Plum Tree

A productive stone fruit tree available in European and Japanese varieties, with European types being best for drying into prunes. Many plum varieties require a cross-pollinator, so check compatibility before purchasing. Thin fruit clusters in early summer to prevent branch breakage and improve fruit size. Plum trees are relatively low-maintenance compared to other stone fruits but should be monitored for plum curculio and black knot fungus.

Plum trees are propagated by budding or grafting named varieties onto compatible rootstock. Myrobalan plum rootstock is common for standard trees, while St. Julien A provides semi-dwarfing. Purchase grafted bare-root trees and plant in late winter while dormant. Plum pits can be cold-stratified and grown, but seedlings are highly variable and may not produce quality fruit. European plums typically bear in 4 to 5 years on grafted trees, Japanese types in 3 to 4 years.

The Season Plate

Your Plum Tree Year

Composed for Zone 7 · typical seasons · frost passes Apr 2, returns Nov 1

Sow Plum Tree Mar – Apr, Nov, pick Jul – Sep. Set your climate below and every date on this plate re-times itself.

Sowing window

Mar – Apr, Nov

re-timed to your frost dates

Plant out

after Apr 2

once frost risk has passed

First picking

around Mar 14

≈ 1095 days from sowing · 25 to per plant

Composed for —ColdTemperateMildWarmUse my locationUsed once to set your season · only the zone is kept

Week-by-week Plum Tree reminders watering, feeding and pruning, timed to your dates

In the app

Frost alerts for your garden a warning before a cold night costs you the crop

In the app

Succession sowing dates so the picking never gaps mid-season

In the app

Keep my dates — free for 7 daysWe nudge you as each window opens · cancel anytime

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.

Garlic, chives, and alliums planted beneath plum trees deter borers and aphids. Marigolds and calendula attract beneficial insects. White clover between rows fixes nitrogen and provides pollinator habitat. Avoid planting nightshades near plum trees. Comfrey is an excellent companion, its deep roots mining nutrients and its leaves providing potassium-rich mulch when cut.

The Society Table

Garlic belongs beside it. Walnut Tree doesn't.

Old growers' knowledge, checked against Plum Tree's real companion table below — test any plant you're growing.

Grows well in the company of · 3

GarlicChivesMarigold

Keep apart · 1

Walnut Tree

Plant Plum Tree with good neighboursThe planner flags conflicts before they're in the ground

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.

Ideal Temperature

Hardiness Zone Compatibility

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.

Storage & Preservation

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.

Troubleshooting Common Problems

Black knot disease is the most serious ongoing challenge, requiring vigilant pruning and removal of infected wood. Fruit cracking from heavy rain near harvest affects thin-skinned Japanese varieties more than European types. Heavy fruit set leading to branch breakage is common when thinning is neglected. Poor pollination causes light crops in varieties that are not self-fertile. Bacterial leaf spot causes defoliation in warm, humid climates.

Growing Tips

1. Plant plum trees in a sheltered, sunny position that receives at least six hours of direct sunlight daily. South or southwest-facing slopes are ideal because they warm up earlier in spring while providing some protection from cold north winds.
2. Choose a well-drained soil with a pH between 6.0 and 7.0. Plum trees are less tolerant of waterlogged conditions than some other fruit trees, and standing water around the roots can quickly lead to root rot and tree decline.
3. If your chosen variety is not self-fertile, plant a compatible pollination partner within 15 meters to ensure good fruit set. Popular self-fertile varieties include Victoria, Stanley, and Italian Prune for those with space for only one tree.
4. Water newly planted trees deeply once a week during their first two growing seasons to establish a strong root system. Reduce watering frequency for established trees but provide deep irrigation during prolonged dry spells, especially while fruit is developing.
5. Apply a 7 to 10 centimeter layer of organic mulch around the base of the tree each spring, keeping it at least 10 centimeters away from the trunk to prevent bark rot. Wood chips, straw, or well-rotted compost all work well.
6. Prune European plums in late winter or very early spring while the tree is still dormant. Aim for an open center or modified central leader shape that allows sunlight to penetrate the canopy and air to circulate freely, reducing disease pressure.
7. Thin fruit aggressively after the natural June drop, leaving 5 to 8 centimeters between individual plums. This prevents branch breakage, improves fruit size and sweetness, and reduces the tendency toward alternate bearing in subsequent years.
8. Monitor for brown rot, the most common plum disease, by inspecting fruit regularly from mid-summer onward. Remove and destroy any fruit showing circular brown lesions or grey mold, and clear mummified fruit from the tree and ground in autumn.
9. Protect ripening fruit from birds by draping the tree with netting when plums begin to change color. Secure the netting at the base of the trunk to prevent birds from accessing fruit from below.
10. Feed established trees with a balanced organic fertilizer in early spring as buds begin to swell, and apply a potassium-rich feed after harvest to support next season's fruit bud formation and help new wood harden before winter.