Scientific: Thevetia peruviana (Synonym: Cascabela thevetia)
Common: yellow oleander
Family: Apocynaceae
Origin: Tropical America

Taxonomic note:: The Plant List recognizes Cascabela thevetia as the accepted scientific name for yellow oleander; however, ITIS recognizes Thevetia peruviana as the accepted scientific name and this is the resource that I defer too when a plant's scientific name is in dispute.

Pronounciation: The-ve-TEE-a per-u-vee-A-na

Hardiness zones
Sunset
12 (w/ protection), 13, 21-24
USDA 9-11

Landscape Use: Mostly found as a large background screening shrub, foundation plant for large buildings, or as a small multiple-trunk tree. Extended flowering creates an accent effect over the entire warm growing season in Phoenix.

Form & Character: This is an intermediate, awkward-sized, "tweener" woody perennial plant that can be trained in the landscape as either a large shrub or small tree. It's upright and spreading to rounded, clean and shiny with a tropical appearance.

Growth Habit: Evergreen, woody, moderately vigorous to 20 feet tall, but can be effectively maintained at 6 to 12 feet in height.

Foliage/texture: Bright green, glabrous, linear to lanceolate leaves to 6 inches long, nearly sessile; medium fine texture.

Flowers & fruits: Terminal clusters of yellow apricot to orange tubular flowers (rarely white) followed by multicarpulate, greenish, nondescript fruits.

Seasonal color: Yellow or orange flowers during warm season.

Temperature: Hardy to 25oF.

Light: Full sun, but the trunk of yellow oleander will easily sunscald if the plant's canopy base is elevated and the trunk is exposed to direct sunlight. Avoid western exposures!!

Soil: Tolerant

Watering: Yellow oleander, being a shrub that originates from the tropical New World, will require regular and frequent waterings in the Phoenix area to stay vigorous and resistant to heat stress injury, especially during 'The Long Hot Summer'.

Pruning: Light pruning is sometimes warranted to improve shape. Sometimes this large shrub is trained into a small, multiple-trunked tree.

Propagation: Seed and cutting.

Disease and pests: None

Additional comments: This was once a prototypical 'mesic plant' for green landscapes in Phoenix and was popular in Phoenix before 1990. Today however, it is far, far less popular because of the greater societal emphasis on desert landscaping and low water use plants. Like Nerium oleander, all plant parts of Thevetia peruviana are poisonous.

A white flowering cultivar is rarely available in local plant nurseries.