The grids are connected by spirals and do not need to be screwed together. A planting plan is included with the kit. Various climate zones are simulated to create perfect growing conditions for the plants. The three-dimensional spiral shape and the heat-retaining ability of the stones create four zones, ranging from water (A) to moist (B), normal (C), and Mediterranean climate (D). The orientation should be north-south to take full advantage of sunlight. A water zone can be created by establishing a mini pond at the bottom. The spiral can also be used as a stream or as a spiral-shaped flower bed. With pre-formed parts, the herb spiral can be quickly and easily assembled in about 15 minutes (excluding filling and planting). Delivery is as a kit without stones, soil, and plants.