Arranging ornamental grasses in an outdoor plant box can transform your garden into a visually appealing oasis. The key lies in balancing height, texture, and color for a harmonious look. Start by selecting a mix of tall, medium, and short grasses to create layers. Tall varieties like Miscanthus or Pennisetum work well as backdrops, while mid-height grasses such as Festuca or Carex add depth. Low-growing options like Blue Fescue can fill in gaps.

Consider the growth habits and sunlight requirements of each grass to ensure they thrive together. Group grasses with similar water needs to simplify maintenance. For a dynamic effect, mix grasses with different leaf shapes—fine, broad, or arching—to add texture. Seasonal color changes can also enhance visual interest; for example, combine evergreen grasses with those that turn golden in autumn.

Place the plant box in a spot where the grasses can sway naturally in the breeze, adding movement to your garden. Regular pruning and dividing will keep them healthy and prevent overcrowding. With thoughtful arrangement, ornamental grasses can elevate your outdoor space effortlessly.