Overwintering guide
How to overwinter salvinia natans
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 salvinia natans in winter
Bringing salvinia natans 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 salvinia natans care
Overwintering salvinia natans — FAQ
Does salvinia natans need to come indoors for winter?
Salvinia natans is hardy to roughly USDA zone 9 — winter lows around -7°C. That means it takes cool conditions but not a real freeze. Salvinia natans 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 salvinia natans for winter?
Move under cover before the first hard frost; back outside after the last spring frost.
How often should I water salvinia natans in winter?
Water only occasionally — enough that the rootball never dries out completely, no more. No feeding until spring growth begins.
What kills salvinia natans over winter?
Bringing salvinia natans 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.