Overwintering guide
How to overwinter dahlia 'bishop of oxford'
Winter watering
Water rarely, and only in dry spells — winter wet is a bigger risk than winter cold. Make sure containers drain freely.
The mistake that kills dahlia 'bishop of oxford' in winter
Leaving dahlia 'bishop of oxford' in a pot standing in a saucer of water. Waterlogged compost freezes solid around the roots and kills plants that would have survived the cold perfectly well.
More dahlia 'bishop of oxford' care
Overwintering dahlia 'bishop of oxford' — FAQ
Does dahlia 'bishop of oxford' need to come indoors for winter?
Dahlia 'Bishop of Oxford' is hardy to roughly USDA zone 8 — winter lows around -12°C. That means it survives outside in mild areas, but wants shelter in a hard winter. Dahlia 'Bishop of Oxford' can stay outside over winter in most areas, but appreciates some protection in a cold snap. Mulch generously over the root zone, move containers against a sheltered wall (pots freeze far harder than open ground), and have horticultural fleece ready for the worst nights. The roots are what you are protecting — top growth can be sacrificed and regrown.
When should I move dahlia 'bishop of oxford' for winter?
Mulch and move pots into shelter in late autumn, before the first hard frosts.
How often should I water dahlia 'bishop of oxford' in winter?
Water rarely, and only in dry spells — winter wet is a bigger risk than winter cold. Make sure containers drain freely.
What kills dahlia 'bishop of oxford' over winter?
Leaving dahlia 'bishop of oxford' in a pot standing in a saucer of water. Waterlogged compost freezes solid around the roots and kills plants that would have survived the cold perfectly well.