Aloysia Citrodora is a species of flowering plant in the verbena family Verbenaceae, native to western South America. Common names include lemon verbena and lemon beebrush. It was brought to Europe by the Spanish and the Portuguese in the 17th century and cultivated for its oil.

The botanical name of citronella species is Cymbopogon winterianus and its common name is Java Citronella, belongs to family Graminae. These are the tufted aromatic grasses with superficial fibrous roots. Leaf blades are long, wide, and glabrous. Spathate panicles decompound, large, long with many racemes. Spikelets are sessile and long.

Eucalyptus globulus, the Tasmanian bluegum, southern blue-gum or blue gum, is an evergreen tree, one of the most widely cultivated trees native to Australia. They typically grow from 30–55 m (98– 180 ft) tall. The tallest currently known specimen in Tasmania is 90.7 m (298 ft) tall.

Lemongrass (Cymbopogon) is a tall perennial plant from the Poaceae grass family, which thrives in tropical and subtropical regions, such as in India, Cambodia, Malaysia, Indonesia, Sri Lanka, China, and Guatemala. This plant grows in dense clumps and has bright-green, sharp-edged leaves, similar to grass.

Palmarosa is a tall perennial grass which contains a sweet smelling oil of rose like odour. It is a tropical plant and grows in warm humid areas and is used in perfumery, food flavouring and medicinal pharmaceutical industry. The oil is a very rich source of high grade geraniol (75- 90%) and the crop is regarded as the cheap source of geraniol.

This Brazilian evergreen tree can grow up to 40 meters (125 feet) high and has a reddish bark and yellow flowers and is extensively felled in the South American rainforest, but now legislation requires distilleries to plant a new tree.