FRom what I have read, natives would simply wait until they flowered (blue). A bit like Commelina and Tradescanthia down this way. One is edible the other is not, but you need to ID them by the flower colour (blue is edible). We show Commelina at our survival school, it was used by Captian Cook to fend off scurvy amongst his crew, hence the common name of scurvy weed. My wife and I use it in our salads.
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