Agonis flexuosa aka Willow Myrtle

Agonis flexuosa has two common names: peppermint tree and willow myrtle. It belongs to the myrtle family, Myrtaceae. It comes from southwestern Western Australia. There it grows near the coast in a mild, subtropical climate. This evergreen plant can grow as a tree or shrub. Garden trees reach 25–35 feet (7.6–10.7 metres) tall. Their spread reaches 15–30 feet (4.6–9.1 metres). Growth is fast, so leave room for the full-grown crown.

The crown can be round or shaped like a vase. Older trees take on a weeping shape. Their branches hang down. Fine-textured leaves stay on the plant all year. The narrow, green leaf blades have copper-coloured undersides. Their edges are smooth, and they have no hairs. Leaves grow in turn on each side of the stems. They measure about 0.33–0.5 feet (0.10–0.15 metres) long. Crush them to release a scent like peppermint. The reddish-brown stems bend in a zigzag shape. Bark on mature trees feels rough. It peels away as the trees age.

Small white flowers grow in groups where leaves meet stems. They open in spring and make a showy display. Each flower has a star shape and six petals. Flowers measure about 0.04 feet (0.013 metres) across. The fruit grows in groups and appears in summer. Each tiny fruit is a capsule with three valves. Birds eat the seeds, which gives the tree value for wildlife. Its leaves, blooms, and hanging branches add interest to gardens.

The tree grows best in full sun. It can also grow in part shade. Clay, loam, and sand suit it if they drain well. Its listed soil range runs from neutral to alkaline. It grows well in moist soil. Once plants take root, they can withstand drought. They also cope with moderate amounts of salt. Warm gardens near the coast with mild winters suit this species. Its listed USDA hardiness range is zones 9–11. Shape young plants to grow as a tree or shrub. Make shaping cuts in late winter. To grow new plants, take semi-hardwood cuttings. Do this in late spring or early summer.

Plant it as a specimen, street tree, or park tree. Large yards offer room for its wide crown. It also suits winter gardens and children's gardens. It needs a moderate amount of care. Phytophthora and root rot can cause harm. Watch for scale insects, mites, and sawflies. Borers and mealybugs can also cause problems. Records note antiseptic uses, but do not show food use or safety.