Bougainvilleas should be placed in large containers in the garden during summer and should be free of frost in winter, according to the Royal Horticultural Society. They grow best in a bright, sunny area, but they need protection from direct sunlight.Continue Reading
Bougainvilleas can be planted directly in a conservatory border, as they are large climbers, according to the RHS. Add well-rotted compost to enrich border soil and a balanced granular fertilizer or controlled-release fertilizer. The RHS recommends loam-based compost for containers. Provide more water from February to March, as higher light levels and temperatures during this season tend to promote growth. Use loam-based compost to repot in early spring if necessary. During spring and summer, place the plants outside in full sun, preferably when temperatures are between 18 to 21 degrees Celsius. Water the plants generously, and feed them every week with a high-nitrogen liquid feed when they are growing quickly in mid-April. Water the bougainvilleas less frequently in September, as flowering typically ends during this period. Stop feeding and allow them to become drier between watering. Keep them in an area with a minimum night temperature of 10 degrees Celsius.
Prune bougainvilleas in late winter or early spring before growth starts, according to the RHS. Bend and tie the plants in young, sturdy laterals to check the vigor and promote bract formation.Learn more about Outdoor Plants & Flowers