Sustainability can mean different things in different contexts.
In context of the landscapes we create, sustainability means:
Organic based soil conditioners
Biodegradable weed control techniques
Minimal use of herbicides
Precise plant choice for environmental conditions
Well proven planting techniques
Mulching of all plantings
Locally sourced materials such as mulch and compost
Minimal tilage of soil
Promotion of organic matter content in soil
Well thought out erosion control techniques
Minimal and efficient use of irrigation
Thoughtful plant choices and landscape features to provide
habitate for and encourage beneficial insects, birds, lizards,
frogs and other helpful animals.
Promoting and creating permeable surfaces to maximise on site use of rainwater and to prevent run off and storm water pollution.
The use of plants that require little of no pruning
In other words, sustainability means a healthy and beautiful garden/landscape that takes minimal effort to maintain and impacts the environment positively .