Bougainvilleas are frequently grown as an annual in areas with cold winters. I have had these plants for years, but I have never had an issue with the blooms until recently. My bougainvillea with some leaf and flower drop due the cooler temperatures. How to Grow Bougainvillea. The bright, elegant vines are easy to … Barbara Karst Bougainvillea flowers and leaves turning brown, drying, and falling off, need expert g - Knowledgebase Question. Bougainvilleas are tropical plants that grow on vines with clusters of pink, lavender, red, gold or orange bracts. A bract is a modified leaf. Bougainvillea is a tropical vining plant, with some varieties growing up to 30 feet. Proper pruning is important for bougainvillea to bloom. My Bougainvillea glabra, which you’ll see in the video below, is a flowering machine. Question by jhh4 July 15, 2005. It was blooming nicely and looked great. The most common causes are low light levels, frost, and repotting. Lawns. 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? San Bruco, CA. Many plants, especially many of our tropical houseplants will respond to a drastic change in environment by dropping their leaves. Help answer a question about Why is my bougainvillea dropping leaves? I bought a bougainvillea - about 5 ft high so fairly established - at the Farmer's Market about a month ago. Bougainvillaeas originally came from Brazil so it's a semi-tropical plant. I had no experience growing bougainvillea until a bought a house with 3 of them on the property. It … Some bougainvillea varieties benefit, too, from long nights and short days and bloom best in fall. 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. I purchased several big Barbara Karst Bougainvillea from Golden Nursery in San Mateo, CA. Also, help answer other questions about General Gardening and Bougainvillea Plants, and plants at GardeningKnowHow.com Your bougainvillea has responded to its change in location and associated environmental conditions in this manner. 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. Pinch off about 1/2 inch of the stem tips and prune plants in early spring to encourage more flowers. Bougainvillea is native to hot, sunny and dry areas of South America. Shock causes it to lose its leaves and flowers. - Gardening Know How Questions & Answers. Bougainvillea pruning encourages new growth and blooms., pruning overgrown bougainvillea is actually a bloom booster. The attractiveness of the plant is not just in its showy foliage, but in its easy care. Plants will flower for weeks, then rest before blooming again. It sounds like the latter was the cause, and it's now recovered with leaves and flowers. therefore it is relatively cold sensitive (hardy in USDA zones 9). 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.