Citrus > Cold Hardy Citrus

Which citrumelo is better? More resistant, better flavor or earlier to harvest.

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Curiousgardener23:
Hi Till, for the African Shadock x Poncirus, by "ripens partly in late autumn" do you mean that all of the fruit partially ripen or that some ripen and some do not? Also, how acidic is the fruit when ripe?

Till:
I meant part of the fruits ripen before winter part (the majority) in the next year. The plant has a very good growth power and fruits quickly get big. That is similar to pure pumelo (at least Chandler). So they are as big as a big orange now. But the time of ripeneness is then mostly later - also like pure pumelo.

The juice is pretty sour. I cannot measure it. But I think a Lemon is more sour.

I have now tasted the following Poncirus hybrids: Morton, Dunstan Citrumelo, Swingle 5 Star, Swingle 5 Star Mutation (faster growing, fruits a bit sweeter or ealier ripe), Batumi Citrumelo, C35, African Shadock x Poncirus, HRS899 Q/O, PT#7, and the mislabeled Citrumelo (Yuma Citrange?). My overall impression is that sweetness / low acids is not strictly recessive. All these hybrids are sour but less sour than Poncirus. Morton is even so sweet and low in acids that it is like a sourer sweet orange.

kumin:
I have minimal experience with 852 Citrandarin, considerable more with both Bishop and 1279. Bishop is expected to likely be an F² self pollinated seedling of 852, but there's no certainty of it. 1279 is an F¹ hybrid of likely, similar ancestry. 1279 fruits are smaller than Bishop, the 1279 flowers exhibit a pinkish blush,  which I haven't detected in Bishop flowers. The 2 trees are nearly indistinguishable, with Bishop foliage perhaps being a deeper green.
1279 hasn't proven to be quite as hardy as Bishop. This be be due to F¹ Poncirus hybrids being heterozygous for Poncirus derived hardiness genes. In the F² generation the percentage may be more variable, with deviation in either direction.

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