Why Your Pistachio Tree Has Hollow Nuts: Pollination and Care Essentials

After researching pistachio biology, the expert confirmed that a 10-year-old tree is at the onset of production age (7–10 years). However, the persistent absence of nuts inside shells strongly indicates a missing male pollinator. Pistachio trees are either male or female; females need a male nearby for wind-borne pollen. One male services 8–12 females.

Action Plan

Plant a male pistachio tree if absent. It needn't be large—just mature enough to flower. If a male is already present, the issue may involve pest/disease management or nutrition. Obtain a localized spray and fertilization schedule from your county agricultural extension agent.

Additional Notes

• Peak production occurs around year 20.
• Trees exhibit alternate (biennial) bearing.
• Proper pruning aids harvest.

Expert insight provided by Melissa.