Also known as Black Walnut · Carpathian Walnut · Ceviz
Juglans regia, the Persian walnut, is a large deciduous tree native to a region spanning Central Asia to the Himalayas, prized for its edible nuts and timber.
At-a-glance light, water, soil, and growing conditions from plant data
Full Sun
100% intensity
Requires at least 6-8 hours of direct sunlight daily for optimal growth and fruiting.
Consistent during growth, reduced in late summer
50% intensity
Deep watering at the base, avoid waterlogging
Well-drained, Loam, Sandy loam
50% intensity
Moderate to Warm
50% intensity
Prefers temperate climates with distinct seasons, but can tolerate some heat. Protect from extreme cold during establishment.
Outdoor
50% intensity
Moderate
50% intensity
Balanced fertilizer for young trees; less for mature trees. Soil test recommended.
Safety information from plant toxicity data
| Attribute | Value |
|---|---|
| Toxic for humans | No 0/5 intensity |
| Toxic for pets | No 0/5 intensity |
| Edible | Yes |
The leaves, bark, and fruit husks contain juglone, a chemical that can be toxic to some plants (allelopathy) and animals, particularly horses, causing laminitis. Moldy nuts can also be toxic to dogs.
Key traits and growing stats from plant data
Watering, pruning, propagation, and repotting details from plant data
Persian walnuts require consistent moisture, especially when young and during fruit development. Water deeply at the base of the tree, allowing the soil to dry slightly between waterings.
Reduce watering in late summer to help harden the wood for winter. Avoid waterlogged conditions, which can lead to root rot.
Prune young trees to establish a strong framework, removing crossing or rubbing branches. For mature trees, focus on removing dead, diseased, or damaged wood.
Pruning can also be done to improve light penetration and air circulation within the canopy, which helps prevent fungal diseases.
Persian walnuts are typically propagated by grafting or budding onto rootstocks, often Juglans regia itself or Juglans hindsii.
Seed propagation is possible but often results in trees with variable fruit quality and slower maturity. Grafting ensures desirable traits are passed on.
Repotting is generally not applicable to mature, field-grown Persian walnut trees. Container-grown seedlings or young trees may require repotting every 2-3 years into a larger container to accommodate root growth and prevent girdling.
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Monthly activity intensity for bloom and fruit across both hemispheres.
Flowering & fruiting calendar
Flowering & fruiting calendar
Photos of Persian Walnut (Juglans regia)
Where Persian Walnut (Juglans regia) is found
Density
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7 known issues from plant disease data
Anthracnose on English (Persian) Walnut causes brown leaf spots and blotches, lesions on husks, and early nut drop when infection is severe.
Common names and botanical synonyms
Botanical classification
| Rank | Name |
|---|---|
| Kingdom | Plantae |
| Division | Tracheophyta |
| Class | Magnoliopsida |
| Order | Fagales |
| Family | Juglandaceae |
| Genus | Juglans |
| Species | Juglans regia |
Similar in genus Juglans
Answers based on plant encyclopedia data
