Spyke
mander.xyz

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)

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Yes thats it, the images in the linked Wikipedia page look exactly like the plants in my yard thanks 😸

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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

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Automatic identification via PlantNet summary

Most likely match: Oxalis latifolia Kunth

Common nameScientific nameLikeliness
Broadleaf woodsorrelOxalis latifolia67.50 %
Pink SorrelOxalis articulata13.91 %
Violet woodsorrelOxalis violacea9.55 %
Pink woodsorrelOxalis debilis1.56 %
Purple shamrockOxalis triangularis0.65 %

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What is this plant? Found in my yard in Sydney Australia | Spyke