Roundleaf Chastetree is a low, sprawling woody shrub native to sandy coastal regions across Japan, eastern Asia, Southeast Asia, and the Pacific islands. Growing just 1 to 2 feet tall but spreading 10 to 15 feet or more, this hardy species thrives in Zones 7 through 10 and produces showy flowers in May alongside ornamental fruit. Its exceptional tolerance for salt, wind, and drought makes it a striking choice for challenging coastal and sandy soils where most plants struggle.
Full Sun
Moderate
7-10
24in H x 180in W
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Moderate
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This prostrate-sprawling shrub spreads aggressively across sandy ground through runners that root at the nodes and floating seeds, a trait that demands careful placement in the garden but creates dramatic natural groundcover effects. Its native habitat spans some of the world's harshest coastal environments, from rocky shorelines to sand dunes, giving it an almost indestructible constitution. In the right location, inland gardens where it won't threaten native ecosystems, it becomes a low-maintenance spreader with genuine ornamental presence.
Roundleaf Chastetree excels as a ground cover, spreading across sandy or rocky terrain where conventional ornamentals fail. Its low, prostrate growth and ability to naturalize in harsh coastal conditions make it valuable for stabilizing sandy slopes and erosion-prone shorelines, though gardeners must consider its invasive potential in sensitive coastal ecosystems.
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“Roundleaf Chastetree evolved in the sandy, nutrient-poor coastal ecosystems of Japan, eastern Asia, Southeast Asia, India, and Pacific island shorelines, where it developed its remarkable tolerance for salt spray, wind, and infertile soils. Its ability to spread by rooting runners and floating seeds reflects millions of years of adaptation to coastal dispersal, though this same trait has raised conservation concerns in some North American coastal regions where it now spreads aggressively and is no longer recommended for planting.”