Answer: Some bougainvilleas require heat and long summers to bloom; others will perform well with less heat. I suspect the vining bougainvilleas are either Purple Queen or Barbara Karst (both are popular as annuals in cold winter regions). These need full sunshine and a long, hot summer season to bloom well. If they are over-fertilized they tend not to flower so withhold fertilizer this season and see if that makes a difference. Brown edges on the leaves are also an indication of over-fertilization. These bougainvilleas bloom on new shoots so pruning them back or at least pinching out the tips of the stems should encourage new flowering growth. Hope so!
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