Warm-region gardeners are fortunate to be able to add bougainvillea shrubs or vines to home growing areas. With their bright blossoms that often bloom profusely throughout the entire growing season, bougainvillea will add color and dynamic interest to any landscape area. Place bougainvillea in full sun and provide well-draining soil to ensure a thriving and healthy plant. Fertilize bougainvillea regularly throughout the growing season and your diligent efforts will be rewarded with prolific blossoms.
Sprinkle the slow-release granular fertilizer over the soil in early spring. Consult the fertilizer package for recommended amounts for the size of your growing area, and add the fertilizer over the soil carefully. Do not allow the fertilizer to touch the stems or the foliage of the bougainvillea. Work the fertilizer into the soil with the hand rake, and water the soil generously to help the granules soak into the soil.
Fertilize the bougainvillea with the water-soluble fertilizer twice a month during April, May and June. Mix the fertilizer with water according to package recommendations, and pour the fertilizer carefully over the soil.
Decrease the fertilizing frequency to once a month between July and September to enable the bougainvillea to increase blossom production.
Repeat the slow-release fertilizer application again in August using the same method you started with in March.
Suspend fertilization from October through February while the bougainvillea is dormant.