Alpinia zerumbet
Light: Bright filtered shade; gentle early-morning sun is acceptable. Protect from afternoon sun and reflected heat.
Water: Moderate to high water needs in Phoenix. Keep soil consistently moist but not soggy; check frequently during extreme heat. Reduce watering in winter.
Soil: Rich, moisture-retentive, well-drained soil amended with compost. Mulch to cool roots and conserve moisture, keeping mulch away from stem bases.
Mature size: Typically 6–10 feet tall and 4–8 feet wide under favorable conditions; often smaller in Phoenix or containers.
Bloom: Usually late spring through summer on established, second-year stems. Flowering may be limited in Phoenix if frost damages stems or heat stresses the plant.
Evergreen / deciduous: Evergreen in frost-free conditions; foliage and stems may die back after freezing temperatures, with regrowth from protected rhizomes.
Growth rate: Moderate to fast with warmth, consistent moisture, and adequate nutrition; slower under desert stress.