Answer: The name Allamanda includes a group of tropical plants native to the West Indies and South America known for their beauty and versatility. Some are climbers and some are shrubby. Since yours is shrubby, it may be a form of A.neriifolia from Brazil which grows up to 6 feet tall and makes a spectacular conservatory plant when grown in a large pot or tub and it can be summered outdoors. (It will not survive a winter outdoors.) It prefers plenty of sunshine, generous amounts of water and good rich soil.
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