Bougainvillea performs well in a relatively small container where its roots are slightly restricted. When the plant is large enough for repotting, move it to a container only one size larger. Use a regular potting soil without a high level of peat moss; too much peat retains moisture and may result in root rot.
To grow bougainvillea, plant it in full sun, slightly acidic and well-drained soil, and a relatively hot and dry climate. Continue caring for your bougainvillea plant by watering sparingly, fertilizing every few months, pruning at the end of the season, and training it the climb a nearby wall or trellis.