We had a grevillea in our backyard planted ourselves about 20 years ago. However, due to over-watering a fungus has killed it. It had two trunks - the first broke some time ago. A strong wind caused the second trunk to break off. Unfortunately, it was only pruned to shape recently. Fortunately, its replacement had already been planted.
A sprinkler that used to water lawn had not been capped off. It has now been moved to a new vegetable garden.
In conclusion - make sure Australian natives don't get too much water, or they can actually die.