https://www.cabi.org/isc/datasheet/120396
C. nardus is native to southeast Asia and grown commercially in Sri Lanka, India, Burma, Indonesia and Java. It is widely naturalized in tropical Asia and grown as an ornamental in South Florida and southern California (Floridata, 2014). Its native status in Africa is disputed (eMonocot, 2013; USDA-ARS, 2014).
C. nardus invades grazing lands and affects plant species composition, lowering the quality and yield of forage (Ssegawa, 2007). It is unpalatable to cattle and cattle have been known to die of starvation when an abundance of C. nardus, in green condition, was available (Harrington, 1974).
C. nardus is the source of citronella oil, used in perfumery and as an insect repellent. Inexpensive soaps sold in Asian markets are scented with citronella oil. Citronella oil can be mixed with other vegetable oils and used in massage or rubbed on the skin for an insect repellent. Citronella candles and incense, however, are less effective.