Hibiscus rosa-sinensis 'Alba'
Light: Morning sun with afternoon shade in Phoenix; protect from intense reflected heat and hot, drying winds.
Water: Moderate to high water in Phoenix. Water deeply when the top 1–2 inches of soil dry; maintain even moisture without waterlogging. Containers may need daily watering during extreme heat; reduce watering in winter.
Soil: Well-drained soil enriched with compost; slightly acidic to neutral preferred. Mulch the root zone, keeping mulch away from the trunk.
Mature size: Typically 6–10 feet tall and 4–8 feet wide, depending on cultivar; often smaller in containers or where frost causes dieback.
Bloom: Mainly spring through fall; flowering may slow during extreme summer heat and winter cold. Individual flowers usually last 1–2 days.
Evergreen / deciduous: Evergreen in frost-free conditions; may lose leaves or suffer stem dieback during Phoenix cold snaps.
Growth rate: Moderate to fast with warmth, adequate moisture, and nutrition.