Juglans regia

English Walnut

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Large deciduous tree prized for timber and edible nuts. Produces juglone, which is toxic to many other plants. Requires deep soil, full sun, and winter chilling.
yard Outdoor plants wb_sunny Sun pets Not pet-safe
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Plant Details

Common Name English Walnut
Family Juglandaceae
Genus Juglans
Species Regia
Origin Central Asia to Balkans
Blooming Spring catkins; nuts mature in autumn
Leaf Color Light green; turning yellow in autumn
Sunlight Sun
Category Outdoor plants
Pet Friendly close No
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Care & Maintenance

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Soil

Deep, well-drained loamy soil rich in organic matter. Avoid waterlogged conditions.

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Watering

Regular watering during establishment; drought tolerant once mature but yields decrease without irrigation.

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Sunlight & Care

Requires full sun exposure for optimal nut production and growth. Minimal shade tolerance.

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Fertilization

Apply balanced fertilizer in early spring after dormancy breaks, avoid high nitrogen late season.

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Pruning

Prune in summer to reduce disease risk and manage structure. Remove water sprouts.

Pest Control Aphid Scale Insect Walnut Caterpillar

These are the insects and pathogens that commonly interact with this plant, including pests, parasites, and organisms typically associated with its care.

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Seasonal Periods

local_florist Flowering Period 2 months
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
agriculture Harvesting Period 2 months
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
eco Leaf Persistence 8 months
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
thermostat

Growing Parameters

thermostat
Temperature
5° – 100°
Fahrenheit
Ideal ambient air temperature range for healthy growth
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Humidity
20% – 75%
% relative
Optimal relative air humidity the plant thrives in
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Light (LUX)
5000 – 100000
Lux
Ambient illuminance level at the plant's surface
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Light (PAR)
1000 – 2500
mmol/m²/s
Photosynthetically active radiation (PAR) intensity
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Soil Moisture
30% – 65%
% volumetric
Water content in the growing medium
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Soil EC
400 – 1800
mS/cm
Electrical conductivity (nutrient concentration in soil water)

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