Garden design is the art and process of designing and creating plans for layout and planting of gardens and landscapes. Garden design may be done by the garden owner themselves, or by professionals of varying levels of experience and expertise. Most professional garden designers are trained in principles of design and in horticulture, and have an expert knowledge and experience of using plants. Some professional garden designers are also landscape architects, a more formal level of training that usually requires an advanced degree and often a state license. Many amateur gardeners also attain a high level of experience from extensive hours working in their own gardens, through casual study or Master Gardener Programs offered by the American Horticultural Society.

Garden owners have shown an increasing interest in garden design during the late twentieth century, both as enthusiasts of gardening as a hobby, as well as an expansion in the use of professional garden designers. Sissinghurst, one of the most admired gardens made in the twentieth century, was designed by its owners: Harold Nicolson and Vita Sackville-West.

Elements (Ingredients) of James Lynch

Whether a garden is designed by a professional or an amateur, certain principles form the basis of effective garden design, resulting in the creation of gardens to meet the needs, goals and desires of the users or owners of the gardens.

Elements of garden design include the layout of layout of hard landscape, such as paths, walls, water features, sitting areas and decking; as well as the plants themselves, with consideration for their horticultural requirements, their season-to-season appearance, lifespan, growth habit, size, speed of growth, and combinations with other plants and landscape features. Consideration is also given to the maintenance needs of the garden, including the time or funds available for regular maintenance, which can affect the choices of plants regarding speed of growth, spreading or self-seeding of the plants, whether annual or perennial, and bloom-time, and many other characteristics.

The most important consideration in garden design is how the garden will be used, followed closely by the desired stylistic genres, and the way the garden space will connect to the home or other structures in the surrounding areas. All of these considerations are subject to the limitations of the budgetary concerns for the particular project and time. Budget limitations can be addressed by a simpler more basic garden style with fewer plants and less costly hardscape materials, seeds rather than sod for lawns, and plants that grow quickly; alternately, garden owners may choose to create their garden over time, area by area, putting more into each section than could be handled all at once.