Belongs to the Apocynaceae family, Allamanda Williamsii is also known by common names Yellow Allamanda, Golden Trumpet vine and Double Blossom. Native to Brazil, it is an eye-catching, ever-blooming, climbing vine, evergreen shrub. Grows up to 72 inches tall, the shrub produces showy, large, bright yellow, trumpet-shaped, double blossom flowers, with 3 inches width, slightly fragrant. Grows the best in well-drained soils, full sun, and average water. With milky sap, the plant is considered poisonous. Propagation is very easy, by seeding and cutting.