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