Overwintering guide
How to overwinter zinnia haageana 'old mexico'
Winter watering
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
The mistake that kills zinnia haageana 'old mexico' in winter
Cutting zinnia haageana 'old mexico' 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 zinnia haageana 'old mexico' care
- Overwintering mexican zinnia — the species this cultivar belongs to
- Full zinnia haageana 'old mexico' care guide
- Zinnia haageana 'Old Mexico' temperature range
- How often to water zinnia haageana 'old mexico'
- How to prune zinnia haageana 'old mexico'
- Common zinnia haageana 'old mexico' problems & fixes
- Best plant identifier apps — tested and ranked
Overwintering zinnia haageana 'old mexico' — FAQ
Does zinnia haageana 'old mexico' need to come indoors for winter?
Zinnia haageana 'Old Mexico' is hardy to roughly USDA zone 2 — winter lows around -46°C. That means it can stay outside all winter in most temperate gardens. Zinnia haageana 'Old Mexico' 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 zinnia haageana 'old mexico' for winter?
Tidy and mulch in late autumn; leave the plant undisturbed until spring.
How often should I water zinnia haageana 'old mexico' in winter?
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
What kills zinnia haageana 'old mexico' over winter?
Cutting zinnia haageana 'old mexico' 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.