wapato

This plant is listed on Schedule 9 of the UK Wildlife & Countryside Act as an invasive non-native species. While this does not prevent it from being sold in the UK, or from being grown in gardens, the RHS encourages those that do grow it to take great care with managing it and with disposing of unwanted material. The RHS also encourages gardeners to find alternative plants to grow to those listed on Schedule 9. For suggested alternative plants see the Plantlife/RHS guide: Gardening without harmful invasive plants

Cut back in late summer and remove dead flowerheads to prevent self-seeding

Propagate by seed or by runners in summer. Alternatively, plant overwintered tubers in spring

Leaves may be damaged by water lily aphids

Generally disease free