This section is from the book "The Gardener's Monthly And Horticulturist V21", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
Some years ago there was considerable demand for plum trees budded on the wild Western or Canadian plum; but nurserymen found it very hard to get a good " take," and I imagine few are now grown. However, should any one desire to bud plums of the wild or Canadian kind, I would say that they can be worked as successfully as any variety, by budding just as the growth is ceasing, or as late as the bark will slip freely. The union is then as quick and sure as with any plum. I have often grown as solid blocks on wild plum stocks as on horse plum, by taking care to bud at a time when the plant was just entering a " rest," and hence was forming wood fast.