Yes, you can grow dwarf galangal plants in an outdoor plant box, provided you meet their specific growing conditions. Dwarf galangal (Alpinia officinarum) is a tropical herb that thrives in warm, humid environments. Here’s how to ensure success:

1. Choose the Right Plant Box: Select a spacious, well-draining container to accommodate the plant’s rhizomatous roots. A depth of at least 12 inches is ideal.

2. Soil Requirements: Use rich, loamy soil with good organic matter. A slightly acidic to neutral pH (6.0–7.0) works best.

3. Sunlight: Place the plant box in a spot with partial shade to full sun (4–6 hours of sunlight daily). In hotter climates, afternoon shade helps prevent leaf scorching.

4. Watering: Keep the soil consistently moist but not waterlogged. Galangal prefers high humidity, so misting can be beneficial in dry climates.

5. Fertilization: Feed with a balanced, slow-release fertilizer every 6–8 weeks during the growing season.

With proper care, dwarf galangal can flourish in an outdoor plant box, adding a unique tropical touch to your garden or balcony. Harvest the rhizomes after 10–12 months for culinary use.