Are you someone who pays a lot of attention to open spaces? Are you constantly thinking of how an open space could be transformed into lovely garden or an area that could be used by the public for fun? Are you always looking at colour combinations, in terms of flowers and shrubs? If the answer to any of these questions is a yes, then you could possibly consider landscaping courses as a direction for your future.
If you are not completely sure whether such a course is for you, then you could possibly talk to people who have either taken such courses or to people who teach such courses. Getting some solid answers from these people will give you a clearer understanding of whether this course is meant for you. You could also ask to look at the course material of such courses, because this will allow you to get a better idea of what you are getting into.
Perhaps the best way to get an idea about the domain is to study the market and talk to people who actually work in this field. Professionals who are currently working in the field will be able to tell you the ground realities in a much better manner. If you are lucky enough, one of them might even allow you to work with them on a trial basis, just so that you can get an idea of what you are getting into.
Then perhaps at a later stage, you could consider a Certificate III in Landscape Construction, which will allow you to not only design, but also execute harder structures, such as patios, decks, sit-outs and gazebos.