Creating a vibrant yuja garden in outdoor plant boxes requires selecting the right plants that thrive in confined spaces while complementing the citrusy charm of yuja (also known as yuzu). Here are the best plants to consider:

1. Yuja (Yuzu) Trees: The star of the garden, yuja trees are hardy citrus plants that flourish in containers. Ensure well-draining soil and ample sunlight for optimal growth.

2. Herbs (Mint, Basil, Thyme): These aromatic herbs pair well with yuja, enhancing culinary uses and repelling pests naturally.

3. Lavender: Adds a soothing fragrance and attracts pollinators, creating a balanced ecosystem in your garden.

4. Dwarf Citrus Varieties (Calamondin, Meyer Lemon): Compact citrus plants thrive alongside yuja, offering diversity and year-round interest.

5. Ornamental Grasses (Blue Fescue, Japanese Forest Grass): Provide texture and contrast, softening the look of plant boxes.

For success, use high-quality potting mix, ensure proper drainage, and water consistently. With these plants, your yuja garden will be a lush, fragrant oasis in any outdoor space.