I was wondering if anyone here had done any breeding with Rosa Aicha as a mother or pollen parent? It doesn’t seem to be sold where I live but am interested in it’s reblooming characteristics.
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For several reasons I have not tested it a as a mother. I have never seen a hip form on it in my climate and I have not had a plant available thet I could use as a mother. It produces a lot of pollen which looks viable when magnified. Few years back I used the pollen on several repeaters. I had good seed set. However, I had no juvenile rebloom in the offspring and I have very few plants left of that origin. I was a bit happy for their hardiness but they were disease prone and had some general stuntness to their leaves (mildew?). I gave up on most of them when they did not flower in their second year. I made these crosses when I had horrible results with my germinations and I only had one to four plants of each cross. So perhaps juvenile rebloom is in there somewhere but I was just unlucky not to catch it.
Aicha is a wonderful cultivar and I would like to test it a little bit more. I would like to think it has more potential than I was able to catch. It’s offspring showed at least some hardiness.
Best wishes
Hjörtur
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Mine were the usual very vigorous, however did not have good growing experience with a pair in my zone 4A CDN prairie foothills “south facing” garden.
They never re bloomed because spent most of growing seasons re-caning due to 40-60% winter kill. Ended seasons at 4-6 foot high.
Maybe okay in your warmer zone. Use to be carried by Cornhill nusery.
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I haven’t tried breeding with Aicha yet, although I certainly should try it. Good to know it is a pollen only.
If yellow with cold hardy is what you are searching for, I was able to get that by using Kakwa pollen on a yellow shrub. Both yellow and fragrance came through in the cross. I’m still evaluating the seedling I kept to test, as it is really young still, and its first winter was mild. This winter should tell me more.
Duane
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Does anyone know where it’s rebloom comes from?
I have seen occasional flowers very late in the season on Aicha, just as I have seen occasional late flower on some few spinosissimas. I have never counted them as rebloom as such, more like a response to something or irregularity. I have seen this on Doorenbos Selection, Red Nelly, Katrín Viðar, Rosa xanthina (not necessarily the true species) and once on Aicha. Aicha is however documented to have a hybrid tea as one of its parents so I had hoped it to be able to pass juvenile and better rebloom into some of its offspring. I have not been sucessful in doing that but perhaps more crossings are needed.
Kakwa is definately on my list of roses I would want to work with. Did the Kakwa bring juvenile rebloom?
Best wishes
Hjörtur
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I only thought it had rebloom due to helpmefind saying that it does. Maybe depends on the climate itself
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I would imagine so.
Spinos and xanthina, hugonis (and hybrids like Golden Cheronese) consistently flower twice (the second is maybe a dozen or so flowers) for me here in Australia, glauca does too…so do the foetida’s.
But I wouldn’t expect that behaviour in other climates.
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It is other than Stanwell perpetual and it’s offspring the only one I think listed as reblooming as a hybrid spinosissima. I am thankful that I haven’t gone out of my way to get one knowing that might not be the case
Thanks
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Saying that I did actually import one in the end… It looked too nice 
I found an old post from 2005-2006 that someone had used it as a pollen parent resulting in 6 healthy plants. One of which rebloomed well. So it seems it does have a chance of passing on rebloom
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If Aicha is a tetraploid with two reblooming genes you would expect it to pass on rebloom to about 1/6 of it seedlings (if mated with something homozygous for RoKSN_copia), which is consistent with what you found
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What if it was bred with something like a Portland, would it still have a good chance of rebloom?
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I heavily pollinated aicha with most of my frozen pollen this season. I have 7 very large nearly ripe hips! I didn’t tag which ones they were though this year, decided to go for bulk of accuracy after having such small germination/hip rates last season
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X27 hips went into the fridge for 90 days. Then came out for 2 weeks with no germinations. Went back into the cold for 2 weeks which lead to one germination growing very slow. I assumed due to its hybrid tea ancestry that it would require the same level of stratification however it has had my worst germination rate of the season by far. In future would you recommend I stratify it longer? With my current seeds, should I remove them from the tray and do a few more months stratification at closer to 0? Please help, dont want to wait another year to potentially get no seeds or worse get seeds and them not germinate!
And good luck you took a challenge on as spinos are recalcitrant types for germination.
I am no expert on germinations that is why l broke the standard paradigm for temp… but congratulations on getting a germination on second cycle.
If your seeds were my seeds l would convince myself if they are exposed -as in baggy and moss-, no others are showing “germination” signs. If buried l have poked around very gently to convince myself none other ones have.
I would gently remove the germinated one if proto/cotolydon leaves up and running ( green) into a moist growing medium (l have and no damage done).
Back into fridge and cycle again. When l was testing l have gone up to 5 or 6. After 2 or 3 the seedlings grew into very poor quality and were tossed.
As to re stratifying temp? … imo your choice your gamble. Going to “0” never stopped moi and with one tender parent, but in my case had nothing to lose, as was afflicted with not doing the RAF 6 P’s.
Are you there yet? Don’t think so, maybe try #3 at whatever T you’re using for cold. Then if fails throw caution to the wind and dive to 0C for minimum of two weeks.
Btw aciaha not cane hardy in my zone and plants tossed.
Good luck!!!
Some people apparently claim stratify for a year … a no in my house.