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Growing The Allamanda Plant Allamanda is a strong vine plant/climber, large yellow blooms with shiny deep green, leathery, 2-4 inch evergreen leaves, with large clear yellow flowers. Flowers and Fragrance The bell-shaped allamanda flower is very fragrant, yellow and appearing in summer can reach 4-5 inches across. Flowers can last until late November and into December in the South. How To Care For Allamanda Overall, the Allamanda vine perfectly combines the beauty of their whorled leaves, trumpet-shaped flowers, and twining growth, to make them garden favorites. Light and Temperature In its native habitat, new shoots find their way to the tree tops to get all the sun they can, while keeping the dark green leaves protected in semi-shade. A lover of sun, it needs lots of sunshine, so if possible, mimic nature and shade the plant but give the tips lots of sunshine. Keep temperatures and humidity high if possible. Watering Your Allamanda & Fertilizing When in full growth season, in high temperatures and humidity Allamanda requires lots of water. During its flowering period pay attention to the plant’s water use. Very often it requires some extra water to avoid flower loss. Fertilizing Allamanda is best with a liquid food once every two weeks during active growth. Soil and Planting As with many vines Allamandas like good, rich soil. If grown in a container transplant every two years. If the plant is large, do not step up to a bigger pot, but prune the roots instead and replace with a rich potting mix. Providing support with a trellis will allow the plant to “show off” to its fullest. The photo at the right is of Allamanda ‘Golden Trumpet’, one popular variety of Allamanda plants.