Creating a complexity garden in outdoor plant boxes is a fantastic way to maximize space and add visual interest to your urban or small-scale gardening setup. The key is selecting plants that thrive in containers while offering varied textures, heights, and colors. Here are some top choices:

1. Herbs (Basil, Thyme, Rosemary): Compact and aromatic, herbs add layers of fragrance and practicality.

2. Dwarf Shrubs (Boxwood, Dwarf Hydrangea): These provide structure and year-round appeal.

3. Trailing Plants (Ivy, Sweet Potato Vine): Perfect for cascading over edges, adding movement.

4. Ornamental Grasses (Fountain Grass, Blue Fescue): Introduce texture and a wild, natural feel.

5. Colorful Annuals (Petunias, Marigolds): Bright blooms ensure seasonal vibrancy.

Pairing these plants creates a dynamic, low-maintenance complexity garden. Ensure proper drainage and sunlight for optimal growth. Happy gardening!