What many people think of as the blooms of bougainvillea aren’t actually blooms at all. The showy paper-like structures are a modified leaf called a bract. These bracts hide the actual flowers inside, which are small and trumpet-shaped in whites and yellows. The showy bracts are typically found on new growth, with the showiest display following their winter dormancy. Normally, you’ll see the best blooms following a dry winter.
Where to Plant Bougainvillea
Bougainvillea plants are tropical plants that thrive in hot, dry climates. In areas colder than Zone 9, they are grown as annuals or container plants. In the garden, plant this woody climber next to a fence or supply a trellis or other support.
How and When to Plant Bougainvillea
In the garden, plant these South American natives 6 to 9 feet apart in well-draining soil and away from other plants to give them room to grow. Because they have sharp thorns, locate them several feet away from a walkway or other area of activity. Plant bougainvillea in the garden in spring or summer, which gives the plant time to develop a strong root system before cool weather.
Bougainvillea Care Tips
Light
Since bougainvilleas are tropical natives, make sure they get plenty of sun! Some varieties can handle part sun but won’t perform as well as they could in full sun. In less than full sun, plants will be much more sparse and have a less spectacular flower show, if any at all. On the other hand, keeping your bougainvillea in full sun will keep your plant blooming.
Soil and Water
If you plant bougainvilleas in the ground, make sure they have well-drained soil; they don’t like to remain wet for too long. This plant likes it dry, so water it deeply every three or four weeks, rather than more frequently. If you haven’t had a significant show of blooms recently, try giving your plant a drought period by withholding water. This can sometimes trick your plants into a dormancy period and trigger blooming. If you’re using bougainvillea as an indoor houseplant, plant them in moist, well-draining potting soil and keep the plants mostly dry during winter.
Temperature and Humidity
In the garden, this plant performs best when the temperature is at least 60°F, and it tolerates temperatures as high as 95°F. It thrives in dry conditions. When bougainvillea is grown as a houseplant, it likes high humidity of about 50 percent during the blooming period and lower humidity during the winter.
Fertilizer
Bougainvillea is a heavy feeder. Fertilize the plant monthly during its active growing season. Scratch a granular fertilizer into the soil and water well. If you can’t find a dedicated bougainvillea fertilizer, use a 10-10-10 general-purpose fertilizer.
Pruning
If your plants are getting out of hand, pruning and maintenance are best done in the fall before a new growth cycle. You can also periodically trim rangy stems as needed throughout the year.
Pests and Problems
The biggest threat to bougainvillea plants in the garden is the appropriately named bougainvillea caterpillar. This 1-inch caterpillar dines on the leaves of the plant, leaving them looking ragged. You probably won’t see this pest because when you touch the plant, the caterpillar falls to the ground. If you see leaves that have been munched on, you can treat the plant with a control such Bacillus Thuringiensis.
Training Bougainvillea
When looking for a home for your bougainvillea, think about how you plan to train it. These vigorous-growing plants can quickly take over a wall or garden area, but they can be trained and maintained to fit the desired setting. Bougainvillea can also be used in containers and trained as a shrub or sprawling groundcover. Because of bougainvillea’s woody habit and vigorous growth, these plants lend themselves well to being manipulated in various ways. The most common, especially in tropical areas where plants are hardy, is to allow these plants to climb walls and trellises. This is the simplest way to display the wonderful blooms of bougainvillea. They can also be used in hanging baskets with minimal care. Because these plants don’t have tendrils, they need some coaxing, but no training is necessary as a hanging basket plant.
Types of Bougainvillea
‘Barbara Karst’ Bougainvillea
Bougainvillea ‘Barbara Karst’ is an especially popular variety with large clusters of red bracts all summer and autumn. Climbs to 40 feet. Zones: 9-11
‘California Gold’ Bougainvillea
Bougainvillea ‘California Gold’ is one of the best-performing yellow-flowering bougainvillea varieties. It begins blooming at an early age and produces warm yellow bracts on and off through the year. It climbs to 30 feet. Zones: 9-10
‘Juanita Hattan’ Bougainvillea
Bougainvillea ‘Juanita Hatten’ offers bold fuchsia-pink flowers in summer and green leaves dotted in gold. It climbs to 20 feet.
‘Sundown Orange’ Bougainvillea
Bougainvillea ‘Sundown Orange’ offers bracts that begin deep orange, fade to coral, and mature to salmon pink. It blooms in summer and climbs 20 feet tall.
