What's up with the cut grass smell when wet trimming?

Cut Grass Smell

When leaves are cut, enzymes break down fats and phospholipids that are present. This leads to the formation of linolenic and linoleic acids, which are oxidised and subsequently broken down by another enzyme. The breakdown splits the molecule into fragments which contain 6 or 12 carbon atoms. It is these fragments that lead to the ‘cut grass’ smell.  The key aroma compound produced by this process is (Z) - 3 – Hexenal.

The odor threshold for this compound (the amount that needs to be present in order for the human nose to detect it) is a very low .25 parts per billion, which means there doesn’t need to be a lot for the human nose to detect it.  This smell will dissipate over time.

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