dead, no growth, probably most of the trunk will be lost
C.ichangensis SRA241- some twig damage, no growth yet
N2tri("Neuezuchtung" PTxichangensis hybrid of B.Voss)  no damage

One layer fleece cover on a surrounded cage frame:
Yubileiny (AsahikanxGrapefruitPernambuko)- dead
Taiwanika- no damage
Bloomsweet ( low stem poncirus graft, budwood from Sylvain- different from Voss plant)- no damage, but not yet growing
Another surprise- "Pseudo Yuko" from Z.Cernoch- plastic cone with open top protection, some twig loss, but one leaf is still green. This plant was desperately dwarf in a pot, I planted it in ground last spring, in November it gave three small yellow fruits  that look and tasted like real lemons.
 
Among my hybrids- lost many seedlings that were perfectly robust during past winters, but still have some  that are not damaged at all.

Ilya11:
And I forgot to mention the biggest surprise: unprotected Keraji (low poncirus graft, budwood from Tintori plant)-  no damage at all :o

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