Arranging biennials in an outdoor plant box requires careful planning to ensure healthy growth and aesthetic appeal. Biennials, which complete their life cycle over two years, thrive when given proper spacing, sunlight, and soil conditions. Here’s how to arrange them effectively:

1. Choose the Right Biennials: Select varieties like foxgloves, hollyhocks, or sweet William that suit your climate and box size.

2. Spacing Matters: Leave 6-12 inches between plants to prevent overcrowding and allow for root expansion.

3. Layer by Height: Place taller biennials (e.g., hollyhocks) at the back and shorter ones (e.g., forget-me-nots) near the front for a tiered effect.

4. Sunlight and Soil: Ensure the plant box receives at least 6 hours of sunlight daily and use well-draining soil enriched with compost.

5. Watering and Maintenance: Water deeply but infrequently, and mulch to retain moisture. Remove spent blooms to encourage growth.

By following these steps, your biennials will flourish, creating a vibrant and structured outdoor display.