It takes to pruning, it takes to pots and it can support itself on its woody growth or climb on supports provided. If the water runs out the bottom of the pot quickly, be sure to put a plant saucer under it. I purchased several big Barbara Karst Bougainvillea from Golden Nursery in San Mateo, CA. It will lose all of the leaves in very short order. The main help is to keep foliage dry by pruning so that leaves receive good air circulation. The Common Diseases Found in Bougainvillea. – Bougainvillea leaves fall: Some specimens of bougainvilleas are deciduous, so they lose their leaves in the fall. Barbara Karst Bougainvillea flowers and leaves turning brown, drying, and falling off, need expert g - Knowledgebase Question. After about 30 minutes, pour off any remaining water in the saucer. I wouldn't repot the bougainvilleas. I hope this helps you with those gorgeous plants, and thanks for reading my article. Lawns. Bougainvillea, however, prefers to dry out a bit between waterings, and needs good drainage. Spacing out your repotting cycle and only increasing the pot size as much as you absolutely must will keep your bloom production high. – Bougainvillea with dry leaves: If the leaves of our bougainvillea dry out and fall, this can be a problem originated by too much heat and low humidity. When your plants are dry, just water thoroughly. Place the plant in a ventilated place and water it. Black Mold. Get rid of infected leaves and infected plants. My Bougainvillea glabra, which you’ll see in the video below, is a flowering machine. This means a bougainvillea planted in the ground will take some time to establish enough roots to bloom well, and that a container grown plant will bloom best when it probably should be repotted. I had no experience growing bougainvillea until a bought a house with 3 of them on the property. San Bruco, CA. Bougainvillea is a tropical vining plant, with some varieties growing up to 30 feet. Bougainvillea actually blooms better when the roots are crowded. Bougainvillea is made up of 18 species, with some varieties hardy in regions as cool as U.S. Department of Agriculture zones 5 … Wait until you can get them into the ground. 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? I recommend this because bougainvillea dislike having their roots disturbed and transplanting usually sets them back for several weeks. Question by jhh4 July 15, 2005. Over winter, water it only very sparingly, but thoroughly when you do — probably once a month or so. If you can keep the soil from drying out too much and if you can keep the roots from baking, your bougainvillea has a better chance of recovering.