Powdery Thalia or simply just ‘Thalia' is a tropical aquatic species often used as a showy pond plant in backyard water gardens. Often called ‘powdery alligator flag' or ‘water canna', its name comes from the white powdery coating covering the entire plant and the resemblance of its leaves to those of the canna plant. Due to its exotic look, growing Powdery Thalia in backyard ponds adds a tropical ambiance to water features, as their flower stalks (above the leaves) give rise to a cluster of purplish blue blossoms.

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Source: Gardening Know How