@louannwarren Thank you Lou Ann they do really brighten up the lake side,they do grow wild over here but I don't know if these were planted at this lake:)
@pcoulson@louannwarren@henrir I think the problem is they interfere with NZ native fauna and flora - The rhizomes form dense floating mats, displacing native plants and potentially causing flooding and water level changes in swamps. Poisonous seeds may also affect native birdlife - surprisingly the beautiful blue agapanthus are in the same category!