How to prune pontederia cordata 'alba'

Deadhead throughout summer; hard cutback in late autumn. Remove spent flower spikes by cutting to their base. In autumn, shear all foliage and stems to 5–10 cm above the crown after frost. Lift and divide overcrowded rootstock every 2–3 years in spring.

Deadhead every few weeks in season; hard cutback annually in autumn. The white-flowered form of pickerelweed is pruned exactly like the species. Deadhead spent white spikes regularly through summer to maintain successive blooms. Cut all growth back to just above the crown or waterline in late autumn once frost has finished the season. Clumps that outgrow their container or pond basket benefit from division in spring.

Remove spent flower spikes by cutting to their base. In autumn, shear all foliage and stems to 5–10 cm above the crown after frost. Lift and divide overcrowded rootstock every 2–3 years in spring.