Hi @chickenhead,
I'd suggest using Scotts Osmocote 500g Native Controlled Release Fertiliser as opposed to the potting mix. This is a controlled release fertiliser that will break down over time releasing the nutrients your natives need for longer. Ensure you follow the manufacturer's instructions on the quantity of application based on your garden area.
It's also a good idea to water deeply, but infrequently to encourage deep root growth. In the establishment stage, this is roughly 1-2 times a week depending on soil circumstances. Ensure the water is moist, but not waterlogged. Native plants are adapted to handle periods of drought so once they are established this can be reduced to once every 2-4 weeks.
Mulching your gardens is also a good way to keep weeds down, retain moisture and improve soil health. Natural mulches such as this Pine Bark Mulch will break down over time releasing nutrients into the soil. It will also act as an insulative layer, keeping the soil warmer during the cold months which is beneficial for root growth and overall plant health.
Promoting an environment that is good for native wildlife is also a great idea. Bird feeders and bird baths are a great way to attract wildlife to your garden, which will help to increase ecological diversity which is always a good thing for native plants.
You might like to check out How To Design A Thriving Native Garden and Australian Native Tree Growing Guide for some further information.
Also, allow me to tag @Noelle to see if she has any other advice.
Jacob
