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Plant · P-536
Arizona Walnut
Juglans major
Arizona Walnut is a fast-growing, drought-hardy tree of dry southwestern stream banks and canyons, producing small, hard-shelled nuts that reward hand cracking with a good kernel. Its thick husk and extremely tough shell make it slow going compared with other walnuts, but it earns its keep as rootstock - Persian and Carpathian walnut grafted onto it thrives on alkaline soils where other walnut rootstocks fail. Its wide, round crown casts useful shade, though the roots and fallen leaves carry juglone, which suppresses sensitive neighbours such as apples.
Record at a glance
Growing profile
- Sun
- Full Sun · Partial Sun
- USDA zone
- USDA 7–9
- Soil
- Sand · Loam
- Moisture
- Dry · Moderate
Vertical layer
Canopy- Soil pH
- 6–8
- Plant type
- Deciduous Tree
- Mature height
- 36–48 ft
- Mature spread
- 30–50 ft
- Plant spacing
- 30–40 ft
- Root type
- Tap
- Spread pattern
- Seed
Keep exploring
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The deeper layer
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- Primary
- Locked ecological function
- Secondary
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- Byproduct
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