Australian plants are worthless.
There are lots of useful spices and ingredients and such in Europe and almost wherever humans have went they have found useful things, they found coffee in Africa, Nutmeg in the west Indies, sugar cane, cocoa and potatoes in the new world etc.
But when they came here they found nothing, there is nothing from Australia that people use to cook with or that has any use, really the only thing people took out of Australia was the gum tree and that is a terrible tree.
Sad.