This is such an exciting direction in crosses; one of the parents in this is White Knight, which is understandable...the other parent is Christmas Snow, which is an incredibly interesting hybrid.
The reason why it's so interesting to me is that it is the result of pollen saving. One of its grandparents is the summer-blooming Albion, which is heavily infuenced by niveum, and is something everyone should have in their collections. Basically, Christmas Snow results from the typical line of breeding whites, just tweaked a little - instead of F.C. Puddle - type whites crossed with greens, it's an Albion - white crossed with a heavy-substanced pure yellow (from Bordube 'Eau De Nil', if you recall my previous post). I think that using Albion and heavy-substance yellows could add fertility back to whites. And then on top of that you could eventually get summer-blooming complexes. I have to admit during the summer I do get tired of looking at all the "lettuce" in my greenhouse...
In any event a most interesting cross...some really special clones there; yes they're small, but they have good form and they may well be fertile...