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Best Answer: Yes citronella candles work, but their effectiveness decreases with the age. Oil of Citronella is a volatile, liquid oil derived from dried cultivated grasses. It works by repelling animals and insects without harming or killing them. It has a distinctive odour, which repels certain animals..
The oil found in these candles is derived from Citronella Grass (Cymbopogon nardus) , a plant native to southeast Asia and grown commercially in Sri Lanka, India, Burma, Indonesia and Java.Naturalized in tropical Asia, the plant is also grown as an ornamental in south Florida and southern California.he oil found in these candles is derived from Citronella Grass (Cymbopogon nardus) , a plant native to southeast Asia and grown commercially in Sri Lanka, India, Burma, Indonesia and Java.