Creating a proportion garden in outdoor plant boxes is an excellent way to maximize space while maintaining aesthetic balance. The key is selecting plants that complement each other in size, texture, and growth habits. Here are some of the best plants to achieve a harmonious proportion garden:

1. Dwarf Shrubs: Compact varieties like boxwood or dwarf hydrangeas provide structure without overwhelming the space.

2. Ornamental Grasses: Feather reed grass or blue fescue add movement and softness, balancing taller plants.

3. Trailing Plants: Ivy, creeping thyme, or sweet potato vine spill over edges, creating a lush, layered look.

4. Flowering Annuals: Petunias, marigolds, or pansies offer seasonal color and fill gaps between larger plants.

5. Herbs: Rosemary, basil, or thyme are practical and visually appealing, with varied textures and heights.

For optimal results, arrange plants by height—tallest in the center or back, medium in the middle, and trailing varieties at the edges. Ensure proper drainage and sunlight for each plant’s needs. With thoughtful selection, your outdoor plant boxes can become a stunning, proportional garden masterpiece.