Yes, you can grow dwarf guava plants in an outdoor plant box! These compact varieties are perfect for container gardening, allowing you to enjoy fresh tropical fruit even in limited spaces. Here’s how to ensure success:

1. Choose the Right Variety: Opt for dwarf guava cultivars like 'Psidium guajava Nana' or 'Ruby Supreme,' which thrive in containers.

2. Select a Spacious Plant Box: Ensure the box is at least 18-24 inches deep with good drainage holes to prevent waterlogging.

3. Use Quality Soil: A well-draining, nutrient-rich potting mix with compost works best for guava plants.

4. Provide Sunlight: Place the plant box in a spot with 6-8 hours of direct sunlight daily for optimal growth.

5. Water and Fertilize Regularly: Keep the soil moist but not soggy, and feed with a balanced fertilizer every 4-6 weeks during the growing season.

6. Prune for Shape and Health: Trim leggy branches to encourage bushier growth and better fruit production.

With proper care, your dwarf guava plant can flourish in an outdoor plant box, yielding sweet, aromatic fruit in just a few years. Happy gardening!