Do not allow them sit in puddles of water and make sure the drainage holes do not become plugged. by wilma. The reasons for a bougainvillea not blooming are the following: Wrong soil Not enough Light Over-watering Overfeeding Re-potting Heavy Pruning or no pruning Learn how to how to keep bougainvillea blooming or how to force your potted bougainvilleas to bloom by taking proper care of light, watering, fertilizing, pruning and re-po… There are more than 300 cultivars with different colors of bracts, most of which are complex hybrids between different species. This will promote healthy growth in the spring. We gardeners dread having to face the rigors of bringing in our tropical patio plants. Like cactus, your bougainvillea is actually native to very arid conditions so water it only when the top two inches (5 cm.) Super floriferous tropical vine produces multicolor blooms, perfect for adding color to sunny spaces. Pick your site carefully upfront, so the plant won't need to be disturbed. Fertilize bougainvillea plants that look unhealthy. After the bougainvillea has finished blooming for the season, cut it back by a few inches. Los Angeles Times: Bougainvilleas: Summer Is Their Time of Year, Missouri Botanical Garden: Bougainvillea (Group). Bougainvilleas require warm weather. Bougainvillea . Bougainvillea can technically be pruned at any time of the year, but the best time to do so for the integrity of the plant is in very early spring, before the plant has begun to produce buds for new flowers. Fall or winter pruning stimulates vulnerable new growth susceptible to cold. Plant in full sun. It’s recommended that you only trim right after a bloom if you trim at all. Regular bougainvillea care involves trimming after each bloom cycle and then fertilizing to promote new growth and new flowers. Mature, established vines rarely require watering. Some growers choose to plant their bougainvilleas in pots buried in the ground, which works to marry the concept of root binding with landscape integration. This plant also loves the heat. Wear gloves when pruning bougainvillea. The tropical blooming machine will be colorful all winter if you keep the greenhouse temperatures between 50 degrees F. And 110 degrees. Not enough sun = not enough color. For example, it is not unusual to grow a bougainvillea in a 1 gallon pot … Plants, after all, need careful, dedicated care, so no flowers on bougainvillea must mean that they’re not getting enough food, water or light. This can vary depending on where you live. The blooming cycles last four to six weeks; prune and pinch after the blooming cycle. Like other plants, too much nitrogen encourages bougainvillea to add lots of vegetative parts like leaves and stems at the expense of buds. More than that and you’ll encourage root rot and discourage blooms. A bougainvillea not blooming is a problem that’s easy to overcome, provided you think differently about your plants. Selected physiological and biochemical parameters were monitored at the vegetative and reproductive growth stages in potted Bougainvillea plants treated with five different concentrations of TRIA. Trim each branch about 6 or 8 inches from the tip. A bougainvillea blooms best when pot-bound so do not be tempted to re-pot unless you must. If you live where in a climate where bougainvillea is borderline zone hardy (see zones below), then planting it against a warm wall or in a corner against the house will help. Pruning in summer eliminates blooms. To ensure that bougainvillea blooms abundantly, strategically put it at a location where it is exposed to the direct… That being said, they need to be cared for like weeds if you’re to find success with them. Prune the bougainvillea. Water your plant about once a week, but let it dry out between waterings. When pruning bougainvillea, wear heavy gloves and long sleeves to protect against treacherous thorns. If your bougainvillea has bloomed in the past but suddenly stopped blooming, check for tree branches that may have grown over them and are now blocking the sun from shining on the plants. So never be in hurry to re-pot. They flourish with calculated neglect. To promote maximum color, give bougainvillea the sunniest spot in the garden, protected from wind, cold and frost pockets. with its vibrant, flamboyant blooms, you may yearn for that same look -- even on a smaller scale. I’ve never grown one indoors but know you need high light, low water. Hi Kathy – Common causes for a bougainvillea not to bloom are: not enough sun, not enough heat, too much water, or too much fertilizer. Temperatures consistently colder then 40°F (5°C) result in dying bougainvillea. Give the plant some fertilizer with bloom booster each time you do this "haircut" to encourage the next set of blossoms. 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