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Post by mikkel on Nov 10, 2020 5:07:36 GMT -5
a F2 seedling of SP Urban SP Urban F1 is a C. limonia "Otaheite" x C. ichangensis cross
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Post by ilya11 on Nov 10, 2020 9:03:01 GMT -5
How hardy is it?
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jibro
Full Member
Czech Rep. | USDA 6b
Posts: 163
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Post by jibro on Nov 10, 2020 9:51:35 GMT -5
As far as I know, nobody tested it yet, it is supposed around -10°C(14F) it's actually C. ichangensis x Otaheite acidless Rangpur lime cross, Ichangensis was a seed parent. Fruits are edible with a sour taste, no bitterness, but there are too many big seeds inside, so it's not much usable. Photo from Czech grower K. Mundl  |
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Post by mikkel on Nov 10, 2020 10:09:52 GMT -5
this will be its first winter. But I will protect it this winter. I think it is still too small.
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jibro
Full Member
Czech Rep. | USDA 6b
Posts: 163
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Post by jibro on May 4, 2022 4:20:08 GMT -5
Hi Mikkel, is your SP Urban still alive? I am interested what minimum temperatures were exposed during the last two winters and if were damaged...I tested my SP Urban seedling during the last two winters in an unheated greenhouse and it has only very minor damage but the minimum temperature was only - 8°C (17.6 F) in 2020/21 and - 7°C (19,4 F) last winter.
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Post by mikkel on May 4, 2022 9:56:21 GMT -5
this winter, although much milder than the last, it has suffered more, but it is still alive. only 1 single night with -10°C
20/21 there were longer colder temperatures. Unfortunately, I can't find the chart right now.
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jibro
Full Member
Czech Rep. | USDA 6b
Posts: 163
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Post by jibro on May 4, 2022 13:35:23 GMT -5
That's a lot of damage for one night with -10°C, SP Urban is probably less hardy than I thought maybe only around - 8°C...
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Post by mikkel on May 5, 2022 1:30:56 GMT -5
I think it's not just the temperature. The winter of 20/21 was longer and colder, even down to -10 or -13°C (depending on location) but it survived much better. I think the cold this year came too fast. the winter before got cold slower and was more consistently cold. Many of my plants in the garden have suffered more this year than the winter before....
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Post by radoslav on Jan 10, 2023 7:07:35 GMT -5
As far as I know, Mr. Urbans goal was quite opposit. He wanted to create rootstock for indoor growing.
SP is acronym for Special rootstock in czech.
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