Oleander (Nerium oleander) is a shrub or small tree that blooms in summer with large, striking flowers in shades of red, white, light yellow, and pink. Because of its dense branching and rapid growth rate it is a popular hedge. Planting an oleander hedge is an excellent way to hide utilities, chain link fences, and other eyesores in the landscape. It also makes an attractive specimen plant if planted singly or in a garden border. An oleander shrub is a poisonous plant.
While it can reach twenty feet, oleander takes well to pruning and is typically kept at six to ten feet. Tolerant of dry soils and hot sun, an oleander bush is an excellent plant for the desert, but can thrive in warm, humid climates as well.
Growing Requirements and Care for Oleander
For the best flowering, plant oleanders in full sun, but in very hot climates they bloom more reliably in light shade. Oleanders tolerate a range of soil conditions, from dry sandy soils to moist clay soils. They grow best where the weather stays above freezing, although they can tolerate short periods of below-freezing temperatures.
Depending on how an oleander flowering shrub is to be used and the size of the cultivar, the ideal planting distance ranges from five to ten feet. In the right climate oleander is easy to grow and requires no special care beyond annual pruning and feeding. They can also succeed in partial shade.
Oleander can be grown as a potted oleander provided that the container is large enough.
Prune after flowering to stimulate new branches, control size and shape, avoid leggy growth, and encourage next year’s flower buds. Remove suckers, which can interfere with flowering, and dead branches.
Propagate an oleander shrub by taking cuttings of healthy, young stems in summer and rooting them in a mix of sand and peat.
Oleander Pests and Diseases
Oleanders generally have no serious insect or disease problems. In humid climates aphids and scale insects may be a problem. Caterpillars can strip oleander leaves in just a few days.
All parts of oleander are poisonous. They contain a toxic chemical that can cause illness, skin irritation, or even death if eaten in enough quantity. Fortunately the plant has an acrid taste that causes a gagging reaction in most people that causes them to throw up. Burning oleander also causes toxicity, so it should never be put in a burn pile, nor should it be used as a stake for roasting food over a fire.
Wearing gloves while working with oleander may prevent allergic skin reactions. Because of its toxicity, oleander is not recommended for playgrounds or other places children play.
Want to Learn More About Oleander?
Learn more about the history, folklore, and culture of oleander at these sites:
Lean all about Oleander from the International Oleander Society.
This site has great information about the Nerium Oleander.
Here’s a .pdf file about Nerium Oleander.