Overwintering guide
How to overwinter vallisneria gigantea
Winter watering
Water only occasionally — enough that the rootball never dries out completely, no more. No feeding until spring growth begins.
The mistake that kills vallisneria gigantea in winter
Bringing vallisneria gigantea into a warm living room. Too much winter warmth forces weak, pale growth that collapses when it goes back outside — cool and bright beats warm and dim.
More vallisneria gigantea care
Overwintering vallisneria gigantea — FAQ
Does vallisneria gigantea need to come indoors for winter?
Vallisneria gigantea is hardy to roughly USDA zone 9 — winter lows around -7°C. That means it takes cool conditions but not a real freeze. Vallisneria gigantea will take cool conditions but not a hard freeze, so the aim is a frost-free winter rather than a warm one. An unheated greenhouse, porch, conservatory or bright garage all work well. Keep it cool, bright and on the dry side, and it will hold steady until growth restarts in spring.
When should I move vallisneria gigantea for winter?
Move under cover before the first hard frost; back outside after the last spring frost.
How often should I water vallisneria gigantea in winter?
Water only occasionally — enough that the rootball never dries out completely, no more. No feeding until spring growth begins.
What kills vallisneria gigantea over winter?
Bringing vallisneria gigantea into a warm living room. Too much winter warmth forces weak, pale growth that collapses when it goes back outside — cool and bright beats warm and dim.