Arranging plant heights in an outdoor plant box is essential for both aesthetics and plant health. The key is to layer plants strategically, placing taller varieties at the back or center and shorter ones toward the edges. This ensures sunlight reaches all plants while creating a visually balanced display.

Start by selecting plants with varying heights—such as tall grasses or shrubs for the background, medium-sized flowers like marigolds or petunias in the middle, and trailing plants like ivy or creeping thyme at the front. Spacing is crucial; overcrowding can stunt growth, so follow planting guidelines for each species.

Consider sunlight exposure and growth habits. Sun-loving taller plants should not shade smaller ones excessively. For round planters, place the tallest plants in the center and radiate outward with shorter varieties. Regularly prune fast-growing species to maintain the arrangement.

By thoughtfully arranging heights, your outdoor plant box will thrive and become a stunning focal point in your garden.