Yes, you can grow galangal in an outdoor plant box, provided you meet its specific growing conditions. Galangal, a tropical rhizome related to ginger, thrives in warm, humid environments with well-draining soil. Here’s how to ensure success:

1. Choose the Right Plant Box: Opt for a deep, spacious container (at least 12-18 inches deep) to accommodate the rhizome’s growth. Ensure it has drainage holes to prevent waterlogging.

2. Soil Requirements: Use rich, loamy soil mixed with compost or organic matter. Galangal prefers slightly acidic to neutral pH (5.5-7.0).

3. Sunlight and Location: Place the plant box in a spot with partial shade to full sun (4-6 hours of sunlight daily). Protect it from strong winds.

4. Watering: Keep the soil consistently moist but not soggy. Water regularly, especially during dry spells, but avoid overwatering to prevent rot.

5. Climate Considerations: Galangal grows best in warm climates (USDA zones 9-11). In cooler regions, consider moving the plant indoors during colder months.

6. Harvesting: Galangal takes 10-12 months to mature. Harvest by gently digging up the rhizomes, leaving some to regrow for future yields.

With proper care, your outdoor plant box can yield a bountiful harvest of this aromatic, flavorful rhizome. Happy gardening!