Aplant for a water depth of 15- cm; beautiful blue .
May be used in smallas well as in large, natural stretches of water. The plants frequently start into growth very early, after which they freeze up and the continue growing in late spring. Thev flower most profusely in full sun, but partial shade is accepted.
Clay or loam is best; alternatively fill containers withsoil and cover with sharp sand.
By division or from.
Pontederia cordata: Height 40-80 cm; bluein thick, erect growing spikes in summer months. The long-stalked are bright green, oblong to heart-shaped. Creeping rhizomes, so that in the course of a few years the plant may spread enormously. In very shallow water Pontederia may be killed by frost in particularly severe winters.