Catnip is native to Eurasia, but is naturalized over much of North America and the world, including my garden(s). During the Middle Ages, catnip was used in the treatment of nervous complaints, for colds, to sooth upset stomachs, and as a sleep aid. Catnip was rubbed on meats before cooking (possibly to disguise the flavor if it had gone off) and the leaves were added to salad. Early colonists took catnip to the New World, and it spread from there. (Image of catnip in our garden)
In The Family Herbal, English botanist John Hill says, “Catmint (another name for catnip) is common about our hedges, but of very great virtues.” He recommends it, “Be gathered just when the flowers are opening, and dried. It is an excellent woman’s medicine; an infusion of it is good against hysteric complaints, vapours, and fits, and it moderately promotes the menses.”In Colonial America: A tea brewed from the leaves was used to treat stomach ache and head colds. Catnip was also steeped in wine and imbibed that way. If a woman wanted to increase her fertility she might soak in a catnip sitz bath. Catnip will take over the garden if you let it, but I like the scent, and the plant, though kind of weedy, is appealing in full flower. Very cheery.
Our cats, particularly our Siamese Tabby Mix, Pavel, love catnip. He rolls in it and chews on the leaves when I sprinkle some on the climbing perch. Even if Pavel is upstairs, he appears in seconds when I get out the catnip. I’m not sure why cats are so besotted by it, just that many are. Though not all. Percy doesn’t care one way or the other. Our kittens, Peaches and Cream, are fans. This summer, daughter Elise and I gathered seeds of various plants to save, including catnip. We put them in an envelope and left it on the counter, only to discover the contents scattered and Pavel’s mouth suspiciously covered with the leaves of catnip that had accompanied the seed gathering. He claimed to know nothing about it, with that innocence felines can conjure. 
One Writer's Way 