Plum Tree

Select a site with full sun and well-drained soil with a pH of 6.0 to 7.0. European plums are more cold-hardy and upright, while Japanese plums bloom earlier and are better suited to milder climates. Because many varieties need cross-pollination, plant at least two compatible cultivars within 50 feet of each other. Space standard trees 20 feet apart and dwarf varieties 10 to 12 feet apart.

Plant bare-root plum trees in late winter or early spring while dormant. Set the graft union 2 to 3 inches above the soil line and water deeply at planting. Apply a 3-inch layer of organic mulch around the base, avoiding contact with the trunk. Water regularly during the first growing season, providing about 1 inch per week. Plum trees establish more quickly than most stone fruits and often begin bearing within 3 to 4 years.

Prune European plums to a central leader shape and Japanese plums to an open vase form. Remove water sprouts, crossing branches, and dead wood in late winter. Thin heavy fruit clusters in early summer to one fruit every 4 to 6 inches to prevent branch breakage, improve fruit size, and reduce the tendency toward biennial bearing. Monitor for black knot disease, removing infected branches promptly.

The European plum (Prunus domestica) is believed to have originated as a natural hybrid between the cherry plum (Prunus cerasifera) and the blackthorn or sloe (Prunus spinosa) in the region surrounding the Caucasus Mountains and the shores of the Caspian Sea. Archaeological evidence suggests that plums were among the earliest fruits gathered by humans, with dried plum remains found at Neolithic sites across Europe and western Asia. The Romans played a significant role in spreading plum cultivation throughout their empire, introducing improved varieties to Britain, Gaul, and the Iberian Peninsula. Pliny the Elder documented several named plum varieties in his Natural History, indicating that selective breeding was already underway by the first century CE. During the medieval period, monasteries became important centers for preserving and improving fruit tree varieties, and plums were widely grown in monastic orchards across France, Germany, and England. The Crusades brought additional varieties from the Middle East back to Europe, enriching the genetic pool. By the Renaissance, plum cultivation had become highly refined, particularly in France, where the Agen region developed a thriving industry producing dried prunes from the Prune d'Ente variety that continues to this day. European colonists carried plum trees to North America in the seventeenth century, where they encountered native wild plum species already cultivated by Indigenous peoples. The nineteenth and twentieth centuries saw extensive breeding programs that produced many of the modern dessert and culinary varieties grown today, including popular cultivars like Victoria, Stanley, and Italian Prune. Today, the leading producers of European plums include China, Romania, Serbia, and the United States, with California being the dominant production region in North America.

Plum trees grow in a wide range of well-drained soils with a pH of 6.0 to 7.0. European plums tolerate heavier clay better than Japanese types. Apply a balanced 10-10-10 fertilizer in early spring, about 1 cup per year of tree age up to 6 cups maximum. Excessive nitrogen promotes soft growth susceptible to disease and delays fruit ripening. Supplement with potassium for better fruit quality and winter hardiness.

European plums are ripe when they soften slightly, develop a powdery bloom, and separate easily from the stem. They can be picked slightly firm for drying into prunes. Japanese plums ripen when they develop full color and yield to gentle pressure but still have some firmness. Taste-test for sweetness before harvesting the whole tree. Pick with stems attached to extend shelf life. Plums ripen over 2 to 3 weeks, requiring multiple pickings.

Fresh plums keep for 1 to 2 weeks refrigerated. European plums are traditionally dried into prunes, which keep for months at room temperature. Halve, pit, and place cut-side up in a dehydrator at 135 degrees for 18 to 24 hours. Plums make excellent jam, preserves, and chutney. Japanese plums freeze well when halved and pitted. Plum butter is a traditional European preserve cooked slowly until thick and spreadable.

European plums are the classic choice for drying into prunes, making jam, and baking in tarts and cakes. Japanese plums are best eaten fresh or used in salads and salsas. Damsons are prized for rich plum jam, damson gin, and the traditional British preserve called damson cheese. Plums pair well with cinnamon, ginger, star anise, and duck. They are a good source of fiber, vitamin C, and potassium.