chokecherry as prunus rootstock for softwood production

chokecherry as prunus rootstock for softwood production. double worked with interstems, this is a trial to root several hybrid plums from their softwood material. eurasia, delicate, kuban comet, mara, podarok st. petersburg. haven't heard of those? most are russian hybrids, some very complex. all seem to survive in zone 3, all have a good chance of growing as own root plum trees building on the success I've had with toka.