Sustainable landscaping encompasses practices that improve the environment while creating aesthetically pleasing landscapes. It aims to minimize inputs like water, chemicals, and fertilizers and outputs like plant trimmings and polluted runoff. The main components of sustainable landscaping are water, soil, plants, and air. Some principles include using greywater and rainwater, choosing plants suited to the soil type, and selecting plants that require fewer resources and create less waste. Performance measures to evaluate sustainability include metrics like CO2 emissions, biomass levels, and impacts on livelihood, ecosystem services, pollution, and resources.