Yes, you can grow a small nectarine tree in an outdoor plant box, provided you follow the right steps. Dwarf or semi-dwarf nectarine varieties are ideal for container gardening, as they adapt well to limited space. Choose a sturdy, well-draining plant box at least 18-24 inches deep to accommodate the root system.

Use high-quality potting soil mixed with compost to ensure proper nutrients and drainage. Place the plant box in a sunny spot, as nectarine trees require at least 6-8 hours of sunlight daily. Regular watering is crucial, but avoid waterlogging the soil.

Prune the tree annually to maintain its size and encourage fruit production. Fertilize with a balanced formula during the growing season. With proper care, your nectarine tree can thrive and even bear fruit in an outdoor plant box, making it a great option for small gardens or patios.