If you're considering growing a small stewartia in an outdoor plant box, the answer is yes—but with some important considerations. Stewartias are delicate, ornamental trees that thrive in well-drained, slightly acidic soil and prefer partial shade to full sun.

When using a plant box, ensure it’s large enough to accommodate the tree’s root system as it grows. A deep, sturdy container with drainage holes is essential to prevent waterlogging, which can harm the stewartia’s roots. Opt for a high-quality potting mix designed for acid-loving plants to mimic its natural habitat.

Regular watering is crucial, especially during dry spells, but avoid overwatering. Mulching the surface helps retain moisture and regulate soil temperature. Additionally, protect the stewartia from harsh winds, as its branches can be fragile.

With proper care, a small stewartia can flourish in an outdoor plant box, adding elegance to patios, balconies, or small gardens. Just monitor its growth and repot it into a larger container if needed to ensure long-term health.