Yes, you can grow dwarf mango plants in an outdoor plant box! Dwarf mango varieties, such as 'Irwin' or 'Cogshall,' are ideal for container gardening due to their compact size. To ensure success, choose a large, sturdy plant box (at least 20-25 gallons) with proper drainage holes. Use well-draining, nutrient-rich soil mixed with compost, and place the box in a sunny spot where the tree can receive 6-8 hours of direct sunlight daily.

Water the mango plant regularly, keeping the soil moist but not soggy. Fertilize every 2-3 months with a balanced fertilizer to promote healthy growth and fruit production. Prune lightly to maintain shape and encourage airflow. In colder climates, move the plant box indoors during winter or provide frost protection.

With the right care, your dwarf mango tree can thrive in an outdoor plant box, yielding sweet, juicy fruit in just a few years. Happy gardening!