Oleander (Nerium oleander) is a tough drought-tolerant plant native to the eastern Mediterranean region. It can be seen in Jordan growing naturally in dry wadi-beds, where it can find underground water at the beginning of summer. It yields a profusion of terminal flower clusters from June to October, with colors ranging from white to pink, crimson, and light yellow.
Water whenever the top inch of the soil becomes dry. If transplanting a container-grown oleander from one pot to another, choose a larger container with drainage holes to prevent the plant from becoming root-bound.
Oleander prefers full sun. It will also tolerate partial shade, but its foliage won’t be as dense. It is also tolerant of heat, drought, wind, and coastal conditions.
Oleander can tolerate light frost and temperatures as low as 20 degrees Fahrenheit. In climates where temperatures reach any lower than that, grow the plant in a container and bring it indoors for winter.
Feed poor soil with light dose of a balanced fertilizer during the plant’s first spring and a light fertilization yearly thereafter. Moving forward, established oleander is not a heavy feeder.