Water Willow (Justicia tweediana) is a compact evergreen shrub native to Argentina that brings showy purple blooms to summer gardens in zones 8-10. Growing just 2 to 3 feet tall and wide, this low-maintenance plant thrives in full sun with moderate water and actively handles drought once established. Named after 18th-century Scottish horticulturist James Justice and 19th-century gardener John Tweedie (who brought the plant from Argentina to cultivation), it's a piece of horticultural history that still graces modern gardens.
Full Sun
Moderate
8-10
36in H x 36in W
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Moderate
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Water Willow produces vivid purple flowers throughout the summer, starting in July and continuing through August with showy blooms that reward the minimal care it demands. Its compact size and drought tolerance make it exceptionally easy to work with, and it requires no serious pest or disease management, which frees you from the typical struggles of ornamental shrubs. The plant's evergreen foliage stays attractive year-round in warmer zones, and its moderate water needs mean it settles into most gardens without fussy watering schedules.
Water Willow serves as an ornamental shrub, valued for its summer purple flowers and low-maintenance character in warm-climate gardens. Its compact growth and drought tolerance suit it to mixed borders, foundation plantings, and xeriscape designs where visual interest without intensive care is desired.
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“This species carries a distinguished pedigree rooted in 19th-century plant exploration. John Tweedie, a Scottish gardener who emigrated to Argentina, originally encountered Justicia tweediana in South American landscapes, and the specific epithet honors his pioneering work with the plant. The species itself was named in honor of James Justice, an 18th-century Scottish horticulturist (1698-1763), whose contributions to gardening shaped the horticultural community. Woodlanders Nursery of Aiken, South Carolina, introduced the plant into U.S. commerce, bringing this Argentine native from botanical curiosity into American gardens.”