Overwintering guide

How to overwinter common water hyacinth

Verdict

Outside, protected

When

Mulch and move pots into shelter in late autumn, before the first hard frosts.

Hardiness

Common Water Hyacinth 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.

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 common water hyacinth in winter

Leaving common water hyacinth 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 common water hyacinth care

Overwintering common water hyacinth — the species this cultivar belongs to
Overwintering common water hyacinth — our other guide for the same plant
Full common water hyacinth care guide
Common Water Hyacinth temperature range
How often to water common water hyacinth
How to prune common water hyacinth
Common common water hyacinth problems & fixes
Best plant identifier apps — tested and ranked

Overwintering common water hyacinth — FAQ

Does common water hyacinth need to come indoors for winter?

Common Water Hyacinth 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. Common Water Hyacinth 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 common water hyacinth for winter?

Mulch and move pots into shelter in late autumn, before the first hard frosts.

How often should I water common water hyacinth 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 common water hyacinth over winter?

Leaving common water hyacinth 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.