Thalia geniculata 'Red Stem'

Thalia geniculata 'Red Stem', commonly known as Red Stem alligator-flag, is a tall, clump-forming marginal aquatic perennial with broad, paddle-shaped green leaves supported by striking red stems, creating bold architectural interest along pond edges and in wet gardens. In summer it produces slender spikes of small purple flowers above the foliage, adding vertical structure and vibrant contrast to water plantings.

This cultivar thrives in shallow water or consistently moist soil and provides ecological value by attracting pollinators such as bees. Its upright, spreading habit and tolerance of waterlogged conditions make it ideal for pond margins, lakesides, and naturalistic or wildlife-focused planting schemes.