Plant odorants have been present at every stage of biological evolution, interacting with receptors, and initiating events. They bring harmony, balance, and take us away to a different, more connected era. Look at the intellegence in this poem by Sor Juana Ines de la Cruz (1651-1695). Sonnet 147 gives evidence to a very intimate relationship of humans and plants. It has always been this way.
O rose divine, in gentle cultivation
you are, with all your fragrant subtlety,
tuition, purple-hued, to loveliness,
snow-white instruction to the beautiful;
intimation of a human structure,
example of gentility in vain,
in whose one being nature has united
the joyful cradle and the mournful grave;
how haughty in your pomp, presumptuous one.
how proud when you disdain the threat of death,
then, in a swoon and shriveling,
you give a withered vision of a failing self;
and so, with your wise death and foolish life,
in living you deceive, dying you teach!