Pistachio

Pistacia vera 'Kerman'

tree

Pistachio (Pistacia vera) is a small, slow-growing desert tree, 20 to 30 ft tall, grown for the green-kernelled nuts in their split tan shells. It is exacting about climate: it needs long, hot, dry summers to fill nuts plus enough winter chill to break dormancy, and it does poorly in cool, humid, or coastal areas. Pistachios are dioecious - male and female flowers grow on separate trees - so a female such as Kerman must have a male such as Peters nearby, with wind carrying the pollen. They bear in about 5 to 7 years and crop heavily only in alternate years.

✅ Plant alongside

Good neighbors that attract beneficial insects or deter pests

• Yarrow: A tough, drought-tolerant companion that draws beneficial insects
• Lavender: Thrives in the same hot, dry, well-drained conditions and feeds pollinators
• Rosemary: A heat- and drought-loving herb that suits the dry orchard floor

🛡️ Pest & disease prevention

Proactive ways to stop trouble before it starts. Tap a name with an arrow for its full guide

• Navel orangeworm →

  The main nut pest; remove old mummy nuts in winter and harvest promptly so larvae cannot build up

• Botryosphaeria blight →

  A fungal blight of shoots and clusters in wetter years; prune for airflow and remove blighted wood and mummies

• Verticillium wilt →

  A soil fungus that wilts branches; plant on resistant rootstock and avoid ground that grew susceptible crops

🌾 Harvest & storage

Pistachios ripen in early fall when the hull loosens and the shell inside has split. Harvest by shaking the nuts onto a tarp, then hull and dry them quickly - within a day of picking - because the staining hull ferments fast if left on. Spread the nuts to dry until the kernels are firm. The familiar split shell happens naturally on the tree as the nut matures; unsplit nuts are simply harder to open.

🥗 Nutrition & benefits

Pistachios are a lean, protein-rich nut with healthy fats, fiber, and the green color of their kernels, eaten roasted and salted, in sweets, and ground into pastes. They are among the lower-fat tree nuts. For a gardener with a genuinely hot, dry climate, a male-and-female pair makes a striking, tough, and productive small orchard tree where little else nut-bearing will thrive.