Plants will flower for weeks, then rest before blooming again. It was blooming nicely and looked great. Bougainvillaeas originally came from Brazil so it's a semi-tropical plant. San Bruco, CA. It takes to pruning, it takes to pots and it can support itself on its woody growth or climb on supports provided. I hadn't yet got round to repotting it into a nicer container but it's been on my balcony in full sun from 1pm till sunset (and by full sun I mean full, searing, scorching sun. Bougainvilleas are tropical plants that grow on vines with clusters of pink, lavender, red, gold or orange bracts. Bougainvillea pruning encourages new growth and blooms., pruning overgrown bougainvillea is actually a bloom booster. A bract is a modified leaf. It sounds like the latter was the cause, and it's now recovered with leaves and flowers. I have had these plants for years, but I have never had an issue with the blooms until recently. Shock causes it to lose its leaves and flowers. I bought a bougainvillea - about 5 ft high so fairly established - at the Farmer's Market about a month ago. The most common causes are low light levels, frost, and repotting. How to Grow Bougainvillea. Bougainvillea is a tropical, shrub-like vine that bursts forth with colorful flowers for 11 months of the year if it's planted in the right climate. I had no experience growing bougainvillea until a bought a house with 3 of them on the property. Hibiscus is a tropical flower that can produce extremely bright and colorful blooms, but recently, the blooms on some of my plants have been budding, but they fall off right before the bloom opens. therefore it is relatively cold sensitive (hardy in USDA zones 9). Some bougainvillea varieties benefit, too, from long nights and short days and bloom best in fall. Help answer a question about Why is my bougainvillea dropping leaves? The bright, elegant vines are easy to … Your bougainvillea has responded to its change in location and associated environmental conditions in this manner. My bougainvillea with some leaf and flower drop due the cooler temperatures. The 1st winter they all of a sudden started loosing leaves so I had to ask the question: why are my bougainvilleas dropping lots of yellow leaves? Barbara Karst Bougainvillea flowers and leaves turning brown, drying, and falling off, need expert g - Knowledgebase Question. I purchased several big Barbara Karst Bougainvillea from Golden Nursery in San Mateo, CA. Bougainvilleas are frequently grown as an annual in areas with cold winters. The attractiveness of the plant is not just in its showy foliage, but in its easy care. 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