It is not gardening. Bush regeneration is the restoration and maintenance of natural ecosystems which have suffered some level of degradation. This is done by removing or reducing threatening processes and weed species which are detrimental to these areas.
Retain first: Conserving existing natural areas is the first priority.
Regenerate second: 
This involves mitigating threats such as weed invasion to encourage natural regeneration.
Replant last: Planting is only considered after a site’s natural ability to regenerate has been assessed as very poor.
This workshop hand-out gives you basic principles and strategies for bush regeneration and takes you through our approved methods of weed control. Click  Bush Regen hand-out for the full document.