Some rose species hybrids

General Discussion
1

Just posted some pictures of a few older and newer of my species cross seedlings:
http://maprc.blogspot.com/2015_06_01_archive.html

2

Very interesting Tom. Sorry about the RRD on that last one. But it just occurred to me that you might try something similar to what is done for mosaic viruses, namely cook it. I don’t know if before or after striking roots on a cutting would work better. Does it produce suckers that might be uncontaminated so far? I was surprised this spring to have moss roses sprouting up all over the place after a contractor replaced my driveway and got dirt with roots in it from one side and used for leveling up the other. No sign of stems on what he buried, but all kinds of adventitious sprouts when I pulled them out. You might be lucky, or grow some plants from root cuttings and try heat treatment. I’d guess that a few days at 95-110 might cook out the virus. Worth a try.

3

There are some lovely foliage types there, congratulations! I’m also sorry about the RRD. Thankfully, it isn’t here…yet.

4

Thanks guys!
I hadn’t thought about heat treatment. I wonder if any of the big players in the RRD battle have considered this?
There are only just a couple suckers and they’re half buried under weeds but I’ll have to try and get them separated from the mother plant and/or take root cuttings and see if I can save it.

I hope you never do get RRD out there Kim. It would be nice if there remained places where great but susceptible roses could live in safety.
With how prevalent it is around here, I’m just trying to stay positive and consider that the silver lining is that I’ve got a great selective environment for RRD resistance! ;0)

5

Tom, I love the potential in your davidii x fedt. They all look wonderful, and I’m enjoying the assortment of foliage.

(BTW, isn’t the answer, when in doubt, “pink”? Fun cross.)

So sorry about the RRD. Haven’t encountered it yet myself, so nothing intelligent to offer up, but could cutting back affected canes really hard possibly staunch the spread? I know that puppy suckers, so if the roots stay clean…

Remind me to try to propagate some cuttings of my R setigera serena for you. I think that offers some resistance, in theory, and could be fun to work with.

Thanks for referring us back to your work. Always fun to see what you’re up to.

6

Thanks Philip!
Coincidentally, speaking of pinkness… I just got to see this white-flowered virginiana X arkansana bloom for the first time:

Also took a foliage comparison picture for the palustris X xanthina:

I’ll try to get updated pictures of the other newer stuff once I finally get the weeds pulled. ;0)

7

I once (long ago) saw a colony of white-flowered R. arkansana growing beside a country road in rural Mayetta, KS. The flowers opened poorly and didn’t take the heat as well as the usual pink types. A little over a mile away (as the crow flies) I saw some red-flowered specimens of the same species. I moved away before any hips formed.

I checked the street level view on Google maps, but the RR overpass where the red ones were growing is no longer there. No trains through there anymore.

8

Rosa palustris that I use a lot:

Bracteata hybrids: