Allamanda cathartica
Golden Trumpet

 Growth Forms:
 Hardiness:
 Deciduous / Evergreen:
 Flower Notes:
Yellow (4-5" dia. yellow, trumpet-shaped flowers produced throughout the year)
 Foliage Notes:
Green (Large, light-green, evergreen leaves are whorled)
 Fruit Notes:
Brown (Not ornamentally important)
 Ultimate Height:
10-20 feet
 Ultimate Spread:
3-6 feet
 Light Requirements:
 Soil Notes:
Adapts to a wide variety of soils
 Range:
Brazil
 Diagnostic Characteristics:
Leaves whorled, oblong-lanceolate, acute-acuminate, 4-6" long, mostly 1.5-2" wide; inflorescence of about 10 flowers; corolla tube 1.5" long (or more), the spreading lobes totaling 2.5" wide (or more), bright yellow; stamens very short.

Additional Information

Can be grown as a small shrub if pruned regularly. Quite tolerant of many soil types. Full sun needed for maximum flower show. All Allamandas are poisonous. Caterpillars and mites can be problematic. Not salt tolerant. 'Hendersonii' is most often planted, while 'Yellow Butterflies' is compact with many large yellow flowers.

Other plants like this Allamanda cathartica (Golden Trumpet)

The Purdue Arboretum is a collaboration between the Department of Horticulture and Landscape Architecture and Physical Facilities Grounds Department

Purdue Arboretum, 625 Agriculture Mall Dr, West Lafayette, IN, 47907
© 2025 Purdue University | An equal access/equal opportunity university | Integrity Statement | Copyright Complaints | Maintained by the Purdue Arboretum
Contact Purdue Arboretum at arboretum@purdue.edu for accessibility issues with this page | Accessibility Resources | Contact Us