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I found that, when I smell watermelon aroma outdoors, someone nearby has mowed the grass. Is there an underlying basis?

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I can't say I've ever experienced that, but a cursory Google search indicates this is not unheard of. Also, a weird Harry Potter fanfic. –  Amory Aug 21 '13 at 18:44
    
Are you saying that when grass is mowed, you smell watermelons, or that when you smell watermelons, someone has cut grass near you? –  Atl LED Aug 21 '13 at 19:55
    
I meant that the aroma of the freshly cut grass is like a watermelon smell. –  rook Aug 21 '13 at 20:12

1 Answer 1

up vote 5 down vote accepted

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cis-3-hexenal is probably the main reason. It is one of the main chemicals in fresh-cut grass smell (lots of references besides wiki if you google it). This fairly comprehensive paper on watermelon odorants also says that they find a lot of cis-3-hexenal in fresh cut watermelon. See tables 3.1, 3.2 and 3.3.

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Is this chemical a GLV (Green Leaf Volatiles) –  Remi.b Aug 22 '13 at 6:41
    
i think so, you can see cis-3-hexenal in this reference on the GLV wiki page: olfacts.nl/index_bestanden/Page7.htm –  gchadwick Aug 22 '13 at 6:54

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