Read more: 15 Best Purple Plants For Your Flower Garden The first thing you ... In tropical regions, such as Hawaii, it's commonly used as a cover crop and to improve soil structure.

Shiny leaves and purple flowers led to the plants’ popularity as an ornamental, and the plant spread from its native Madagascar to Hawaii, Australia, the Caribbean, East Africa and India.

It can have blue, white, or violet flowers, but the cultivars with bold purple flowers are especially ... especially in ...