Overwintering guide
How to overwinter black walnut 'thomas'
Winter watering
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
The mistake that kills black walnut 'thomas' in winter
Cutting black walnut 'thomas' 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 black walnut 'thomas' care
- Overwintering black walnut — the species this cultivar belongs to
- Full black walnut 'thomas' care guide
- Black Walnut 'Thomas' temperature range
- How often to water black walnut 'thomas'
- How to prune black walnut 'thomas'
- Common black walnut 'thomas' problems & fixes
- Best plant identifier apps — tested and ranked
Overwintering black walnut 'thomas' — FAQ
Does black walnut 'thomas' need to come indoors for winter?
Black Walnut 'Thomas' is hardy to roughly USDA zone 4 — winter lows around -34°C. That means it can stay outside all winter in most temperate gardens. Black Walnut 'Thomas' 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 black walnut 'thomas' for winter?
Tidy and mulch in late autumn; leave the plant undisturbed until spring.
How often should I water black walnut 'thomas' in winter?
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
What kills black walnut 'thomas' over winter?
Cutting black walnut 'thomas' 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.