Light. Give it full sun, with 6 or more hours of direct sun a day.
Water. It needs ample moisture, especially while it establishes. The soil must still drain well.
Soil and feeding. It grows best in loamy soil high in organic matter, with an acid to neutral pH.
Size. On a trellis it climbs 4 ft or more. This fast grower can eventually reach 19 ft.
Pruning. It twines around supports but still needs tying, so fasten new stems to the trellis or fence as they grow.
Problems to watch. Spider mites and whiteflies may attack. Spray with Insecticidal Soap following the label.
Good to know. It needs a frost-free spot. All parts are poisonous if eaten, including to dogs and cats. The milky sap irritates skin and eyes, so wear gloves when trimming.
Sources: NC State Extension Plant Toolbox: Allamanda cathartica · Royal Horticultural Society: Allamanda cathartica · UF/IFAS Fact Sheet FPS-31: Allamanda neriifolia, Bush Allamanda (archived copy)
