The Tropical Fruit Forum

Thanks Jim, very interesting summary 

I only used cocos mat to some trunks or young grafting units to isolate.
I took this to not get condensating water to the plants.

Nice tree, could give some unteresting new frosthardy hybrids when blooming - only specification of the hybrids won ' t be possible. I also try to use my established outdoor citrus to test frosthardiness of different citrus varieties 

From 5 blooming citrus in ground keraji and HRS899a lost their fruitlets.
Sanford Curafora, Satsuma Collot and Yuzu x Citrumelo keep their fruits, at least one  .
As Yuzu x Citrumelo in the picture grows nice

Yes sure, if i get it to maturity I will report 

Yes I think this also is possible.
From my other Keraji, in ground but in greenhouse,
I harvested fruit already End of December and the
taste was already good. So in ground out of greenhouse the fruits I suppose will be a little bit later ripe, but before big freezes normally only End of Dec or January in our region, also in ground I expect good fruits, perhaps as you assume not fully sweet but already very useful.
So up to now for me Keraji is one of the best coldhardy citrus regarding cold hardiness and fruit taste !


 tedburn » 27 Déc 2021, 15:49

Aujourd ' hui grande recolte :lol: , l' un et seul fruit de mon première greffe, un citrus keraji.
Le goût de fruit je trouvais bon. Bon le fruit un peut petit
avec 4 cm de diametre, mais je crois que c' est normal pour keraji

Hi Kaz and Brian,
yes the rind is super thick, perhaps also because it was the smallest and latest fruit of this bunch and perhaps also cold overwintering by deepest 1°C is not very supporting for a good fruit. See my post up here from November, I had bigger fruit, thinner rind and more juicy.
Brian, hope your new plant will get good fruit.

thats a good question ? While it' s the first time flowers in ground I think I have to harvest in December, depending of first deeper freezes. May be it will not be the sweetest Keraji  .
If interested, I can report  . I have also flowering Satsuma Collot at the moment with first flowers, also in ground, so this will be an interesting comparison.
Regards Frank

Keraji after 3 years in ground with first flowers

Interesting table, though we all know, that the datas can only show a rough estimate due to complex influences of coldhardiness, as rootstock, ..... From my experience some very cold hardy citrus as Citrumelo x Yuzu, Chimera Prag, Bloomsweet Pomelo, 5* Citrumelo and Morton Citrange are still missing.
Morton ( on Poncirus) and Chimera Prag ( survived in my region -16 °C with fleece protection (Morton on FA 5 with 30% twig damage). The others -13 ° C also as a 1 year old graft of Clem yuz 2-2 on Poncirus.

I know this problem also, citrus are in good shape when remooving protection fleece end of february or march and then deeper nightfrosts and daysun and higher day temperatures then lead to bark cracks. Some of them heal, some lead to infected and dying twigs or
plant. This means to protect against daysun while nigt freezes below -3 or -4 ° C arises and to kerp the plant protected and dormant.

this year it took in pot -8 °C and looked very good begin march, but got stressed by following nightfrosts with daysun in april.
But still no fruits yet, a graft oft it has flowers but they are still closed, so hope to get fruits end of summer - I' m also curious 

I tested grafting already with a few month old seedlings and you have to take care due to the size, but it works well, only the scions also have been seedlings.
But with normal scions not so big you already could graft on one or two year old seedlings.