I'm suprised no one in the potager section has any stories.
I'll go ahead and post one about my very favorite herb:

Why rosemary flowers are Blue.

When Joseph and Mary fled to Egypt, a weary Mary spread her cloak on a white flowered rosemary. The flowers miraculously changed to the blue of MaryÂs cloak. The Spanish name for rosemary is romero, meaning pilgrims plant, and comes from this legend. There is a type of rosemary with white flowers, but the rest bloom in shades of blue.

I have always heard that planting Rosemary near the entrance to a dwelling brings good luck.

I found this is Jessica Houdret's Practical Herb Garden (a great book).

Oregano, or in Latin, Origanum, means "joy of the mountains" from the Greek oros, a mountain, and ganos, brightness or joy.

According to legend, Aphrodite, Greek goddess of love, found this herb in the depths of the ocean and took it to the top of a mountain where it would be close to the sun's rays. Ever since it has been associated with the return of sunshine and warmth, with love and the banishing of sorrow.

thank you, "lavender lass"

This is a great topic, mrtoad :)

I also saw a legend about angelica (same herb book).

According to legend, angelica gets its name from the angel who revealed its virtues to a monk, during a plague epidemic. It was widely thought to give protection from infection, and during the Great Plague of 1664-5, people were told to bite and chew on its roots.

Angelica has anti-inflammatory properties and lowers fevers, aid digestive orders and soothes sunburns, but the book says it should be used with caution.

In European folklore, angelica has an anicent reputation as having powers against witchcraft and evil spirits. In Lapland, poets wore crowns of angelica, supposedly to gain inspiration from its scent :)

I saw a cute story about bleeding heart on the Gardening with Kids forum. I didn't want to retype it all, but it's on the first page, if you want to check it out :)