Oleanders start flowering at the beginning of spring, especially in March and last into fall. The flower also blooms on to new growth, but that growth must be of a certain age.

Oleanders are clumping perennials that grow in full sun to partial shade, but if kept in deep shade, Oleander flowering will diminish.

However, Oleanders are also known as drought resistant and light feeders, so you can maintain them if you allow them to bloom indoors.