Fellow citrusgrowers,

I was wondering what hardy citrus are available besides Poncirus trifoliata that can easily take on freezing winters?

greets

Citrus Ichangensis and some of it's hybrids are the next in line for hardiness. Most are not very good to eat, but they are hardy.

Short after-winter report from my place:

Looking hopelessly bad:
Citrus ichangensis
Ichang lemons
Morton citrange (still hoping for a bud around graft line)

I have/had a lot of Ichang lemon seedlings spread arround under various levels of protection. Is anyone survived is still early to say.

Troyer citrange (1.7m tall) have a dieback to about 70 cm above ground.

Rusk citranges defoliated, not much of dieback, most should survive.
Citrumelo seedlings looks the best among all mentioned varieties (although even those have a frost bite low on the trunk).

Note: Morton and Troyer citrange are grafted onto P. trifoliata rootstock,
others are seedlings of various age. None of them mature tree.

Minimal temp this winter was -20 C.

Main result - so far: Only P. trifoliata (Flying Dragon included) can survive local winters w/o problems.

-4F, I'm surprised any of them survived.

Here we had -15°C. Nearly everything died. Navel orange, satsumas, ponkan, morton, ichang lemon, C. Ichangensis etc.
Only survived PTs, FDs, Prague hybrids, 5 Stars, Yuzus and Ichanquats.

I have 4 Citrumelos and 1 Thomasville planted at various points in my yard. They all came through with flying colors after this admittedly mild winter. I did not protect them at all.

Now if they would only flower.

I live in zone 8a. I have Ichang Lemon, Dunstan Citrumelo, Thomasville Citrangequat and Rusk Citrange in ground. All unprotected with marginal to no damage each winter. The Ichang Lemon is now 5 years old and about 15 feet tall.

-28 -30 my region

Poncirus had some frosted twigs and it is ok now

Hello,

I live in southern France (Z8a). My yard experienced a decennial winter :
10 frost days, some nights down 10F (-12c), snow on earth & plants during this freezing phase. I gave absolutely no protection to my citrus.

Poncirus trifoliata intact
Citrus inchangensis intact
Citrangequat thomasville Some leaves burnt but pretty nice result
Citrus Junos (yuzu) total defoliation but is ok, shoots from every stems now
Citrus X US119 total defoliation but is ok, also buds from every stems now
Satsuma 'Hashimo' Almost dead, die back 40cm above the grown,
Australian sour orange (don't know if you've heard about it) dead

to continue..
Franck

In europe was an extrme winter like only all 20 years or even more rare.

Having Citrus trees for 20 years would not be so bad.

Yuzu is a great candidate for that and has lovely fruits.