Cascabela thevetioides, commonly called yellow oleander, brings tropical elegance to warm gardens with its glossy, alternate-leaved foliage and brilliantly fragrant yellow flowers. Native to the West Indies, southern Mexico, and Belize, this evergreen shrub grows 8 to 15 feet tall in ideal conditions, though it's easily managed in containers or as a trained standard. Hardy in zones 10-12, it thrives in full sun to partial shade and produces showy fruit that extends its ornamental appeal well beyond the blooming season. In cooler climates, gardeners treat it as a tender annual or overwintered houseplant, bringing it indoors to a cool basement or garage to rest through winter.
Partial Sun
Moderate
10-12
180in H x 96in W
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Moderate
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Yellow oleander's real strength lies in its ability to transform from a delicate bloomer to a fruit-bearing focal point. The fragrant flowers are unmistakably showy, but the persistent, colorful fruit takes center stage once blooms fade, providing months of visual interest that few other shrubs can match. Its moderate water and maintenance needs make it surprisingly approachable for a tropical specimen, and its suitability as a hedge plant means you can create living screens with genuine ornamental impact.
Cascabela thevetioides excels as a hedge plant, forming dense, ornamental screens when multiple shrubs are planted together. Its year-round foliage and seasonal display of fragrant flowers and showy fruit make it equally valuable as a specimen plant in mixed borders or as a feature in tropical and Mediterranean-style gardens. Container cultivation is equally important; gardeners in colder zones grow it as a movable focal point on terraces and patios, overwintering it indoors to extend its presence through the year.
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After the last frost date, harden off container-grown plants by gradually exposing them to outdoor conditions over 7-10 days. Transplant into well-draining soil in a location receiving full sun to partial shade. Space plants 6-8 feet apart if using them as a hedge.
Prune yellow oleander in late winter or early spring to shape the plant and remove any winter-damaged wood. Container plants trained as standards benefit from annual pruning to maintain their form. Remove crossing branches and any growth that crowds the center to improve air circulation and reduce pest pressure.
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“Cascabela thevetioides belongs to the apocynaceae family, the same lineage as the familiar oleander (Nerium oleander), though the two are distinct species with different flower colors, leaf arrangements, and growth habits. Yellow oleander arrived in cultivation from its native tropical range in the West Indies, Mexico, and Belize, where it thrives in warm, humid climates. Its introduction to temperate gardens came through the work of horticulturists and botanical institutions who recognized its potential as both a landscape specimen and a container plant that could winter indoors.”