Bauhinia is a plant genus comprising over 200 species of flowering shrubs and trees that are native to Asia and North America. One species that is particularly popular among gardeners is Bauhinia purpurea. This deciduous tree is commonly known as the purple orchid tree. It grows 30 to 35 feet in height and spreads a similar width. The rather simple green leaves are overshadowed by purple flowers. Its symmetrical round form makes it an ideal shade tree.
There are several things to consider when planting and growing the purple orchid tree. The condition of the soil, the climate, and certain pests or diseases can affect the health of Bauhinia purpurea.
Climate
This tree is suited for hardiness zones 9 to 11. It grows well under direct sunlight and in locations that are partially shaded.
Soil Conditions
The purple orchid tree requires well-draining soil. Compost-rich soil is best, but it will tolerate most types of soil compositions including loamy and sandy soil. This tree can thrive in acidic or slightly alkaline pH.
Watering and Fertilizers
This tree is very tolerant to drought conditions, but it needs regular watering to maintain its lush foliage and flowers. Apply a general purpose fertilizer during the spring to promote flower growth.
Propagation
The best way to propagate this plant is by sowing seeds. This can be done in the fall or spring. Another option is to take stem cuttings and root them in a growing medium.
Pests and Diseases
The leaves and branches of the purple orchid tree are commonly damaged by caterpillars, borers, and mites. This tree is susceptible to fungal infections as well. Brown spots on leaves is a sign of the fungal disease leaf spot.
Reference:
Edward F. Gilman. Bauhinia purpurea – University of Florida IFAS Extension
Purple Orchid Tree – Monrovia