Habit: Impressive large tree, (18) 20-25 m tall; 8-10 m wide, broadly spreading crown, horizontally extended branches; unevenly rounded, multi-stemmed, fast-growing.
Flowers: Monoecious, inconspicuous, male flowers yellow-green, cylindrical catkins, 8-10 cm, female flowers rotund; April to May.
Fruits: Rotund to slightly ovoid nuts in clusters, 3-7.5 cm long, slightly smaller than J. regia, yellow-green, thick and rough husk, glandular hair, edible, August to October.
Leaves: Deciduous, extremely large, 40-90 cm, odd pinnate, densely pilose beneath, serrate margins, lushly yellow autumn colour. Called ‘palm of the north’ due to its remarkably large leaves.
Bark: Light grey, deeply cracked.
Demands: Sun, exceptionally hardy, does not tolerate salt.
Soil: Fresh, nutritious, evenly moist, alkaline.
Hardiness: Zone 5
Note: Pruning in late summer if necessary. In general pruning should be avoided.