Duncan Grapefruit

Duncan is a classic white-fleshed grapefruit variety grown in Morocco, appreciated for its large
size, juicy pulp, and balanced sweet-acid flavor. Known for its seeded flesh and mild bitterness,
Duncan is mainly used for fresh consumption and processing. Its reliable productivity and good
adaptability make it a staple in Moroccan grapefruit orchards.
Type and Characteristics :
• Scientific name: Citrus × paradisi
• Fruit shape: Round to slightly oblate
• Size : Large
• Peel color: Yellow, moderately thick, smooth
• Flesh: Light yellow, juicy, slightly bitter, aromatic
• Seeds: Many (seeded variety)
• Juice content : High
• Harvest period: January – April
• Use: Fresh consumption, juice production, food industry
Region of Cultivation :
• Souss-Massa (Agadir, Taroudant – main production)
• Gharb (Kenitra, Sidi Slimane)
• Haouz (Marrakech)
• Oriental- Berkane (smaller volumes)
Soil Requirements :
• Prefers deep, well-drained sandy-loam or alluvial soils
• Avoids saline or poorly drained soils
• Optimal pH : 6.0- 7.5
Climate and Growing Conditions :
• Climate: Mediterranean to semi-arid
• Temperature: Optimal 20–32°C; sensitive to frost
• Rainfall: 400–700 mm/year with supplemental irrigation
• Sunlight: Full sun improves sugar content, rind color, and juice quality