Prostanthera decussata, commonly known as dense mintbush, is a shrub that is native to south-eastern Australia It has a compact habit, growing up to 2 metres high. The aromatic leaves are ovate in shape and are 4 to 7 mm long and 1 to 3.5 mm wide. Flowers occur from October to March in the species native range.These are mauve, violet or sometimes pink.