How to Grow Greengage Plum 'Jefferson'
Wikimedia Commons
Greengage Plum 'Jefferson'
Prunus italica 'Jefferson'
treeJefferson Greengage is a mid-season dessert plum variety prized for its sweet, honey-flavored golden-green flesh and superior flavor. This deciduous fruit tree produces medium-sized fruits with excellent quality for fresh eating and preserving. It's a reliable producer with good disease resistance and requires a pollinator for optimal fruit set.
When should you plant Greengage Plum 'Jefferson' in your zone?
Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.
Example Greengage Plum 'Jefferson' timeline · Pittsburgh, PA (Zone 6b)
-
Plant Greengage Plum 'Jefferson'
Around Apr 17Near Pittsburgh's average last spring frost.
-
Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
-
Harvest Greengage Plum 'Jefferson'
Late summer into fallBefore the first fall frost (≈ Nov 8)
Sample dates for Pittsburgh, PA. Sign up to get exact Greengage Plum 'Jefferson' dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 5-7; can succeed in zone 4b with winter protection
Sign up free to see if Greengage Plum 'Jefferson' grows in your zone — and get a personalized planting timeline.
Get my Greengage Plum 'Jefferson' timeline →Growth Stages
Establishment (Year 1)
12 monthsYoung tree focuses on root development and establishing framework branches; minimal flowering
Stake and support; remove any flower buds to redirect energy to root establishment; water regularly; apply 2-3 inches of mulch around base; prune to develop strong scaffold branches
Juvenile Growth (Years 2-3)
24 monthsTree develops lateral branches; some flowers may appear but fruit is removed to establish tree structure
Continue light pruning to open canopy; remove flowers and small fruit to redirect energy; maintain consistent moisture; apply balanced fertilizer in spring
Flowering (Spring, April-May)
2-3 weeksTree produces fragrant white to pale pink blossoms in clusters; blooms appear before or with emerging leaves
Ensure compatible pollinator variety is nearby (Reine Claude or Transparent Gage recommended); protect flowers from late frost by avoiding planting in frost pockets; do not prune during flowering
Fruit Development (Summer, June-July)
8-10 weeksSmall green fruits develop from pollinated flowers; fruit gradually enlarges and develops characteristic golden-green color with slight blushing
Thin fruits to 4-6 inches apart when marble-sized to ensure larger fruit; water consistently and deeply; feed with low-nitrogen fertilizer; protect from pests and birds
Maturation & Harvest (Late July-August)
3-4 weeksFruits reach full size and sweetness; skin develops golden-amber hue with slight rosy flush; fruit yields slightly to gentle pressure when ripe
Harvest when fully ripe and fragrant for best flavor; pick gradually as fruit ripens; handle carefully to avoid bruising; can leave ripe fruit on tree for 1-2 weeks if needed
Common Pests
-
Apply kaolin clay spray during fruit development; hand-pick affected fruit; place sticky traps; use pyrethrin-based insecticides if heavy infestation; thin fruit to reduce pest habitat
-
Handpick beetles early morning; use pheromone traps away from tree; apply neem oil or spinosad; encourage native parasitic wasps
-
Remove fallen fruit and damaged fruit from tree; apply spinosad when petals fall; practice sanitation to eliminate larval overwintering sites
-
Prune out infected branches 6-12 inches below visible knots; sterilize pruning tools between cuts; do not compost infected material; ensure good air circulation
-
Remove mummified fruit from tree and ground; thin fruit for air circulation; prune out infected twigs; apply sulfur or copper fungicide during wet springs
Uses
Fresh Eating & Desserts
CulinaryJefferson Greengage is renowned for its exceptional dessert quality with honey-sweet flavor and tender flesh. Ideal for fresh eating out of hand, fruit salads, and elegant desserts. [source]
Preserves & Jam Making
CulinaryClassic choice for making greengage jam, preserves, and compotes due to high pectin content and distinctive flavor. The bright golden color and refined taste make exceptional preserve. [source]
Cooking & Baking
CulinaryUse in tarts, pies, clafoutis, and poached preparations. The firm flesh holds well in cooked applications and the subtle flavor complements vanilla, almond, and cardamom. [source]
Digestive & Nutritional Benefits
MedicinalGreengages are rich in fiber, antioxidants, and vitamins A and C. Historically used to support digestive health and provide nutritional benefits. [source]
Pollinator Support
WildlifeAbundant spring flowers provide nectar and pollen for bees, supporting early-season pollinator populations. A valuable resource for local bee colonies. [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 late July to mid-August when fruits are fully ripe and fragrant, indicated by slight give when gently squeezed and golden-amber color. Gently twist or clip with pruners to avoid tearing. Ripe fruit can be left on tree 1-2 weeks if needed. Peak ripeness occurs 2-3 days after color develops. For preserve-making, pick slightly earlier; for fresh eating, harvest when fully soft and sweet.
Fun Facts
- 🌱 Greengage plums are named after Sir William Gage, an 18th-century English botanist who introduced the variety to England from France, where it was originally called 'Reine Claude' after the French queen.
- 🌱 Jefferson Greengage is one of the few plum varieties that actually improves in flavor after ripening off the tree, similar to avocados, making it an excellent market and shipping variety.
- 🌱 The distinctive golden-green color is what gave greengages their common name; 'gage' likely derives from the French 'Reine Claude' becoming 'Reine Gage' and eventually simplified to just 'Greengage'.
Join 30,000 gardeners planning their gardens with LizPlants.
Get your personalized Greengage Plum 'Jefferson' planting timeline
Tell us your zip code and we'll calculate exactly when to start Greengage Plum 'Jefferson' seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.
Get my Greengage Plum 'Jefferson' timeline →