Walnut
Details
Moderately fast growing nut tree producing large edible nuts in a two part shell. Trees excrete jugulone that inhibits plant growth of most other species.
Common name
Walnut, English walnut, Persian Walnut,
Botanical name
Juglans regia
Family
Juglandaceae
Height (m)
20
Forest layer
canopy
Seeds / nuts / tubers
Propagation method
Sow pot / tray
Wind tolerance
Moderate
Shade / Sun
Full sun - part shade
Related
Juglone tolerance
Choosing suitable companion plants for walnuts is difficult because these trees are alleopathic, secreting a substance called juglone that suppresses competing plants. There are very few species that grow well and thrive under the canopy of a walnut tree or in close proximity to its roots. This list details a number of useful species that apparently tolerate walnut juglone.
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Black locust
Common name
Black locust
Botanical name
Robinia pseudoacacia
Details
Fast growing thorny tree with ground durable timber.
All parts of the plant (except the flowers) and especially the bark, should be considered to be toxic. The toxins are destroyed by heat.
All parts of the plant (except the flowers) and especially the bark, should be considered to be toxic. The toxins are destroyed by heat.
Family
Fabaceae or Leguminosae
Flowers
White
Diameter
15.00
Height (m)
25
Forest layer
canopy
Drought tolerance
Jugulone tolerance
Nitrogen fixer
Seeds / nuts / tubers
Shade / Sun
Full sun
Wind tolerance
Moderate
Propagation method
Sow pot / tray
European hazelnut
Botanical name
Corylus avellana
Family
Betulaceae
Details
Broadly columnar, deciduous. Very edible hazel nuts in March with yellow autumn leaves in April. Make great windbreaks yielding nuts, small poles and rods. Coppice readily.
Wind pollinated (not self fertile)
Frost hardy
Wind pollinated (not self fertile)
Frost hardy
Diameter
3.00
Forest layer
low-tree
Height (m)
5
Jugulone tolerance
Seeds / nuts / tubers
Soil type
Most (prefers moist)
Wind tolerance
High
Propagation method
Sow pot / tray