Creating a simplicity garden in outdoor plant boxes is a fantastic way to enjoy greenery without the hassle of high maintenance. The key is to choose plants that thrive with minimal care, adding beauty and tranquility to your space. Here are some of the best options:

1. Succulents: These drought-tolerant plants, like sedum or echeveria, are perfect for sunny spots and require little watering.

2. Herbs: Basil, thyme, and mint are not only easy to grow but also useful in the kitchen. They thrive in well-drained soil and sunlight.

3. Lavender: Known for its fragrance and resilience, lavender loves full sun and needs minimal watering once established.

4. Ferns: Ideal for shaded areas, ferns like Boston or maidenhair add lush greenery with little effort.

5. Marigolds: These bright, cheerful flowers are pest-resistant and bloom prolifically with basic care.

By selecting these low-maintenance plants, you can create a stunning simplicity garden in your outdoor plant boxes, perfect for busy lifestyles or beginner gardeners.