See how my Bougainvillea glabra looks in the middle of winter: The other reason why yellow leaves fall off of Bougainvilleas in winter is due to a prolonged dry spell. Attracting these animals to your yard can help keep the bougainvillea looper caterpillar population under control. I was reading in a blog, not long ago, where someone had purchased a bougainvillea. It became what I refer to as "sticky". Hope this helps. A dying bougainvillea is often due to over watering, slow draining soils and cold temperatures. Culture - Bougainvilleas grow in USDA hardiness zones 9 to11; however, a majority of the species are confined to only the warmest zones. Bougainvillea bracts are the specialised pink leaves with the delicate flowering in between. I personally water my potted bougainvilleas once every week during the Spring and Summer and find this is the ideal balance to meet the moisture requirements and also stimulate blooms. They do not tolerate frost. Before she died my grandma had planted two bougainvillea's, one red, and one light pink and white. We have gone away in past summers and came back to a totally thriving Mandevilla. If you fear for your shrub, tell if your bougainvillea is dead by assessing the foliage of the plant. I see yours are outside, so try cutting them back and check the trunk for bright light green new growth. This is the first year this happened. I would think that in your climate, you could overwinter a bougainvillea safely outside without fear of freezing to death. The last few winters haven’t been too cold here but they have been dry. It had no leaves or blooms and they felt it was dying and gave up on it. I thought I’d lost it but I cut it back and it’s got lots of new growth. All of our plants did great, including hydrangeas, Jasmine, vincas, and a potted bougainvillea, etc., but the Mandevilla did terribly. Why is My Bougainvillea Dying? "Why won't my bougainvillea bloom?," is perhaps the most frequently asked question among gardeners. And give it a good drink also. A dying bougainvillea is often due to over watering, slow draining soils and cold temperatures. Bougainvillea, many say, color best when somewhat pot-bound. Why is My Bougainvillea Dying? Even with natural predators, bougainvillea loopers can sometimes multiply faster than the predators can eat. I am from the Bay area, zone 9B. Select a species well-adapted to your particular USDA hardiness zones. Although bougainvillea shrubs are sturdy plants that often withstand extensive abuse without showing signs of trauma, they do have a limit to the amount of stress they can tolerate and continue thriving. The pink one died at some point, but the red survived. Most people cut it way back in the fall, and keep it in a garage, basement, or porch (as long as it is not too cold) for the season. 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