In another thread I read that these cherries are not under patent. I believe they are grown on their own roots so grafting may not seem as practical as with other types of fruit, but I was wondering if anyone had?
I don’t know how patents work in the US but there may be a little confusion here, but the other thread was right they do not hold a patent.
BUT and this is a big but, in Canada we do not “patent” plants but they do hold what is called" Plant Breeders Rights"which is another name for a similar type of protection. These rights hold the same restrictions as a patent.
I looked the cherries up on the Canadian Food Inspection Agency site which controls the Plant Breeders Rights, and the only one of the romance series not listed was Valentine. Of the remaining cultivars they are all protected till 2032 except Juliet, which is only till 2029. 
I am only 2 hours north of where these cherries developed and unfortunately they do not do well here, too much winter kill and very weak growth for me.
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Thank you for clearing that up for me.
I’m not an expert, but my understanding of the patent law is that patent (or equivalent) protection in one country does not extend to other countries (with exceptions such as European patents that apply to multiple countries). If a breeder wants to protect their plant in the US, they need to file for a US plant patent, as, for example, Australian developers of Nadia did.
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Yup Stan you are right, and it is the same here. To protect a plant in Canada you have to buy Canadian Plant Breeders Rights. I don’t know if the U of Sask. went so far as to buy one in the USA for the cherries.
I guess it’s a swap To bad cross border sharing of scions is so difficult, we can propagate US trees and you can propagate ours.
Edible Landscaping is selling Carmine Jewel grafted on cherry rootstock.
So is it inappropriate for someone in the us to ask for scion of a romance cherry?
I don’t think so, what would you graft it to, they are usually grown on their own roots up here.
I have a lot of Nanking cherries that are already well established, just thought it might fruit more quickly and could top work ten or so with just a small amount of scion wood. I don’t even know if they are compatible.
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Won’t they just root easily? Probably cut off a branch and stick it in soil?
Good idea if they take. That should put the romance cherry on the fast track to early fruiting.
I have no idea on the compatibility with Nanking and no experience rooting them. I assume that because they are a sour cherry then any rootstock that works for the other sour cherries should work for these.
Not super easy to root, but possible with softwood cuttings, hormone, mist.
I think it might be an interesting experiment, also if you did not want it to sucker although I don’t know how big an issue that is.
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Resurrecting this thread, has anybody here successfully grafted or rooted CJ? Has anyone grafted it to a standard sweet or sour cherry? And since it’s typically grown on its own roots how would you go about rooting it? Air layering? Cutting suckers?
CJ does sucker once in a while. I grafted a CJ scion to my Bing cherry and it took for one season but then runted out.
Tony
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Do you think thats just bad luck or do you think they are incompatible?
Thousands of CJ’s are sold each year on their own roots. How are they propagated?
I have rooted CJ in mid summer using semi lignified cuttings, with hormone and mist or just kept in humid shaded location. Root cuttings would no doubt work too.
They probably use the combination of Tissue culture, suckers, and green wood cuttings to root.
Tony