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Freshly cut grass smells good to us because it releases chemicals, such as jasmonic acid, as a defense mechanism when it is harmed. This scent attracts parasitic wasps and repels caterpillars.
Many people associate the smell of freshly cut grass with carefree summer days. But why does freshly cut grass smell good to us, and where does the smell come from? Scientists have recently studied the phenomenon and discovered that the pleasant smell of freshly cut grass is actually the result of chemicals released by the grass to indicate distress. When plants are harmed, whether by a hungry caterpillar or by lawn mower blades, they emit a distress signal by producing a type of defense protein called jasmonic acid. Not only does this make the plant less attractive to caterpillars, but it also attracts parasitic wasps that lay their eggs inside the caterpillars. In this way the plant ensures its eventual rescue from caterpillars. Interestingly, the same reaction occurs when grass is cut. The scent of freshly cut grass is the result of the plant’s defense mechanism.
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