A well designed landscape is an art and a science. It is a living breathing artwork. It must look like a painting (making it an art), and it must thrive with the soils, lighting, temperature and other requirements (making it a science).
As in an artwork a landscape or garden must repeat colors to create unity, it must create a path for the eye. Unlike a painting a garden should draw and beckon you in. Inviting you to explore its hidden wonders. Unlike a painting a garden will evolve almost daily and a well planned garden will introduce to you new colors constantly. New flowers will grow and old ones will fade.
Gardening is also a science. It requires a knowledge of soils. How to amend and improve, pH and how to adjust it. It is a science because it requires a knowledge of plant cultures and which plants will work under what conditions. It is a science because a gardener will need to consider lighting requirements, temperatures, climates, and plant culture. It is a never ending but exciting challenge.
A well planned and cared for garden or landscape is an art and a science which will bring beauty and enjoyment for many many years.