Creating a dehydrating garden in outdoor plant boxes is an excellent way to conserve water while maintaining a vibrant and sustainable outdoor space. The best plants for this purpose are those that thrive in dry conditions, require minimal watering, and still offer visual appeal. Here are some top choices:

1. Succulents (e.g., Sedum, Echeveria): These plants store water in their leaves, making them perfect for dehydrating gardens. They come in various shapes and colors, adding texture to your plant boxes.

2. Lavender: Known for its fragrant blooms and drought tolerance, lavender is a great addition. It thrives in full sun and well-drained soil, requiring little water once established.

3. Rosemary: This hardy herb is both drought-resistant and useful in the kitchen. Its needle-like leaves and woody stems make it a sturdy choice for plant boxes.

4. Agave: With its striking architectural form, agave is a standout in dehydrating gardens. It’s extremely low-maintenance and can survive long periods without water.

5. Yarrow (Achillea): This perennial produces clusters of tiny flowers and is highly drought-tolerant. It’s also a pollinator magnet, benefiting your garden ecosystem.

6. Russian Sage: Featuring silvery foliage and purple blooms, Russian sage is both drought-resistant and deer-resistant, making it ideal for low-maintenance gardens.

7. Portulaca (Moss Rose): This colorful annual thrives in hot, dry conditions and blooms profusely with minimal care.

By selecting these plants, you can create a beautiful, water-efficient garden in your outdoor plant boxes that requires little upkeep and conserves resources. Pair them with well-draining soil and mulch to further reduce water loss, ensuring your garden remains lush even in dry conditions.