Overwintering guide
How to overwinter giant mondo grass
Winter watering
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
The mistake that kills giant mondo grass in winter
Cutting giant mondo grass 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 giant mondo grass care
Overwintering giant mondo grass — FAQ
Does giant mondo grass need to come indoors for winter?
Giant Mondo Grass is hardy to roughly USDA zone 7 — winter lows around -18°C. That means it can stay outside all winter in most temperate gardens. Giant Mondo Grass 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 giant mondo grass for winter?
Tidy and mulch in late autumn; leave the plant undisturbed until spring.
How often should I water giant mondo grass in winter?
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
What kills giant mondo grass over winter?
Cutting giant mondo grass 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.