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
Family Fabaceae or Leguminosae
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.
Flowers White
Diameter 15.00
Forest layer canopy
Height (m) 25
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
Height (m) 5
Forest layer low-tree
Jugulone tolerance
Seeds / nuts / tubers
Soil type Most (prefers moist)
Wind tolerance High
Propagation method Sow pot / tray