Arranging ferns in an outdoor plant box can transform your garden into a lush, green oasis. Ferns thrive in shaded or partially shaded areas, making them ideal for plant boxes under porches or trees. Start by selecting a variety of fern species with different textures and heights to create visual interest. Place taller ferns like the Ostrich Fern at the back of the box, while shorter varieties like the Maidenhair Fern can fill the front. Ensure proper drainage by adding a layer of gravel at the bottom and use well-draining soil to keep the roots healthy. Water regularly to maintain moisture, but avoid overwatering to prevent root rot. With these tips, your outdoor plant box will showcase a vibrant, low-maintenance fern display.