This kit comes with everything you need except the soil and plants. The insulating open-channel boards trap air, providing insulation to your soil. Keeps soil warmer in the Spring and Fall, and cooler in the Summer, so you can grow for an extended period. Stacking brackets allow you to install the second layer of your garden just by inserting the stakes into the brackets below. Your two-level garden is also fortified by the inclusion of a 4-Way Bracing Bracket and an additional board to brace your garden against frost push-out and keep it perfectly square and true. The patented snap-lock brackets simply slide onto each end of a board and fasten securely with snap-lock buttons. Stacking Brackets pivot 270 degrees, allowing endless design options. Your 4â€™ x 8â€™ x 11â€ two-level raised bed can be converted to two 4â€™ x 8â€™ x 5.5â€ raised beds if that suits your needs more directly. You can also change the shape from a rectangle to a hexagon, either as a two-level bed, or two one level beds (youâ€™ll have 1 board left over). You could also create three 4â€™ x 4â€™ x 5.5â€ square gardens, or four triangle gardensâ€ as you can see the options are endless. You can add on to your modular raised bed any time by purchasing additional 1â€ tool-free kits, boards and anchor or stacking brackets to stack or extend your garden. Curved 1â€ boards are also available to incorporate into your design.