Creating a dominance garden in outdoor plant boxes requires selecting plants that command attention with their bold presence, texture, and structure. Here are some of the best plants to achieve this effect:

1. Yucca (Yucca gloriosa) – With its sharp, sword-like leaves and towering flower spikes, yucca adds a dramatic architectural element to any garden.

2. Canna Lily (Canna indica) – Known for its large, tropical foliage and vibrant blooms, canna lily creates a lush, dominant look.

3. Japanese Fiber Banana (Musa basjoo) – This fast-growing plant brings a tropical vibe with its massive leaves, making it a standout in any outdoor space.

4. Elephant Ear (Colocasia esculenta) – The huge, heart-shaped leaves of elephant ear plants instantly draw the eye and add a bold texture.

5. Boxwood (Buxus sempervirens) – For a more structured dominance, boxwood hedges or topiaries provide year-round greenery and clean lines.

To enhance dominance, combine tall, upright plants with broad-leafed varieties for contrast. Use dark foliage plants like Black Mondo Grass (Ophiopogon planiscapus 'Nigrescens') or Purple Fountain Grass (Pennisetum setaceum 'Rubrum') to add depth and sophistication.

For low-maintenance dominance, opt for drought-resistant plants like Agave (Agave americana) or Sedum (Sedum spectabile). These require minimal care while still making a strong visual impact.

By carefully selecting and arranging these plants, you can create a dominance garden in outdoor plant boxes that exudes power, elegance, and year-round appeal.