Overwintering guide
How to overwinter nepeta 'six hills giant'
Winter watering
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
The mistake that kills nepeta 'six hills giant' in winter
Cutting nepeta 'six hills giant' 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 nepeta 'six hills giant' care
Overwintering nepeta 'six hills giant' — FAQ
Does nepeta 'six hills giant' need to come indoors for winter?
Nepeta 'Six Hills Giant' is hardy to roughly USDA zone 4 — winter lows around -34°C. That means it can stay outside all winter in most temperate gardens. Nepeta 'Six Hills Giant' 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 nepeta 'six hills giant' for winter?
Tidy and mulch in late autumn; leave the plant undisturbed until spring.
How often should I water nepeta 'six hills giant' in winter?
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
What kills nepeta 'six hills giant' over winter?
Cutting nepeta 'six hills giant' 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.