Plums

Plums do best in rich, moist but well-drained loam or clay loam in full sun. To create a solid, productive tree, prune out weaker branches and lightly cut back a few stronger ones in spring for the first few years. This will force branches to grow in girth rather than length and to form a solid trunk. After two or three years, the tree should be well formed; after that, simply remove water sprouts, cut back overly vigorous leaders or branches, and thin out weak or crowded growth to ensure good air circulation.

Mount Royal

Mount Royal is a hardy, self-fertile Plum tree with showy fragrant white flowers in spring and loads of tasty blue, prune-plums in late summer. The fruit is great for fresh eating as well as making jams and preserves. Mount Royal is a dwarf variety at 13 ft. tall.
Tree Height: 13 ft.
Fruit Size: 2 in.
Exposure: Full Sun
Zone: 3

Pembina

Pembina is a red Plum with juicy, sweet, yellow flesh. It's half-freestone, which helps a bit with the preparation in cooking. Pembina Plum is a good choice for dessert, and it is fair for cooking and canning. Needs another variety for pollination.
Tree Height: 18 ft.
Fruit Size: 1.5-2 in.
Exposure: Full Sun
Zone: 3

Toka

A Plum tree perfect for both ornamental and fruit use, Toka bears pretty white springtime flowers followed by sweet but spicy red fruits in late summer. It abundantly produces pollen, making it a great tree for pollination of other Plums.
Tree Height: 18 ft.
Fruit Size: 1-1.5 in.
Exposure: Full Sun
Zone: 3