How to Grow Greengage Plum (Old Green Gage)

Tree is leafless with brown twigs. Root system visible and ready for planting.

Plant in early spring (late February to April) or fall (October-November) in cool climates. Soak roots in water for 2-3 hours before planting. Prune any damaged roots. Backfill with compost-amended soil.

Pink flower buds swell, pale green leaves begin unfurling. Trees may flower lightly first year.

Remove all first-year flowers to encourage root establishment. Water moderately; apply 2-3 inches of mulch around base (keep 6 inches from trunk). Monitor for pests. Stake if needed for wind protection.

Delicate white to pale pink flowers cluster on two-year-old and older wood. Flowers are fragrant and attractive to pollinators.

Avoid pruning during bloom. Ensure pollinator access; Greengages are partially self-fertile but produce better with cross-pollination from other plum varieties (Damson, Stanley, or Italian Prune work well). Protect from late frosts which can damage flowers.

Small green fruit forms after flower drop. Fruit enlarges gradually, remaining pale green with light freckling. Fruit hangs heavy on branches by midsummer.

Thin fruit to one every 2-3 inches when walnut-sized to promote larger fruit and reduce branch breakage. Water consistently (1-2 inches weekly) to prevent fruit cracking. Apply balanced fertilizer in early June. Watch for common pests and diseases.

Fruit softens, develops full sweet aromatic flavor. Skin remains green to greenish-gold. Peak ripeness indicated by gentle give when gently squeezed.

Harvest only fully ripe fruit (late July to August depending on zone). Fruit does not ripen significantly after picking. Pick into cushioned containers to avoid bruising. Some fruit will drop when fully ripe; place tarps to catch for jam or cooking. Support heavy branches with props if needed.