The yellow-flowered oxalis that carpets disturbed soil through winter.
Blankets disturbed ground through the cooler months and competes with native seedlings. It spreads from underground bulbils, which is why cultivation and shallow digging just spread it further.
Very hard to remove once established. Avoid disturbing the soil, which scatters the bulbils. Persistent spot spraying in active growth, and restoring dense native ground cover to shade it out, are the practical tools. Manage expectations: this is a long game.
Dominant groundcover across the block.
Widespread on Mount Skye.