Bananas do not grow on trees. Rather, they grow from a root structure that produces an above ground stem. The plant is specifically classified as an arborescent (tree-like) perennial herb; in fact, it is the largest herbaceous flowering plant. The banana plant being an herb is that the banana itself is a berry.
Catnip is the common name for a perennial herb of the mint family. The active ingredient in catnip is called nepetalactone which can trigger strange behaviors in cats. Cats don’t actually eat catnip and respond to its taste, but rather, are reacting to the smell. It can be either in a dry or fresh form.