The garden bed is made from UV-protected PP plastic with a simulated wood design. It is low-maintenance, durable, weather-resistant, and will not rot, crack or peel. You can stack another bed on top of each other to create a-20"- high garden bed as well as connect multiple beds together to make it truly expandable. The plastic sides of this raised garden bed absorb heat to warm soil early in the season, then help retain moisture all summer long, no digging and little weeding are required, just lots of delicious homegrown food. Unlike wood versions, this resin garden won't rot, rust, fade, or disintegrate. If you live in an area with poor soil, raised bed gardening lets you grow healthy vegetables and pretty flowers without ever worrying.