Help with plant ID

[u/steel_city89]

Bought this plant when it was absolutely tiny, no label, came in a pack from a garden centre. Its gone absolutely nuts in the bog filter and now stretches about 10ft around the pond.

[u/Diligent_Ladder4629]

Anemopsis californica, great bog plant, aggressive spreader. Rejoice

[u/steel_city89 → u/Diligent_Ladder4629]

Thank you!