Answer: Bougainvillea (Nyctaginaceae) is an evergreen shrubby vine in tropical climates. They will endure a light frost but not consistent freezing weather. Plant in full sun, in rich, well-drained soil. Feed the plant in spring and again in summer and provide a trellis or other support for the vining branches. Bougainvillea respond to heavy pruning by sending up an abundance of new flowering stems. The vibrant color of the bougainvillea comes from three large bracts that surround the tiny flowers.
You didn't say if you had transplanted it into the ground or not. If you did, it's probably just transplant shock. If it's in a container, it may need fresh soil, more room for its roots and/or fertilizer. Bougainvillea take full sun, and don't like to be overwatered.
Prune some of the stems back and the plant should produce new flowering shoots.
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