Overwintering guide
How to overwinter japanese walnut
Winter watering
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
The mistake that kills japanese walnut in winter
Cutting japanese walnut hard back in autumn "to tidy up". That removes the growth that shelters the crown, and on some plants removes next season's flower buds entirely.
More japanese walnut care
Overwintering japanese walnut — FAQ
Does japanese walnut need to come indoors for winter?
Japanese Walnut is hardy to roughly USDA zone 4 — winter lows around -34°C. That means it can stay outside all winter in most temperate gardens. Japanese Walnut is properly hardy and overwinters outside without fuss. Tidy away anything dead or diseased, apply a mulch over the crown to steady soil temperatures, and otherwise leave it alone — many hardy plants actually need a cold period to flower and grow well the following year. Save hard pruning for the right season rather than doing it in autumn.
When should I move japanese walnut for winter?
Tidy and mulch in late autumn; leave the plant undisturbed until spring.
How often should I water japanese walnut in winter?
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
What kills japanese walnut over winter?
Cutting japanese walnut hard back in autumn "to tidy up". That removes the growth that shelters the crown, and on some plants removes next season's flower buds entirely.