How to Grow French Prune
Wikimedia Commons
French Prune
Prunus domestica 'French'
fruitFrench Prune is a medium-sized deciduous fruit tree producing large, dark purple plums with sweet, dense flesh ideal for fresh eating and drying. Known for exceptional sugar content and rich flavor, it's the primary variety used in commercial prune production, particularly in California. The tree is vigorous, productive, and relatively disease-resistant.
When should you plant French Prune in your zone?
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Example French Prune timeline · Pittsburgh, PA (Zone 6b)
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Plant French Prune
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 French Prune
Late summer into fallBefore the first fall frost (≈ Nov 8)
Sample dates for Pittsburgh, PA. Sign up to get exact French Prune dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Zones 5b-9b; best fruit production in zones 7-9 with adequate winter chill
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Get my French Prune timeline →Growth Stages
Establishment (Year 1)
12 monthsYoung tree with initial branch framework development; minimal flowering; focus on root system and structure
Water regularly; stake for support; prune to establish open center or vase shape; remove any early flowers to encourage tree growth
Juvenile Growth (Years 2-3)
24 monthsTree increases in size; some flowering begins but minimal fruit set; canopy fills in
Continue structural pruning; maintain consistent watering; thin excessive flowers to prevent stress; apply balanced fertilizer in spring
Flowering & Fruit Set (Spring, Years 3+)
4-6 weeksAbundant white flowers appear in early spring before leaf emergence; bees pollinate; small green fruit develops
Ensure pollinator access; thin fruit to 2-3 inches apart when marble-sized for larger fruit; avoid spring frost damage with frost cloth if needed
Fruit Development & Ripening (Summer, June-August)
8-12 weeksFruit grows rapidly and darkens from green to purple-black; sugar content increases; flesh softens
Maintain consistent deep watering; apply balanced or potassium-rich fertilizer in June; monitor for pests and diseases; provide light afternoon shade in extremely hot climates
Harvest & Dormancy (Late Summer-Winter)
5-6 monthsPlums reach full ripeness and color; harvest occurs; tree gradually loses leaves and enters dormancy
Harvest when fully ripe; prune in late winter during dormancy; reduce watering in fall; apply dormant oil spray for pest control
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Remove fallen fruit daily; apply spinosad or pyrethrin; use trunk bands or sticky traps; prune dense growth for air circulation
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Bag individual fruit with paper bags; remove infested fruit immediately; use protein-based traps; maintain sanitation
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Prune out infected branches 12 inches below knot; apply copper fungicide in spring; improve air circulation
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Remove mummified fruit; thin branches for air flow; apply sulfur fungicide during wet spring weather; avoid overhead watering
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and
Apply dormant oil spray in late winter; use insecticidal soap during growing season; encourage beneficial insects
Uses
Fresh eating and desserts
CulinaryFrench Prunes are exceptional fresh fruits with high sugar content and rich flavor, perfect for eating out of hand, in fruit salads, or in desserts. Their dense, sweet flesh makes them superior for fresh consumption compared to many other plum varieties. [source]
Dried prunes and preserves
CulinaryThis variety is the primary cultivar used commercially for dried prunes due to exceptional drying quality and natural sugar concentration. They can be dried whole or processed into jams, compotes, and preserves. [source]
Digestive health
MedicinalPrunes are renowned for their natural laxative properties due to sorbitol and high fiber content, supporting digestive health and regular bowel function. Traditionally used in natural remedies for constipation. [source]
Natural sweetener and ingredient
HouseholdDried French Prunes or prune juice can substitute for refined sugar in baking and cooking, providing natural sweetness with added nutritional benefits. Prune paste extends shelf life in baked goods. [source]
Pollinator and wildlife support
WildlifeThe fragrant spring blossoms attract bees and other pollinators essential for fruit production. Mature trees provide shelter and food sources for birds and beneficial insects. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Harvest in mid-to-late August when fully dark purple and slightly soft to gentle pressure. Plums do not ripen significantly after picking, so allow full ripeness on tree. For fresh eating, harvest when deeply colored and fragrant. For drying/prune production, wait until fruit reaches maximum sugar content. Harvest by hand, twisting gently. Store fresh plums at room temperature for 2-3 days or refrigerate up to 2 weeks.
Fun Facts
- 🌱 French Prunes account for approximately 99% of commercial dried prunes produced in California, making them the most economically important plum variety in North America.
- 🌱 A mature French Prune tree can produce 40-50 pounds of fruit in a season, and dried prunes retain 70% of the fresh fruit weight, meaning one tree can yield 28-35 pounds of prunes annually.
- 🌱 The name 'French Prune' is somewhat of a misnomer—the variety likely originated in the Agen region of southwestern France centuries ago, but its commercial success came through 19th-century cultivation in California.
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