Yes, you can grow a small skimmia in an outdoor plant box, provided you meet its basic growing requirements. Skimmias are compact, evergreen shrubs that thrive in partial shade and well-draining, slightly acidic soil. When planting in a container, ensure the plant box is large enough to accommodate root growth and has drainage holes to prevent waterlogging.

Place the plant box in a sheltered spot with dappled sunlight, as skimmias prefer indirect light. Regular watering is essential, especially during dry spells, but avoid overwatering. Fertilize lightly in spring with an ericaceous feed to maintain soil acidity. With proper care, your skimmia will flourish, offering year-round greenery and seasonal blooms or berries, depending on the variety.