The design of a one-story duplex garden involves creating a cohesive and functional space that can accommodate multiple levels of living within a single garden area. This typically includes considerations for different living areas, outdoor entertainment spaces, and sufficient greenery. Key elements in such a design might include tiered garden beds, vertical gardens, outdoor kitchens or BBQ areas, and integration of different types of plants for privacy and aesthetics. Additionally, the design must account for proper drainage, lighting, and accessibility for all users.