There are a few questions to ask before you buy a plant.
Does it suit the climate?
Is the mature plant the right size for the spot?
Will the soil and water requirements be suitable?
I chose our native plants based on ‘Creating a Sustainable, Waterwise Garden’ by Linda Ross. I also worked my way through back issues of ‘Gardening Australia‘ and ‘Organic Gardener‘ magazines from the library and added more natives to my wish list.
A word of warning though, if I bought a plant at the nursery because it looked attractive or had pretty flowers, it was usually dead within a month of planting.