Fruitwood nursery has a pretty decent selection of hawthorn scion wood including gold azarole. Never tried grafting it myself but I imagine it's similar to grafting apples and pears which aren't too fussy.
If I need any more hawthorns I will keep that in mind... however, I randomly checked Wanderlust Nursery (
www.wanderlustnursery.com) and THEY were selling grafted trees of Crataegus pubescens... of course, I bought two. I can't believe my luck, nobody else is selling it from what I can see. Massive props to them.
So let me mention what this is for. Crataegus and Mespilus (medlar, specifically Mespilus germanica) are two closely related genera. Medlar is obscure enough, but I was able to locate and obtain 3 Stern's medlar, which was a Crataegus/Mespilus hybrid found growing on a now-wild stretch of land. Information on Stern's medlar is severely lacking, and it's not known what hawthorn was used as the parent or how this plant even came into being... very itneresting story. The most interesting thing is that Stern's medlar fruit is said to be glossy red, as opposed to the pear-brown of medlar. I'm trying to create a crossbreed that may result in a yellowish medlar, and if it would have any effect on the fruit size/quality of the medlar. Medlar can grow in most of the USA as it is a temperate plant, one of the few temperate plants I would view as exotic.
Actually most of the whole rose family interbreeds easily, so I also obtained a Karp's Sweet Quince and Mountain Ash Rabina as well to see if I can crossbreed them and get any interesting results.