Creating a butterfly garden in an outdoor plant box is not only possible but also a fantastic way to support pollinators in small spaces. To succeed, choose a spacious, well-draining container and fill it with nutrient-rich soil. Select butterfly-friendly plants like milkweed, lavender, coneflowers, and zinnias, which provide nectar and host larvae. Place the box in a sunny location, as butterflies thrive in warmth. Regular watering and avoiding pesticides will ensure a healthy habitat. With careful planning, your outdoor plant box can become a vibrant sanctuary for butterflies, adding beauty and ecological value to your garden.