What is a common tool used in landscape design planning?

Landscape diagrams and sketches are vital tools in landscape design planning because they serve as a visual representation of the proposed design. These diagrams help both the designer and the client visualize how different elements—such as plants, pathways, hardscape, and water features—will fit together in the space. They allow for the exploration of spatial relationships and help in assessing how the design will interact with existing site features and topography.

Using diagrams and sketches also facilitates communication with other professionals, stakeholders, and clients. It can outline dimensions, proportions, and materials, making it easier to discuss ideas, make adjustments, and ensure that all parties are aligned on the vision for the project. Additionally, these visual tools are essential for presentations and can help in securing approvals from regulatory agencies when necessary.

While the other options are important aspects of landscape architecture, they do not serve as primary tools for creating and planning design layouts. Client testimonials can provide insight into the designer's past work, regulatory compliance checklists ensure that designs meet legal requirements, and market pricing analysis helps in budgeting and financial planning; however, none of these directly contribute to the initial artistic and spatial planning process like diagrams and sketches do.