Yes, you can grow cardamom in an outdoor plant box, but it requires specific conditions to thrive. Cardamom (Elettaria cardamomum) is a tropical plant native to India and thrives in warm, humid environments. Here’s how to make it work:

1. Choose the Right Plant Box: Opt for a large, deep container with good drainage to accommodate the plant’s extensive root system.

2. Soil Requirements: Use rich, well-draining soil with organic matter. A mix of compost, peat, and perlite works well.

3. Sunlight & Location: Cardamom prefers partial shade or filtered sunlight. Avoid direct afternoon sun, which can scorch the leaves.

4. Watering & Humidity: Keep the soil consistently moist but not waterlogged. Mist the leaves regularly to mimic tropical humidity.

5. Temperature Control: Cardamom thrives in temperatures between 65–95°F (18–35°C). Protect it from frost or extreme cold.

With proper care, your outdoor plant box can yield fragrant cardamom pods in 2–3 years. Happy gardening!