Why does freshly cut grass smell so strong?

When grass blades are damaged, enzymes quickly convert fatty acids in the cell membranes into a family of small molecules called green leaf volatiles (GLVs). These chemicals, mainly aldehydes and alcohols with six carbon atoms, evaporate readily and produce the characteristic fresh-cut-grass scent. In nature, GLVs serve as distress signals: they can attract predatory insects that eat the herbivores attacking the plant and may also warn neighbouring plants to boost their own defences. Humans perceive the smell as pleasant, and it is sometimes used in perfumes and candles.