What is this plant? Found in my yard in Sydney Australia
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Sounds like Oxalis latifolia it is a common invasive species in australia.
(I am no expert so take my ID with a grain of salt)
Yes thats it, the images in the linked Wikipedia page look exactly like the plants in my yard thanks 😸
This is based on the large leaves with a fishtail shape and the purple pink old flowers. also it seems it does not spread by seed rather it "reproduces by bulbs and bulbils produced from the underground stems." source