If you're considering growing a small oxydendrum (commonly known as a sourwood tree) in an outdoor plant box, the answer is yes—but with some important considerations. Oxydendrum trees thrive in well-drained, acidic soil and prefer partial to full sunlight. When using a plant box, ensure it is large enough to accommodate the tree's root system as it grows. A container with drainage holes is essential to prevent waterlogging, which can harm the roots.

Choose a high-quality potting mix designed for acid-loving plants, and monitor moisture levels closely, especially during hot weather. While oxydendrum can adapt to container life, regular pruning may be needed to manage its size. With proper care, your small oxydendrum can flourish in an outdoor plant box, adding beauty to patios, balconies, or small gardens.