An annual with ephemeral tendencies, producing seeds for a long period. It spreads to form a small clump about 4 cm high, by creeping hairy stems and is found in poor, free-draining soil. The name may derive from 'perce-pierre' as it seems to 'break through' stoney ground and for that reason it was used medicinally to treat kidney stones. Small quantities can be added to salads.
Minute green flowers at the base of the leaves from April to September.
It is crowded out by more vigorous plants so if it is in the lawn, allowing the grass to grow a bit longer and applying some fertilizer should remove it.

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