Oleander refers to a group of flowering shrubs and small trees that belong to the genus Nerium. These plants are known for their attractive flowers and are commonly grown in gardens and landscapes in warm climates. Here's some information about oleanders:

1. Appearance: Oleander plants typically have lance-shaped, leathery leaves that are arranged in whorls along the stems. The flowers are large, showy, and come in a variety of colors, including white, pink, red, and yellow. They bloom in clusters from spring to fall.

2. Toxicity: It's important to note that oleanders are highly toxic to humans and many animals if ingested. All parts of the plant, including the leaves, stems, flowers, and sap, contain toxic compounds called cardiac glycosides. These substances can cause severe health problems, including heart arrhythmias and gastrointestinal issues. Exercise caution when handling or planting oleanders, especially if you have pets or young children.

3. Cultivation: Oleanders are native to the Mediterranean region but have been widely cultivated in other parts of the world. They thrive in warm climates and are tolerant of various soil types, including sandy and poor soil. They require full sun exposure to bloom abundantly. Proper pruning can help maintain their shape and promote healthy growth.

4. Landscaping use: Oleanders are popular in landscaping due to their attractive flowers, evergreen foliage, and tolerance to drought and salt. They can be used as hedges, screens, or accent plants in gardens, parks, and along roadsides. Their dense growth and ability to withstand coastal conditions make them a favorite choice in many seaside areas.

5. Propagation: Oleanders can be propagated through seeds, stem cuttings, or layering. However, it's important to exercise caution when handling the plants and their parts, as even the smoke from burning oleander can be toxic.

6. Cultural significance: In some cultures, oleanders have symbolic meanings. For example, in Greek mythology, the plant is associated with the god Apollo and is believed to bring good luck and protection. However, due to their toxicity, it's important to be mindful of their potential dangers.