Here is a guideline to hep you work out how many of which plants should go where:
For a site that has no trees and aims to minimise weeding by attaining close to full native cover of plants in a few years:
Summary per 100 sq m: 272 plants
4 gum trees, 8 wattles,20 shrubs, 40 daisies etc, 100 grasses, 100 spreaders
or by plant numbers: 750 plants covers about 270 sq m or about 10 gum trees
KEEP IN MIND THAT the more grasses and ground hugging spreaders that go in, the sooner there will be less weeding.
BUT the gum trees need a balanced ecosystem, so the site planting needs more lilies, daisies and smaller plants in the long term!!
later plantings to increase biodiversity:
daisies, lilies, smaller plants like bluebells etc
If site has mature trees:
the tree will take most of the water in the area under it’s canopy. Plant densely with all the varieties a few meters out from the base of the tree. In time the seeds thrown by the plants will establish themselves in the dryer area.