Callistemon citrinus, also known as Crimson Bottlebrush is a shrub in the family Myrtaceae. It is native to south-eastern Australia. It grows to between 1 and 3 metres in height and has leaves which are 3 to 7 cm long and 5 to 8 mm wide. The flower spikes are 6 to 10 cm in length and about 4 to 7 cm in diameter. These appear in November and December.

C. citrinus can be grown outdoors in warm, dry climates, with a minimum temperature of 7 °C. It thrives in well-drained soils rich in organic matter, and direct sunlight. Indoors, it will grow well in normal room temperatures and low humidity. However, it requires more sunlight than most houseplants. Plants will benefit from being moved outdoors to a sunny area in summer. New plants can be grown by taking stem tip cuttings in spring or early summer. Plants can also be sown by seed in spring.