Libertia grandiflora (tukauki or mikoikoi) is a flowering plant in the family Iridaceae. The species is endemic to New Zealand. It is a clump-forming herbaceous perennial growing to 90 cm (35 in) tall by 60 cm (24 in) broad, with leathery linear leaves and panicles of white flowers in spring, followed by seed capsules. The Latin grandiflora means large flowered. In cultivation this plant requires a sunny, sheltered location and protection from winter frosts. It has gained the Royal Horticultural Society's Award of Garden Merit.