Answer: Allamanda or Golden Trumpet is a vigorous vine growing to 60 inches. It is known for its huge yellow flowers which usually appear in early fall. Its disadvantage is that it takes a lot of space and needs a large container. Give full sun and plenty of water during summer. Give it a rest in winter, keeping it barely moist. In the spring cut it back to 6 inches, repot, and provide ample water and sun.
Remember that although this plant likes moist soil, it should not be allowed to sit in water. Your dropping leaves are likely a moisture problem.
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