Overwintering guide
How to overwinter rocky mountain bristlecone pine
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 bristlecone pine in winter
Cutting rocky mountain bristlecone pine 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 bristlecone pine care
Overwintering rocky mountain bristlecone pine — FAQ
Does rocky mountain bristlecone pine need to come indoors for winter?
Rocky Mountain Bristlecone Pine 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 Bristlecone Pine 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 bristlecone pine for winter?
Tidy and mulch in late autumn; leave the plant undisturbed until spring.
How often should I water rocky mountain bristlecone pine in winter?
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
What kills rocky mountain bristlecone pine over winter?
Cutting rocky mountain bristlecone pine 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.