Overwintering guide
How to overwinter sea spleenwort
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 sea spleenwort in winter
Leaving sea spleenwort 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 sea spleenwort care
Overwintering sea spleenwort — FAQ
Does sea spleenwort need to come indoors for winter?
Sea Spleenwort 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. Sea Spleenwort 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 sea spleenwort for winter?
Mulch and move pots into shelter in late autumn, before the first hard frosts.
How often should I water sea spleenwort 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 sea spleenwort over winter?
Leaving sea spleenwort 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.