Walnut
Juglans regia · Juglandaceae
📷 Böhringer Friedrich · CC BY-SA 2.5
The gardener's calendar
In autumn, ease off feeding and take the chance to clean up around walnut and prepare for winter.
ID card
- Foliage
- Deciduous
- Flowering
- April to May
- Adult size
- 20 to 25 m tall, broad and rounded crown
- Growth
- Moderate to fast
- Hardiness
- Very hardy, down to -20°C
- Origin
- Central and western Asia
- Soil type
- Deep, fertile and well-drained
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability high.
Expert tips
The key tip
Walnut demands patience: the first 5-8 years are slow, don't worry. Once established (deep roots), it becomes self-sufficient.
The common mistake
Don't prune vigorously or try to 'stimulate' growth: walnut hates wounds and bleeds excessively, attracting diseases and pests.
The pro's trick
At planting, enrich the soil with well-decomposed compost 60 cm deep to help the taproot get established.
Seasonal watch
September-October: fruits fall.
Care
Sunlight
The walnut tree demands full sun exposure to develop harmoniously and produce a beautiful crown. A location sheltered from strong winds is recommended, although it tolerates exposed conditions well. Avoid overly shaded areas which would slow its growth.
Watering
Once established, the walnut is drought-resistant thanks to its deep root system. Young trees (first 2-3 years) should be watered regularly during dry periods. In temperate climates, natural rainfall is generally sufficient.
Soil
The walnut thrives in deep, fertile and well-drained soil. It dislikes compacted soils and waterlogging which promote root rot. Adding organic matter at planting improves establishment and initial development.
Pruning and structure
Pruning is not necessary for a walnut grown as an ornamental or fruit tree. Intervene only to remove dead, diseased or low-hanging branches. Carry out this work in autumn or winter when the tree is dormant.
Fertilising
An established walnut generally doesn't need regular fertiliser. A mulch rich in organic matter at the base of the tree naturally promotes soil fertility. If growth is weak, applying a complete fertiliser in late winter can be beneficial.
Pests and diseases
The walnut is generally robust, but can be affected by anthracnose (a fungal disease) in humid climates. Ensure good air circulation around the tree. Young fruits may be damaged by certain insects, but this rarely compromises the overall health of the tree.
Did you know?
The common walnut was so valued from Antiquity through the Renaissance that it symbolised prosperity and intelligence. The ancient Greeks called it the 'royal acorn' (basilikos karyon), while the walls of medieval houses were often decorated with nutshells, testimony to the prestige of this fruit. A well-maintained walnut can live for several centuries and produce nuts for 100-150 years.
Where to buy it
Best planted in autumn so the roots settle in before summer, or in early spring once the frost has passed. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, October, November.
Add this plant to my garden →Plants from the same family
- Black walnutJuglans nigra
- PecanCarya illinoinensis
- Manchurian walnutJuglans mandshurica
- Shellbark hickoryCarya laciniosa
- Shagbark hickoryCarya ovata
- ButternutJuglans cinerea
Tips generated and checked by Viridia — adapt them to your local climate.