Creating an expandable outdoor plant box system is a fantastic way to enhance your gardening space while keeping it flexible for future growth. Here’s a step-by-step guide to help you build your own modular plant box system.

Materials Needed:

- Pressure-treated lumber or cedar planks (for durability)

- Screws and waterproof wood glue

- Drill and saw

- Measuring tape and level

- Landscape fabric (optional for drainage)

Step 1: Design Your Modular System

Plan the dimensions of your plant boxes, ensuring they can interlock or connect easily. A standard size is 2x4 feet, but customize based on your space.

Step 2: Cut and Assemble the Boxes

Cut the lumber to size and assemble the frames using screws and wood glue. Reinforce the corners for stability.

Step 3: Add Drainage and Expandability

Drill drainage holes in the bottom. For expandability, design side panels with removable connectors or slots to attach additional boxes later.

Step 4: Install Landscape Fabric (Optional)

Line the inside with landscape fabric to prevent soil leakage while allowing drainage.

Step 5: Arrange and Fill

Place your boxes in the desired layout, connect them if needed, and fill with soil. Plant your favorite herbs, flowers, or vegetables!

This expandable system lets you grow your garden as your needs change, making it perfect for both beginners and seasoned gardeners. Happy planting!