Rose Hybridizers Association Forum

R. Primula, Hugonis and Xanthina do develop bronzy colored "spots" on the aging foliage prior to shedding it, but I'm not so sure it's "black spot" or not as, again, that isn't a traditional issue here. Hugonis and Xanthina get something here (sydney, australia) too but only at the dscarding leaf t...

I've started using Golden Cheronese....it didn't start setting hips til it's third year. There's a theory on these forums that the deeper yellow from Rosa Ecae is only inherited from seed, part of the reason behind using Golden Cheronese (and that R. Ecae just hasn't been accessible). The seed also ...

There's some research papers about germination being better below 15C and above freezing (so below 60F). Seems to generally hold true for me (I sow outside, often directly from hip in March/Autumn/Southern Hemisphere) and usually get a bunch of germination from April onwards (which is typically when...

Anyone know much/tried anything with 6-Benzylaminopurine or 1-Naphthaleneacetic acid? Comes up in other genus of plants, usually at 0.1% concentrations which seems to help with fertility in some cases.

Hi, David, When I did a lot of caninas, I used our natural winter here, which hovers between 33-40F, is dark, and very wet. So an outdoor temperate rainforest winter will do the trick. Only 1-2 days per winter will there be light snow, and about 1-2 weeks total have frost w/no moisture in the air. ...

Pollen pouches are separate and related by trait or class yes. To me it doesn't matter which pollen parent/s succeed or not since I'm looking for specific traits in the seedlings, ie Yellow, if the seedlings don't have yellow then it probably doesn't benefit me in my goals to keep them. Similar with...

I tend to repeat pollination, if the blooms still there why not? But I also mostly mix pollen into loose groups (ie 2n species, 4n OGR, Yellow, etc) so pollen isn't really lacking. Mostly came from some research paper about beardless iris (granted different genus and different process but who knows)...

I am more of a beginner than you, but you mention purple roses and I am over the moon with my purple floribunda Blue For You (Pejamblu). In the summer it produced many beautiful semi-double lilac-purple flowers, which hold themselves up well, no drooping, followed by beautiful large orange-red hips...

Spins are two years too (same with the diploid yellow pimps), not difficult, just slow if using as seed parent.

It should be noted that many plant trademarks and trade designations are already being used or applied in ways that are at odds with the intended purpose, since they are meant to denote a business or brand/line rather than individual varieties. That happens here in Australia too. It's interesting h...

Plum Perfect hasn't been a willing seed parent for me, sometimes but not reliably...nothing of particular interest from it's seedlings. Quicksilver only came out so can't comment on fertility, it is a lot pinker than a lot of the marketing pictures indicate which rubs me the wrong way. Another newis...

I have Many Happy Returns, it spots here not super bad but nothing special either. It can produce healthier seedlings than itself, some seem near completely spot free here but often some other issue for my conditions (ie seedling failure in extreme heat). It's probably worth someone in a more temper...

I don't seem to have downy mildew here, although I'm not sure I know what it looks like. A lot like BS. Just usually more dark purple or brown based, not as neat (any shape, very irregular where blackspot is loosely spot shaped) and leaves don't typically yellow the same way as BS. Also tends to st...

Paul Guerts E2506 sort of fits that
https://www.helpmefind.com/rose/l.php?l=2.74408.0

Based on posts he made back in 2015/2016 on these forums that was the only one that repeated, he did go on to breed it with others rugosa and rugosa hybrids (like schneezwerg and metis) but no info on those results.

So, yeah, there is something different in the repeat from rugosa roses and the repeat from china roses. I tend to agree despite some older posts on these forums suggesting they are complimentary. Calocarpa (rug x china) has been a once bloomer for me, it may still be establishing itself but hasn't ...

Re blackspot variants, maybe this was the thread

viewtopic.php?f=2&t=56480

Warren's TB seedlings are healthy, clearly it's not as problematic in getting healthy seedlings from as implied, like most things though location likely plays a role. I mean you find Schneezwerg 'one of the most disease resistant Rugosas to work with' yet here it's one of the worst, around 75% infec...

TB is being used by Warren, so sooner or later likely new TB derived plants will be on the European market so claims of obsoletion should be taken as opinion rather than fact.

No, like the above it looks more multiflora based.
The foliage is very wrong for roxburghii

Picky and difficult from most accounts. I think heat may be a factor. I had Crested Moss set seed (some are germinating at the moment) this past season. It was hot and I really threw a lot of pollen at it (often pollinated each bloom 3 times a day for several days...seemed like less effort that look...