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