Plums

Home growers have two main domesticated plum species to choose between, plus a hardy native group, and each behaves differently in the orchard. European plums (Prunus domestica) — the group that includes Stanley, Italian, Damson, and the prune-types — originated around the Caucasus and Caspian Sea and have been cultivated in Europe for more than two thousand years. They are upright, vase-shaped trees with smaller oval fruits, generally blue or purple-skinned with golden flesh, and many are self-fruitful and high in sugar (the prune-types are dried whole without pitting). Japanese plums (Prunus salicina) originated in China and were domesticated in Japan; Luther Burbank introduced and bred most of the commercial cultivars after their arrival in California around 1870. Japanese plums are the round, juicy, red- or yellow-fleshed plums of the produce aisle — earlier-blooming, lower-chill, and most require a pollinator. American hybrid plums — crosses with native species like P. americana — extend hardiness to zones 3 and 4 where neither European nor Japanese plums can survive.

Across all three groups, plums are among the more forgiving stone fruits for a home grower. Trees are smaller than peaches or cherries, come into bearing in three to four years, and most varieties produce reliable crops on dwarfing rootstocks like Krymsk 1 or St. Julian.

The two things most worth knowing before you plant. First, pollination groups don't cross: European plums pollinate other European plums, Japanese plums pollinate other Japanese (and many American hybrids), but European and Japanese rarely cross-pollinate each other due to mismatched bloom times and incompatibility. If you plant only two trees, both should be in the same group. Second, plums are highly susceptible to brown rot in humid climates, especially Japanese types. Good airflow, careful pruning, and prompt removal of mummified fruit are the foundation of disease management. The variety and pollination sections below address both.

Plums span a wider range of types, uses, and climate adaptations than almost any other common tree fruit. The distinction between European and Asian plums runs deeper than just flavor — they have different pollination systems, different climate preferences, different textures, and different best uses in the kitchen. Choose your type before you choose your variety.

Specialty types worth knowing

Damsons (Prunus domestica insititia) are small, tart, intensely flavored plums — technically a subspecies of European plum — that are superb for jam, jelly, preserves, and sloe-style liqueurs. They are often self-fertile, naturally compact, highly disease-resistant, and among the most reliable plums in the PNW's cool maritime climate. Their tartness makes them unappealing for fresh eating, but in the kitchen they are unsurpassed.

Mirabelles are small, golden to yellow-orange European plums with an intensely honeyed, complex flavor. They are beloved in French cuisine for tarts, preserves, and eau-de-vie. Mirabelles require another Mirabelle variety for pollination — they are not reliably pollinated by standard European plums — making the pairing requirement non-negotiable. They are less commonly grown in North America but perform well in PNW conditions where summers are warm enough to ripen them.

Plum trees are grafted, and rootstock choice affects not just final tree size but also soil adaptation, vigor, and how quickly the tree comes into bearing. Unlike cherries — where Gisela dwarfing rootstocks have become dominant — plum rootstock options are somewhat less standardized, and the best choice depends on your soil type and the variety being grown.

Pollination planning is the most important pre-planting decision for Asian plums, and an important consideration even for self-fertile European plums. The core rules: European plums are pollinated by other European plums, Asian plums by other Asian plums, and Mirabelles by other Mirabelles. No reliable cross-type pollination can be counted on. And while many European plums are technically self-fertile, yields are consistently and meaningfully higher when a compatible partner is nearby — for all types, two trees is always better than one.

European plum pollination

Every European plum below is pollinated by any other European plum that is in bloom at the same time. Bloom overlap is the thing to check — ripening dates are not a guide to it, since an early-ripening variety is not necessarily an early bloomer.

Raintree carries an extensive range of plum cultivars chosen for flavor diversity, regional adaptability, and proven home-orchard performance — including the largest selection of European plums and gages in the U.S. The varieties below are currently part of the Raintree catalog; specific availability varies seasonally. The two main groups, European and Asian, have very different climate needs and bloom timing — choose your group first, then narrow to varieties.

Pacific Northwest recommended — European plums

Pacific Northwest recommended — Asian plums (warm/sheltered sites)

Plums require full sun — at least 8 hours per day — and perform best in well-drained soil. While they are more tolerant of heavier soils than apricots or cherries, chronically wet or poorly aerated ground leads to root stress, bacterial canker, and silver leaf disease. A slightly elevated site with good air movement is preferable to a low, sheltered location where cold air and moisture collect.

Soil pH of 6.0–7.0 is ideal for most plums. Plant with the graft union above the soil line. When planting, improve the broader area around the hole rather than creating a single rich pocket — plum roots spread widely and benefit from well-structured soil beyond the immediate planting zone. Apply mulch to a radius of 3–4 feet from the trunk, keeping it a few inches away from the bark to reduce crown disease risk.

Chill hours and hardiness

European plums are hardy in USDA Zones 4–9 and typically need 700–900 chill hours. Asian plums cover a wider range — some varieties need as few as 200–300 chill hours, making them suitable for mild-winter climates in Zones 5–10. Chill hours are rarely a limiting factor across most of the PNW, where most sites comfortably exceed the requirements of all common plum types.

Young plum trees need consistent moisture while establishing — approximately 1 inch per week during active growth, adjusted for rainfall and soil conditions. Water deeply and infrequently to encourage deep rooting. Established plums are fairly drought-tolerant in the PNW's maritime climate, but consistent irrigation during fruit sizing in July and August improves fruit size and quality, particularly for Asian varieties.

Feed lightly and conservatively. Excessive nitrogen produces lush, soft growth that is the most susceptible tissue for both bacterial canker and silver leaf entry, and it can delay or reduce fruiting. A light application of balanced fertilizer in early spring is typically sufficient for established trees. Monitor annual shoot growth: healthy non-bearing trees grow 18–24 inches per year; bearing trees, 10–15 inches. Vigorous growth well above these ranges may indicate over-fertilization.

Plums are traditionally trained to an open center (vase) shape — 3 to 5 strong scaffold branches angled outward from a low trunk, with no dominant central leader. This structure maximizes light penetration into the canopy and promotes good airflow — both critical for disease management in the PNW's cool, moist climate. Establish the scaffold structure in the first two to three years and maintain it with annual thinning cuts thereafter.

Each year, remove dead, damaged, or diseased wood; strongly upright water sprouts competing with the scaffold; crossing or rubbing branches; and crowded interior growth that blocks light and airflow. Aim to keep the center of the tree open enough to "throw a hat through," as the old orchardist saying goes. Wide crotch angles (45–60°) on scaffold branches provide stronger attachment and earlier fruiting than narrow, upright angles.

Unlike pears, plums ripen best on the tree and should not be picked early. The signs of ripeness are: full color development (including a waxy natural bloom or haze on the skin), slight give under gentle finger pressure, easy separation from the spur with a gentle upward twist, and — most reliably — flavor. A ripe plum tastes sweet and fully developed; an underripe plum tastes starchy or sour regardless of its color.

Harvest selectively over 1–2 weeks as individual fruit reaches peak ripeness, rather than stripping the tree all at once. European plums for fresh eating should be picked at full softness; those intended for drying can be allowed to become very soft and sugar-concentrated on the tree before picking. Handle fruit gently — plums bruise easily and bruised spots deteriorate rapidly.