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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 tropical ornamental grass, citronella (Cymbopogon nardus), is the source of commercial citronella oil, used for candles and other insect-repelling products. The fragrant plants can also help keep flies and other insects away from your garden space.lthough there is little scientific evidence to support the practice of using plants as a natural method of repelling pests, many gardeners swear by insect-repellent plants that keep flies and other garden pests away from the outdoor space.