141-09-02: un-named diploid X 'Home Run'

141-09-02: un-named diploid Polyantha X 'Home Run'.

The rose used as a seed parent in this instance is a diploid Polyantha developed by David Zlesak and shared with me for breeding purposes. I don't have any record of its exact parentage, so I best not quote what I remember in case I'm wrong! The Zlesak Poly is a cluster flowering dwarf plant halfway between a Polyantha and a modern miniature in style, with clusters of 2" double, cupped crimson blooms bearing a pale, near-white reverse. To my nose, it offers a very respectable "fresh" scent. It is a very attractive little shrub and I hope David might consider it as a legitimate garden shrub of commercial value.

I used the "Z Poly" last year in conjunction with a number of other diploids with the goal of maintaining a strongly pigmented diploid line. I also included Carruth's 'Home Run' in the list of pollen parents, as it is a triploid and will presumably give both haploid and diploid pollen grains, and so this cross, 141-09, should include a mix of diploid and triploid offspring.

Many of the 141-09's were very good in terms of color, vigor and foliage. I selected about 15 seedlings for evaluation. Most are in shades of deep red or crimson, and most are singles or nearly single. All appear to be cluster blooming and many seem to have inherited much of the growth habit of 'Home Run', which I'm not altogether pleased with. (I find 'Home Run' to be a rather homely shrub as regards its architecture)

Next year the best of the 141-09's will go outside into the open garden to establish for disease resistance evaluation. This is a high priority matter with this group of seedlings, as I am determined to develop my own line of shrubs that carries near 100% immunity to "the big three" fungal diseases. We can hope, anyway.....

Bracteata line breeding.

It seems to me that line breeding is rarely pursued in the breeding of roses. In part, I expect this is because undesirable recessives start to show up and loss of hybrid vigor becomes an issue as well. Still, many of the Canadian Explorer roses rely heavily on line breeding, making extensive use of the 'Red Dawn' X 'Suzanne' line and the 'Kordesii' line, and with great success.

Well, I have been working with the Moore line of Hybrid Bracteatas for several years now and it has become very clear that the biggest battle with these is getting decent color out of them. Ralph Moore's most attractive hybrid of the group (for me) is 'Out of Yesteryear', whose parentage is 'Sequoia Gold' X 'Muriel'. 'Muriel' is Moore's first successful cross using R. bracteata (crossed with 'Guinee') that was fully fertile and able to carry forward the line. 'Muriel' is a tetraploid, as is 'Sequoia Gold', but when these two were crossed, 'Out of Yesteryear' resulted and it turned out to be a triploid! How two tetraploids mated to produce a triploid is a bit of a mystery, but there you have it. Even more interesting, 'Out of Yesteryear' is a fully fertile triploid, contrary to the mytholgy of triploids being infertile. You can use its pollen on pretty much anything and get loads of seedlings from it.

I've done plenty of crosses with 'Out of Yesteryear' over the years and there are some excellent traits it passes on, and some not so great ones. Its offsrping tend to have excellent vigor, beautiful foliage and often very beautiful blooms packed with petals. Many are often fragrant as well. However, seedlings can be very thorny, the petal texture too thin and rarely do you get anything with strong coloring. Many seedlings are just white. So when I get a seedling that has decent color, I'm inclined to explore it as a stepping stone towards Bracteata hybrids with good color, which leads me to these two.

174-02-17 = 'Sheri Anne' X 'Out of Yesteryear'. One of its siblings tested as a tetraploid and I suspect this is also. It is a thorny plant that is more horizontal than vertical, with smallish glossy foliage. It blooms at many nodes along the previous season's canes and can bloom in large clusters sometimes. Blooms have a vaguely HT shape when in bud (see photo) but open to a flat 2.5 inch shape. Color is a medium red in bud, fading to a pale red/pink. It sets seed with most any pollen, but seed fertility is low at about 10-20%. However, when it does produce seedlings, a high percentage of them has something about them that warrants further evaluation. Offspring tend to bloom in big clusters with compact, graceful architecture and good color. One of my favorite new shrubs came from a cross of 174-02-17 X 'Hot Cocoa'. (More about this soon)

33-03-03 = 'Twilight Skies' X 'Muriel'. Why, you might ask, did I select the mauve miniature 'Twilight Skies' as the parent for this cross? Because it was there! I had grown it for two years when it was new and it set seed readily, bloomed like mad, so I thought why not? It was untested and might have qualities that would make it worthwhile as a parent. The seedlings from this group were mostly lavender/pinks with one coral colored one in the mix. Several were grown for two years and all but 33-03-03 were discarded for poor vigor or unattractive blooms. 33-03-03 is a semi-climbing plant with dark green glossy foliage and 2.5" medium red blooms that fade to a reddish pink with age, about 25 petals, cupped in form. It blooms in clusters all along the arching canes, repeating in flushes through the year. David Zlesak kindly did ploidy tests on some of my Bracteata seedlings for an article we were co-authoring*, a few years back and it turns out that 33-03-03 is a tetraploid. It is fertile in both directions and should be compatible with most other tetraploids.

174-02-17 and 33-03-03 happen to be growing side by side in one of the greenhouses, both descended from R. bracteata through 'Muriel', and both were selected for their relatively strong coloring. Yet it never occurred to me to cross the two together....until now. The idea (and hope) here is that some of the more interesting Bracteata traits might be reenforced while retaining the vigor, repeat blooming habit and red coloring of each. Anything could happen of course. I might end up with a load of diseased seedlings with no vigor and no rebloom. Its possible the seeds might not even germinate, assuming I get seeds at all! We shall see.

*See: Bracteata Gene Counts Article

Today's big pollen donor.

'Gloire des Rosomanes, by Plantier circa 1825 and introduced by Vibert in 1836. It is sometimes listed as a China, a Bourbon or even a primitive Hybrid Perpetual. Fully remontant, relatively disease free in most climates, and a lovely scent. It is a known triploid, and yet contrary to popular mythology it is highly fertile. In fact, it is responsible for numerous hybrids, involved in the pedigree of 7264 unique hybrids to date. Most of these came down through 'General Jacqueminot', the famous "red" Hybrid Perpetual. Today, I have been slapping 'Gloire des Rosomanes' pollen on numerous plants, to see what variety of results I get using it on modern hybrids. Its the "old dog, new tricks" school of thought.

Anyway, very busy day for me, I have been up since 5:30 AM and have been pollinating since 6:30 (through till 12:30 PM!). And now, I must go attend to watering chores. Ta!