Old-man Saltbush Atriplex nummularia is a great permaculture plant for central Australia. It Grows and self seeds easily, is a great source of fodder for animals, can gow big enough to make effective wind breaks, can be harvested for mulching and stabilising areas (especially salty areas) and of course food for ring neck parrots!
One plant established itself on my front verge last summer from what must have been wind blown seed and its now waist high and I clip it regularly for the rabbits.
Harvesting saltbush is pretty straightforward. Just put something underneath the branches then scrunch the dry seeds which will easily fall off. It took me less than 20 minutes to harvest 2 large plastic bags full of seed. I have transferred them to a plastic hessian bag for further drying and I’ll then place them in the freezer to kill all the bugs that I have picked up in the process.I don’t know that I will be able to separate leaves from seeds very well because they are both papery and light.