Bush Tucker is a name that is sometimes given for fruit and vegetables that are indigenous to Australia. These fruit and vegetables have adapted over a long time to the climate, soil and animal conditions in Australia. A lot of the fruit and vegetables in A Patch from Scratch have been introduced to Australia from somewhere else. This can mean that they are not as adapted to the conditions here and can become infected with disease or eaten by animals more easily.
There are benefits to eating bush tucker as they can be very high in the nutrients we need for health. You might want to experiment with introducing some of these traditional foods to your patch from scratch. Indigenous people of Australia have a wealth of knowledge about how to use these fruits and vegetables for health.