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I was given these roses many years ago by someone, but they also had no idea which ones they were? They grow long canes, and bloom in Summer, then stop, and bloom again in Fall. Flowers are usually pink and white, but once in a while i'll get an all white ot all pink flower. Also, instead of the usual 4-5 petals, double petaled roses have magically been appearing on the canes at random.
I have also tried for 3 years to cross breed this rose (with it's frequent blooming flowers), with a Multiflora rose (for it disease resistance and large amount of smaller flowers). Every year early Summer I remove the petals from the almost opened rose, and remove the stamens, then after 24 hours apply the multiflora rose pollen to my roses (making sure that no other pink roses with stamens are blooming to ruin the hybridization) The rose hips seem to take, but after a week all shrivel up and die. It makes no sense?
I'm afraid I can't be much help. I don't recognize your mystery rose. Do both of the potential parent roses normally set and hold hips? There are quite a lot of roses that normally don't. Have you tried crossing the two roses both ways?
Yes, both of these roses set hips very well, to0 well as a matter of fact and the birds eat the hips and the roses grow everywhere.
I have not been able to cross both ways. See the pink rose is growing in my garden. The other species of rose with the small white flowers grows wild at a park nearby and is not growing in my yard. I cant pollinate those flowers and expect to guard the rose hips from birds, so I collect blooming white flowers to bring to my house to pollinate my pink rose plant.