Japanese Walnut


General description

Tree to around 15m high. Shoots with glandular hairs, leaves to approx. 60cm long, leaflets 9~17, serrulate with teeth often sparse. Male catkins to around 15cm long, hairy. Female catkins 9~22-flowered, generally hairy with purplish hairs; stigmas 6~7mm long, prominent, pink. Fruit 2.5~4cm long.

Forest, shrubland

Gravity, water dispersed seeds, possibly pigs & possums.

Seedlings in vicinity of parent.

Site management

Stumps will coppice freely without treatment. Work downstream.

Recommended approaches

1. Hand pull small plants. Mulch.
2. Cut and stump paint (5g metsulfuron/1L).
3. Drill & fill 1 hole /150 mm diam (5 g metsulfuron).
4. Spray small plants (5g metsulfuron+10ml penetrant/10L) summer only.

Caution: when using any herbicide or pesticide PLEASE READ THE LABEL THOROUGHLY to ensure that all instructions and safety requirements are followed.

Similar species

tree of heaven
Ailanthus altissima

Tree of heaven is taller, has larger compound leaves which have glands. Leaves have an unpleasant smell when crushed.

rhus tree
Toxicodendron succedaneum

Rhus is a smaller tree, with smaller compound leaves. Its leaves change to brilliant red in autumn before shedding.

Search tags

RPMS status

Not a legally declared pest plant
Japanese walnut - Main species image