Colocasia esculenta

Tall, robust, deciduous perennial that grows up to 2m in good conditions and spreads easily via long runners.

Grown for its dark green, arrowhead-shaped leaves and dark stalks. Plants can be very variable. Leaves and stalks can be white, mottled, green-reddish or purple-tinged to almost black. The flower is stout and short. This species seldom flowers and fruits even more rarely. As the common name suggests, each leaf resembles an elephant's ear.

Best grown in fertile, moist soil in partial shade or filtered sun. Plant in locations protected from strong winds.

Always choose healthy, well-grown plants. The best time to plant is in late spring to early summer. Planting success is often improved on clay soils by adding extra topsoil and forming raised beds. Incorporate coarse sand, bark, compost or other organic material to improve soil structure. Dig a hole in the ground twice the size of the root ball. Before planting, ensure that the root ball is saturated and remove planter pot with minimal root disturbance. As soil is placed in the prepared hole, tread firmly to bring soil in close contact with the root ball. Water thoroughly, making sure that moisture penetrates to the depth of the root ball.

Colocasia are low maintenance plants but will benefit from being mulched annually to suppress weeds and conserve moisture. Feed in spring with a balanced fertiliser (such as blood and bone) at a handful per square metre.

No pest and disease issues.

Perennial Garden

All parts of the plant are poisonous. However, roots and leaves may be eaten after cooking. The species is commercially grown as a food crop in Hawaii (poi made from tubers), where it is commonly called taro.