I don’t know if I’ve asked this or not but since it’s diploid, has anyone tried crossing The Chestnut rose with diploid chinas like Mutabilis or Comtesse du Caya or really anything very saturated? Be very interested in seeing if the leaves and traits of the species could be retained more or less aside from color of the flowers…an increased color palette on the Chestnut Rose i think could revolutionize its use in gardens - people might be more inclined to sell them in the stead of say flowering quince.
Also crossing it with Hugonis (double or single), xanthina, ‘Canary Bird’, ‘Cantabrigiensis’ yellow diploids may be interesting wouldn’t it? I mean, I think all of those shrubs should be sold in places alongside kerria and forsythia anyway.
Has anyone tried anything like those crosses? I still need to get my hands on both Chestnut Rose and hugonis and its ilk but I was curious. Chestnut rose in yellow - can you imagine?
I was wondering how it might go with ‘Harisonii’… that thing is a pollen machine! Are talking about rox. plena or normalis? If you are talking about plena then ‘Harisonii’ might help preserve the double flower structure too. I have hips forming now that are ‘Dupontii’ x ‘Harisonii’ and ‘Jersey Beauty’ x ‘Harisonii’ hoping for something yellow too.
Someone did. One of our own did, and it was with tea roses. They were pretty neat lookin.
I’m going to try Rosa hirtula (pretty much the same thing) with Candy Meidiland next year. A few from Palmegarten Frankenwhatever set seed last year, but Im not holding my breath for germination. I know it’d work on Carefree Marvel, but they have opposing bloom times =/
Pertaining to Jim’s baby’s, I’ll take the liberties of asking some follow-ups here. (Any new developments with those, Jim? It seems you said they ahd a long season, but I’m guessing not remontancy per se?)
I was surprised by the size of the leaflets in these offspring as I associate the chestnut rose with having a greater number of finer textured leaves, and wonder if the R.r. hirtula form might carry more of that fine leaf texture over to offspring, if that were of interest to a hybridizer.
Is the subgenus Platyrhodon in any way associated with the pimpinellifolias? (I’ve lost my links to phylogeny of roses that I once had.) I like the idea of working with some Pimpinellifoliae descendants, but would probably look to one with remontancy if I could. It might yield interesting foliage, no?
More to the point, however, I wanted to ask about the disease-resistance of offspring. Does R.r.'s resistance get passed on to it’s kids? And as a rose from moister regions of the orient, I’m guessing drier regions wouldn’t be to its liking.
Rosa primula, which has a lot fo similarties to Rosa roxburghii, was spotless for many years for me. Rosa roxburghii, when I grew it later, was also spotless for me. Theyre EXTREMELY aesthetic landscape pieces, in my strong opinion. All they reuqire is strategic pruning every few years, and minor tip pruning every winter.