How to Grow Merryweather Damson Plum
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Merryweather Damson Plum
Prunus domestica subsp. insititia
treeMerryweather is a self-fertile damson plum variety prized for its dark purple fruit and rich, tart flavor ideal for preserves and cooking. This hardy, reliable tree grows 15-20 feet tall and produces abundant crops with minimal maintenance. It's a classic English cultivar known for excellent disease resistance and consistent productivity.
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Example Merryweather Damson Plum timeline · Pittsburgh, PA (Zone 6b)
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Plant Merryweather Damson Plum
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Merryweather Damson Plum
Late summer into fallBefore the first fall frost (≈ Nov 8)
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Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 4-8, with best performance in zones 5-7
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Get my Merryweather Damson Plum timeline →Growth Stages
Establishment
2-3 yearsYoung tree develops root system and branch framework. Minimal fruiting in first 2-3 years.
Water regularly during establishment. Prune to develop open center framework. Remove flower buds first year to direct energy to growth.
Flowering
2-3 weeksDelicate white or pale pink blossoms appear in early spring (April-May) before leaves fully emerge. Self-fertile but benefits from pollinator activity.
Protect blossoms from late frosts if possible. Light feeding with balanced fertilizer. Do not prune during bloom.
Fruit Development
6-8 weeksSmall green fruits form and grow throughout late spring and early summer. Tree sets generous amounts of fruit.
Thin fruits to 2-3 inches apart for larger individual damsons. Water consistently. Fertilize with potassium-rich feed. Monitor for pests and diseases.
Fruit Ripening
4-6 weeksFruits develop deep purple-blue color with dusty bloom. Interior flesh darkens to yellow-green. Sugar content peaks.
Reduce watering slightly to concentrate flavors. Leave fruit on tree as long as possible for maximum ripeness and sugar. Monitor for wasps and birds.
Harvest
August-SeptemberFruits are fully dark purple, slightly soft to touch, and release easily from branches.
Pick fruits gently, supporting the branch. Harvest when fully ripe for best flavor. Use immediately for cooking or preserve. Prune out dead wood after harvest.
Common Pests
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Spray with spinosad or neem oil at petal fall. Remove and destroy affected fruitlets. Use reflective mulches.
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In US regions, apply insecticidal soap or pyrethrin at petal fall. Shake tree to dislodge beetles into cloth. Remove infested fruits.
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Remove mummified fruits. Improve air circulation by pruning. Do not overhead water. Merryweather has good resistance.
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Spray with strong water jet or insecticidal soap. Encourage natural predators like ladybugs.
Uses
Preserves and Jams
CulinaryMerryweather damsons are the traditional choice for jam, jelly, and cheese due to their naturally high pectin content and excellent set properties. The tart, complex flavor makes superior preserves with authentic damson character. [source]
Cooking and Baking
CulinaryThe firm, tart flesh holds shape well when cooked in pies, crumbles, and stewed preparations. Often used in traditional British compotes and desserts where depth of flavor is desired. [source]
Damson Wine and Liqueurs
CulinaryThe fruit's high acid and sugar content make excellent fermented beverages and homemade liqueurs. Traditional sloe gin-style preparations substitute damsons for superior flavor depth. [source]
Natural Dyes
HouseholdThe deep purple-blue fruit produces strong color compounds that can be used to dye textiles and create natural inks with varying shades depending on mordants used. [source]
Wildlife Support
WildlifeSpring flowers provide early nectar and pollen for bees and pollinators, while ripe fruits feed birds, wasps, and other wildlife. The tree supports ecological diversity in gardens. [source]
Harvest Tips
Harvest in late August through September when fruits are dark purple and slightly yielding to gentle pressure. Pick fruit with stem attached if possible to extend storage life. Damsons taste better after a light frost, which converts starches to sugars. For preserving, pick slightly earlier when fruit is still firm. Fruits will not ripen further after picking, so allow full ripening on tree.
Fun Facts
- 🌱 Merryweather is an English heirloom variety dating to the 1890s, still considered one of the best damson cultivars for traditional preserve-making over 130 years later.
- 🌱 Damsons are genetically distinct from common dessert plums (Prunus domestica) and are classified as subspecies insititia, with origins tracing to Damascus, which inspired the name.
- 🌱 The tree's remarkable self-fertility is unusual for plums—Merryweather reliably produces heavy crops without a pollinator present, though cross-pollination can increase yields.
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