Pistachio

Sun

Full sun in an open position; avoid frost pockets and humid, poorly ventilated sites.

Water

Drought-tolerant once established, but crops better with deep irrigation during dry weather; avoid waterlogged soil.

Soil

Deep, well-drained sandy loam or loam; tolerates alkaline soil and some salinity. Drainage matters more than fertility.

Height

20-30 ft (6-9 m)

Spread

20-30 ft (6-9 m)

Flowers

Spring; small, inconspicuous greenish to reddish flowers in separate male and female clusters.

Foliage

Leathery, grey-green compound leaves, usually with three to five broad leaflets; often yellow or orange in autumn.

Growth

Slow to moderate

Care needed

Medium

• Drought tolerant
• Heat tolerant
• Wildlife
• Edible

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Hard

Toughness

Fairly tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   7 ft (2 m)

2. After 1 year

   7 ft (2.2 m)

3. After 2 years

   8 ft (2.4 m)

4. After 3 years

   9 ft (2.6 m)

5. After 5 years

   10 ft (3.1 m)

About 26 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Safe

Growth rate

Slow

• Plant a grafted female and a compatible male whose flowering overlaps; one male can pollinate several nearby females.
• Choose cultivars suited to your local winter chill and summer heat; hardiness alone does not guarantee nuts.
• Water young trees deeply through dry spells, allowing the soil surface to dry between waterings.
• For established cropping trees, irrigate deeply during nut development without keeping the root zone saturated.
• Keep grass away from the trunk and apply organic mulch, leaving the trunk base clear.
• Feed modestly in spring if growth is weak; use soil or leaf testing before adding extra nutrients.

Pruning. In late winter, train young trees to a strong framework of well-spaced branches. Prune established trees lightly to remove dead, crossing or crowded growth, preserving healthy fruiting wood.

Grafted trees commonly take about 5-8 years from planting to give a useful crop, with heavier production later and often alternating heavy and light years. Harvest in late summer or autumn when the outer hull changes colour and separates readily; many ripe shells will have split naturally. Shake or pick nuts onto clean sheets, then remove the hulls and dry the nuts promptly.

Winter

Plant while dormant where the soil is workable and well drained; confirm that male and female flowering times match.

Late winter

Train young trees and remove dead, damaged or crossing branches.

Spring

Check that both sexes flower together; maintain even moisture as growth begins.

Summer

Irrigate deeply during dry spells and check developing nuts for insect damage.

Late summer

Begin checking hull colour and ease of separation; harvest promptly as nuts ripen.

Autumn

Remove leftover nuts from the tree and ground to reduce overwintering pests.

• Use as a productive small shade tree in a sunny edible landscape, allowing space for a pollinating male.
• Plant in a home orchard with other fruit and nut trees suited to hot, dry summers.
• Set in a broad gravel garden with low, drought-tolerant planting outside its immediate watering basin.
• Use its rounded crown and grey-green foliage as a canopy in a spacious Mediterranean-style garden.

Garden styles it suits: Mediterranean, Backyard orchard, Edible landscape, Homestead, Dry gravel garden and Desert / xeriscape.

Plant it with: Lavender, Rosemary, Thyme, Santolina, Pomegranate and Fig.

Wildlife: Wind-pollinated rather than dependent on bees. Birds and squirrels may take the nuts, and the canopy provides shelter and perching sites.

• Few or no nuts: check for a compatible male, overlapping bloom, adequate winter chill and enough summer heat; late frost can also destroy flowers.
• Verticillium wilt: branches wilt or die back, especially on susceptible rootstocks; use locally recommended resistant rootstocks and avoid ground with a history of the disease.
• Root and crown rot: prevent standing water, keep the trunk base uncovered and improve drainage before planting.
• Navel orangeworm in affected parts of the United States: remove all leftover nuts over winter and harvest promptly; seek local guidance if damage persists.

The edible kernels are not known to be inherently toxic to people, cats or dogs, but pistachios can cause serious allergic reactions in susceptible people. Fatty or salted nuts can make pets ill, shells can cause choking or intestinal blockage, and mouldy nuts can contain dangerous toxins. Toxicity of leaves, bark and hulls to cats, dogs and horses is not well established; do not offer them as feed.

• Chinese pistache (Pistacia chinensis)

  Usually has many more, narrower leaflets and clusters of small red fruits that mature blue; it does not produce edible pistachio nuts.

• Mastic tree (Pistacia lentiscus)

  Usually an evergreen shrub or small tree with smaller leaflets and a winged leaf stalk; its small fruits are not commercial pistachios.

Pistacia and pistachio derive through ancient Mediterranean languages from a Persian name for the nut, while vera is Latin for 'true'.

Propagation. Usually budded or grafted onto selected Pistacia rootstocks. Seedlings vary in nut quality, may be male or female and take longer to crop, so use named grafted trees for predictable results.

Accepted botanical name

Pistacia vera

Native range

Afghanistan, Kazakhstan, Kirgizstan, Tadzhikistan, Turkmenistan, Uzbekistan and Iran.

Measured

Soil pH 6.5 to 7. Average height 975 cm.

Sources: GBIF (CC BY 4.0) and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.