The Brisbane City Council guidelines are at https://www.brisbane.qld.gov.au/clean-and-green/natural-environment-and-water/plants-trees-and-gardens/verge-gardens
What about trip hazards?
A common trip hazard is border edges so your garden must be flush with the concrete path if you have one. The BCC permits organic mulch and I use a thin layer of mulch to protect the soil while waiting for the plants to grow. It is flush with the path so is even less of a trip hazard than the common furrows made by whippersnippers. Tea-tree mulch on the postman’s path through the garden signifies the different function without a need for border edging.
Flowers, Natives or Edible Verges
The edible verge movement has created a lot of interest but low-growing natives and hardy flowers are better options. They have many of the same community-building effects of edible verge gardens and are less likely to be an issue with neighbours if this is the first verge garden in the street.
Further Reading
Understanding the Space is a set of free articles for individuals and groups to reflect on the issues around verge gardening, why you should work within council guidelines and how to stay on-side with your neighbours.