The design of a private garden flower bed involves creating a visually appealing and functional layout. It typically includes selecting the right shapes for the flower beds, which can be geometric (like circles, squares, or rectangles) or more naturalistic (like curved lines or free-form shapes). The design should consider the garden's size, existing landscape features, and the plants that will be used. Factors such as sunlight exposure, soil type, and water requirements also play a crucial role in the design process.