Friday, August 13, 2010

118-09-14: from R. pisocarpa

In June of 2009 I selected one of the local plants of R. pisocarpa to act as a pollen parent in a few crosses. R. pisocarpa is supposedly a diploid (14 chromosomes) which made it more attractive as a mate to some of my other diploid hybrids. This particular clone was a particularly dark pink form, with a compact habit. This pollen served as the male parent of the seedling shown here.

The seed parent, 42-03-02, is a selfing of Ralph Moore's Wichurana breeder 0-47-19, presumably also a diploid. I have used this plant in breeding a few times in years past with mixed results, but I was most often crossing it with tetraploids. Now I limit myself to pairing it with other diploids. (I have seedlings from it using 'Therese Bugnet' as a pollen parent, to name just one)

So, what is remarkable about this seedling? The fact that it is a repeat bloomer, flowering in its first year. Normally you would not obtain any repeat bloomers from a first generation cross with a native species, but it appears this R. pisocarpa has some secrets up its sleeve! Whether the plant has any merit as a garden shrub or as a stepping stone to better hybrids is yet to be determined, but this seedling makes me hopeful.

Click on thumbnails for a larger image.

118-09-14 is still a fairly small plant in a gallon can, with canes no more than 14" long. The foliage, architecture and overall "feel" is intermediate between the two parents, but leaning a bit more towards R. pisocarpa in my opinion. The foliage has been very clean so far, but I reserve judgment until it has lived out in the test garden for a while. (With R. wichurana strongly represented in its pedigree, plus 1/2 R. pisocarpa, I'm hoping for good disease resistance) The blooms have a fairly strong powdery scent, not unlike 'Marie Pavie'.


  1. Doesn't look very thorny from the second photo either.

  2. Simon,
    Thats true, and in fact, several of this lot appear to be nearly thornless! That will change with time, no doubt.....