Purple Pavement x Rosa pomifera
My local botanist friend did a series of Purple Pavement x Rosa pomifera and Rosa pomifera x Therese Bugnet crosses.
The downy foliage was dominant both ways. In both directions, most seedlings have had a much shorter stature than if PP or TB were selfs. I found this interesting. Unlike his prior Purple Pavement x Leonie Lamesch trial batches, any attempt for a secondary diseases (anthracnose, downy, cercospora, canker, etc) were not found or just a simple pin dot size from resistance. All PP x LL seedlings were destroyed for how prone they were, in fact. PP x LL were also much larger plants than PP x R. p. despite Rosa pomifera being larger than Leonie Lamesch. Some interesting genetic sorting going on!
The two Rosa pomifera we have came from Forest Farm. They obviously raise by mass seed. I find this useful because if a strain proves infertile, there are more to try from the same source. And, as always, resistances can vary within a species.
I forgot to mention.
The botanical we got Rosa californica from also had pinetorum. We wanted the pine rose, but after reading it is often susceptible to downy, we opted for the californica due to image searches online. Image searches are useful for looking at locals, and we chose a California botanical, that seems to no longer sell online (???). The selection they sent us has foliage like sand paper, and a lot of prickles with small californica blooms. Apparently this species has a wider variation than most. After 4 years with it, zero downy. For a species, this is uncommon and I thought it worth noting.
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Would that be the same one as R. Villosa ? I’ve that one marked as pentaploid with canina-meiosis. Did the offspring also inherit the slightly fragrant foliage of R. Villosa?
Yeah, Apple Rose.
I will have to smell the foliage. We’re both 6’3" and the seedlings are knee-height, so you can see how this was passed over lol. The TB hybrids are more down grey, which I think is neat.