Overwintering guide
How to overwinter rocky mountain penstemon
Winter watering
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
The mistake that kills rocky mountain penstemon in winter
Cutting rocky mountain penstemon 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 rocky mountain penstemon care
- Overwintering rocky mountain penstemon — the species this cultivar belongs to
- Overwintering rocky mountain penstemon — our other guide for the same plant
- Full rocky mountain penstemon care guide
- Rocky Mountain penstemon temperature range
- How often to water rocky mountain penstemon
- How to prune rocky mountain penstemon
- Common rocky mountain penstemon problems & fixes
- Best plant identifier apps — tested and ranked
Overwintering rocky mountain penstemon — FAQ
Does rocky mountain penstemon need to come indoors for winter?
Rocky Mountain penstemon is hardy to roughly USDA zone 3 — winter lows around -40°C. That means it can stay outside all winter in most temperate gardens. Rocky Mountain penstemon 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 rocky mountain penstemon for winter?
Tidy and mulch in late autumn; leave the plant undisturbed until spring.
How often should I water rocky mountain penstemon in winter?
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
What kills rocky mountain penstemon over winter?
Cutting rocky mountain penstemon 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.