Citrus > Cold Hardy Citrus

F2 citrange winter hardiness trial

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David Kipps:
"A few dozen of these seedlings survived a low temperature of -12F."  How much visual diversity did you observe among these?  Did they lean heavily toward looking as though they inherited an unfair share of trifoliata?  Did you get any mono-foliate? No/short thorns? Odd colors? Etc.?

There is considerable variation among the trees. The very hardiest phenotypically favor Poncirus. There are 2 trees that are phenotypically more citrus like. These 2 are less hardy. Most are heavily thorned, but one or 2 are less thorny. The 2 less hardy trees are mostly monofoliate.

A rather quick inspection of a number of selections planted outdoors and which remained outside over the past Winter, have shown the following order of hardiness following a sustained low temperature of 2 degrees during high winds:

1. Poncirus   Only damaged on late season growth.

2. Poncirus Plus    Also only damaged on late growth.

3. Conestoga 011 Segentrange    A little damage on late growth, similar to Poncirus late growth. Tetraploid

4 Conestoga 010 Segentrange   Survival very close to that of Poncirus and is breaking buds, flowering

5. Conestoga 006 Segentrange  To this point is indistinguishable from 010, is also flowering.

6. Conestoga 026 Segentrange Also appears similar to 010 and 006, fruited last year. Is marginally less hardy than the Selections listed above.

7. Conestoga 001 Segentrange Semi-evergreen, the first flush of leaves in the Spring are distorted, may relate to the absence of true Winter bud scales. No bark cracks seen.

8. Conestoga 067 Segentrange The second most Citrus-like in appearance survived with injury.

9. Bishop Citrandarin heavily damaged, but likely to survive.

10. 1279 Citrandarin heavily damaged, may not survive.

11. 058 Segentrange Very Citrus-like in habit, vigorous, hardiness is not exceptional, damage at 15 degrees in tunnel.

Bishop seedlings displaying monofoliate leaves. There may be 2 trifoliate zygotic seedlings for each monofoliate seedling. Very likely there's also a percentage of Nucellar seedlings present.


Zygotic Meyer Lemon x 026 Conestoga seedlings showing variation in leaf form s.


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