The benefits of vetiver grass and its capacity are evident. Importantly, the grass prevents the collapse of road shoulders on highland areas such as those in Northern Thailand. It has proved to be effective for rehabilitating deteriorated and hard-pan soil as illustrated at the Deteriorated Soil Rehabilitation Project at Khao Cha-ngum in Ratchaburi Province and the Huai Sai Royal Development Study Center in Phetchaburi Province, respectively.