Bougainvillea plants (Bougainvillea glabra) grow outdoors in U.S. Department of Agriculture plant hardiness zones 9 to 10. This tropical vine is not frost hardy so it is grown as a houseplant in cool climates. Bougainvillea produces an abundance of blossoms in the proper dirt.
Bougainvillea vines grow in nearly any type of soil mixture. This plant prefers fertile, loose soil, but will tolerate clay or sandy soil.
The best dirt for bougainvillea plants drains well. Soil that stays wet will cause the bougainvillea vines to rot at the roots.
The best soil for bougainvillea plants is slightly acidic with a pH level between 5.5 and 6. Do not change the soil acidity level without testing the pH level first. Soil that is too alkaline will kill the bougainvillea plant.
Use a soilless mixture when growing this tropical plant in a container. Create a mixture of 4 parts well-rotted pine bark, 3 parts peat moss and 2 parts perlite. Plant the bougainvillea in a clay container, which quickly wicks the moisture away from the roots.