Overwintering guide
How to overwinter dahlia 'hollyhill black beauty'
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 'hollyhill black beauty' in winter
Leaving dahlia 'hollyhill black beauty' 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 'hollyhill black beauty' care
Overwintering dahlia 'hollyhill black beauty' — FAQ
Does dahlia 'hollyhill black beauty' need to come indoors for winter?
Dahlia 'Hollyhill Black Beauty' 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 'Hollyhill Black Beauty' 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 'hollyhill black beauty' for winter?
Mulch and move pots into shelter in late autumn, before the first hard frosts.
How often should I water dahlia 'hollyhill black beauty' 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 'hollyhill black beauty' over winter?
Leaving dahlia 'hollyhill black beauty' 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.