Crocus

Yet mark’d I where the bolt of Cupid fell:

It fell upon a little western flower,

Before milk-white, now purple with love’s wound,

And maidens call it love-in-idleness.

A Midsummer Night’s Dream

Saffron was grown mainly as a dye for fabric but also had myriad medicinal applications. The Viagra of the day, housewife’s manuals recommend it both as aphrodisiac “To cause standing of the yard” and on the next page as a remedy “To prevent the standing of the yard.”