Arranging traditional healing plants in an outdoor plant box requires careful planning to ensure their health and visual harmony. Start by selecting plants with similar sunlight and water needs, such as lavender, chamomile, and mint. Group taller plants like echinacea or yarrow at the back, while placing shorter herbs like thyme or basil near the front for easy access. Leave adequate spacing between plants to prevent overcrowding and promote airflow, reducing the risk of disease. Consider companion planting—for example, pairing rosemary with sage can deter pests naturally. Use well-draining soil and position the box in a spot with at least 6 hours of sunlight daily. Regularly prune and harvest to encourage growth and maintain a tidy appearance. This thoughtful arrangement not only enhances the plants' medicinal properties but also creates a serene, functional garden space.