The garden hasn't been put much care over the past, just generic weed pulling, the timber beneath the weed are old, hope we can do something not too costly with the original plants, such as grow grass or synthetic grass between the plants.
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Welcome to the Bunnings Workshop community @johncen and thanks for such an interesting conversation starter.
We might be able to be more specific with our advice if you could let us know where you are in Australia and how much sun this garden gets. In the meantime, you might find some inspiration in this collection of our top 10 most popular garden makeovers. Our How to section also has some useful ideas, specifically @Adam_W's articles How to plan a garden makeover and How to give your garden a makeover. Let me tag @Noelle and @CathM who may have some suggestions to get us started.
I'd be interested in hearing more about what you would like to achieve with this make-over. What don't you like about the current garden, what would you like to see more of, and what are some items you would like to add? Perhaps you'd like a water feature, some tiered gardens or a rockery and maybe more flowering plants? Here's a great garden planner from Gardena, which you'll find useful in setting out your ideas.
You might like to get started by removing all the weeds and grass from between the plants and covering those areas with several layers of newspaper and some hardwood mulch. Once you've established the plants you'd like to keep, you can work from there, adding to the selection.
I look forward to hearing more about your project and providing some advice and inspiration. Please have a read through the articles provided by @JaneK above and let us know if you have questions.