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In most areas, Rhoeo is considered an annual, though in fact, it is a tender perennial. Rhoeo is hardy only in USDA plant hardiness zones 9-11. This means that it can only tolerate temperatures down to about 20 F. (-6 C.) before they are killed off. Keep in mind that this is the temperature that will kill them. Caring for Rhoeo Spathacea Tricolor Water the tricolor rhoeo once per week. Water slowly and deeply down through the roots. In the plant s first growth season, it s especially important to maintain a consistent watering schedule to ensure a strong, healthy root system. During the warm months, let the topsoil dry out between waterings, but not the bottom soil.