Grow in full sun. Bougainvillea must have at least five hours each day of full sunlight for full flowering but will do even better with more. If grown in shade, the plant will survive but not produce flowers.
Plant bougainvillea in soil that is well drained. Purchase a soil mix made for container plants that includes perlite, peat moss and pine bark or similar organic compost.
Feed monthly with a water-soluble fertilizer. Dilute the fertilizer by half the package directions to avoid promoting foliage growth at the expense of flowers.
Prune the bougainvillea throughout the year to promote your desired form. Pinch out stem tips to encourage the plant to become bushy, rather than producing long stems. Pruning and pinching the plant during its rest phase between bursts of flowering will encourage new growth, bringing more flowers.
Water thoroughly only when the soil is dry. Bougainvillea does best when stressed by drought and heat. Excessive dryness can cause the vine to drop its leaves, so water right away if the vine begins to wilt.
Transplant carefully, as bougainvillea does not produce a tight root ball and has a very delicate root system. It does best when kept in a pot that is on the small side and can be kept in a 1 gallon nursery pot for several years. When transplanting or repotting, support the root ball with your hands, as the roots will tear away from the stem, causing the plant to go into shock. Set the plant carefully into its new pot and fill with soil just up to the base of the stem.
Prepare the bougainvillea for wintering inside by pruning it heavily, as much as down to 8 inches tall. The plant will probably drop its leaves when moved indoors, but it will recover in the spring when it is warm enough to place it outside again. Do not move it outdoors until danger of frost has passed for your area. Frost will burn or even kill the bougainvillea.