Overwintering guide
How to overwinter spottted horsemint
Winter watering
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
The mistake that kills spottted horsemint in winter
Cutting spottted horsemint 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 spottted horsemint care
Overwintering spottted horsemint — FAQ
Does spottted horsemint need to come indoors for winter?
Spottted Horsemint is hardy to roughly USDA zone 3 — winter lows around -40°C. That means it can stay outside all winter in most temperate gardens. Spottted Horsemint 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 spottted horsemint for winter?
Tidy and mulch in late autumn; leave the plant undisturbed until spring.
How often should I water spottted horsemint in winter?
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
What kills spottted horsemint over winter?
Cutting spottted horsemint 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.