Prostanthera aspalathoides is a small shrub up to 0.5 metres high by a similar spread. The leaves are linear to about 50-75 mm long and highly aromatic. The tubular flowers occur in spring and are usually deep red in colour but yellow and white coloured forms are also known. The flowers are very conspicuous making a very spectacular display.
P.aspalathoides is best suited to dry climates and can be short lived in areas with humid summers. It prefers a well drained position and will tolerate full sun as well as partial shade. Prostantheras respond to well to annual fertilising after flowering and are not as sensitive as some other Australian plants to phosphorus.