Identify a plant that is doing well in your garden that you are happy to see more of.
Pick a corner of your nature strip that is not driven or walked over regularly and get the shovel. The dirt might be hard, so dig deep and add a lot of organic matter into the hole before you plant. Dig up one of the plants from your garden and move it to your new spot.
Water well and watch.
The point of using an existing plant like that is you know it will actually grow and it costs you nothing in case someone protests, rips it out
or calls the style police to discuss your taste in tubers.
If you want to plant trees, dial before you dig so you know you are not planting on a gas pipeline.
Check out where the powerlines are and the height of your planned
Find a food tree that does well in your area and does not need a lot of care. Source a seedling and plant it.
Look up Miyawaki forest and plant a mini forest outside your front fence.
Check that the food plant you are about to install is not a noxious weed or the sworn enemy of your local Landcare group. Coffee and Brazilian cherry are great street trees that provide food but spread quickly and are often unwelcome.
Council may want you to register what you are planting.
Talk to the neighbours. Councils generally respond to complaints. Avoid grumpy neighbours and stay under the radar.