Pontederia cordata also called Pickerel Weed or Heart-leaved Pickerel Weed is part of the Pontederiaceae. A marginal habitat perennial it flowers with small erect spikes of violet-blue tubular flowers in late summer. Once flowers get to seed-stage the stems bend to get submerged.
Pontederia cordata is native to North America and the Caribbean and south all the way to Argentina, it is a wetland plant. It is a deciduous, clump-forming herbaceous perennial that needs full sun. Plant Pontederia cordata in shallow water in rich but poorly-drained soil. You can propagate by seeds or division in spring.