@Seamonkey84 The Prime-ark series is 4x and two genes are involved so double back crossing is required . Rubus ulmifolius is thornless and might be a good candidate.
This is my Polar Whites second year flowering and It did so with gusto. It did not however set many fruitlets. I cleared my property of most of the wild blackberryās. The pollination options where limited to a black cap raspberry which fully set about a dozen fruits. Fortunately my Burbank white is growing well this year so both should flower next year for proper cross pollination.
Probably at least. I myself hate the way the polar berry tastes. I donāt think it is very good at all. Now Burbanks white Blackberry is low acid and high sugar. I much prefer Burbanks. Although Polar is a small berry Burbanks are smaller than raspberries. A very tiny berry. His final white was supposed to be bigger. I think I might have one of the berries he rejected? As it is not very large. I removed other whites and only kept this one, well i removed it, but it came back. I decided to let it be. All my whites came from growers not nurseries. So maybe Polar is better? It looks like the white I had that tasted terrible.
That should be easy since most cultivars have very few thorns already.
So with the prime ark line, Iād have to back cross several times for the thornless and possibly fall fruiting?
Sorry to hear the flavor of the polars arenāt as good, I was thinking about the Burbank one but I wanted bigger berries and erect cane. If I was to cross it with Ponca (when it becomes available) maybe that would help it along and get some white/yellow berries down the line.
Reading Burbankās description of selecting a white blackberry is an education in doing the right things for breeding while failing to understand the process of segregation. White berries - based on his information - are a result of at least 3 and more likely 4 individual mutations. In a cross of white X black, you will have to grow out at least 64 F2 offspring to have a chance of selecting a white fruit and 256 to get white combined with thornless. This depends on whether or not thornless is linked with one of the genes for white. If linkage rears up, it might take several hundred or even a few thousand plants to get the desired combination.
I have some trailing blackberries growing all around the neighborhood that are now popping up in my back yard. They look like Rubus ursinus, but I am not an expert. If they are Rubus ursinus, does this mean there is a male nearby, or can they be pollinated by Himalayan blackberry? I read that Rubus ursinus is dioecious. Is there a way to identify a male from a non-bearing primo-cane, when they are not flowering?
These are growing at the base of a holly tree, competing with ivy. I stepped on the one bramble before I realized it was loaded with fruit. The holly tree is a dumping ground for boulders, rocks, bricks, and concrete chunks.
I have no idea what the quality is yet, but would cultivation improve size and yield significantly? They are growing on the North fence, under the holly tree, but out of the house shadow. They donāt get much direct sun. I am surprised they are not diseased, with the bad light and airflow. They do have bites from those little green fleas that also love our roses.
Would it be worth the trouble to propagate these seeds? If i can get them before the birds, lol.
I think I found the male growing ~ 25ā away, hiding in some Himalayan blackberries I have been battling. The only flowers with no berries in them. They are packed with large stamens.
Iām Keen on fruit varieties for the Kenai Peninsula of Alaska
Ribes and Raspberries.
I know at least they can handle it
Viburnum Trilobum does also, but the quality is not high.
I picked a few berries this morning. The ones getting ~3 hours of sun were 9 brix, and the ones getting 5-6 hours were 11 brix. I am going to see if they improve with a little hanging. These were solid black all day yesterday. The flavor was pretty good for growing wild. They were sweet-tart like a strawberry, and the seeds were very much like large strawberry seeds. At first I thought they might be seedless; the seeds are that inoffensive. If they improve with cultivation, I think they would be great for fresh eating.
Well manually pollinate a few blossoms and save the seeds if it fruits. Problem is going through the trouble of emasculating the blossoms so they donāt self pollinate. Well then again thatās the whole point of this topic lol.
