If you have an outdoor plant box with acidic soil, selecting the right plants is crucial for a thriving garden. Acidic soil, with a pH below 7, suits many beautiful and hardy species. Here are some top choices:

1. Azaleas: These vibrant shrubs thrive in acidic soil and add a splash of color with their stunning blooms.

2. Blueberries: Perfect for edible gardening, blueberries love acidic conditions and yield delicious fruits.

3. Hydrangeas: With their large, showy flowers, hydrangeas adapt well to acidic soil, especially blue varieties.

4. Ferns: Shade-loving ferns, like the Japanese painted fern, flourish in acidic, moist environments.

5. Rhododendrons: These evergreen shrubs offer year-round greenery and spectacular spring flowers.

For optimal growth, ensure proper drainage and mulch to retain moisture. Pairing these plants with organic compost can enhance soil health. Whether you're aiming for aesthetics or functionality, these acid-loving plants will transform your outdoor plant box into a lush, vibrant space. Happy gardening!