Catnip is a perennial herb from the mint family Labiatae. It has a square, hairy stalk with typically geen/grey coloured heart shaped leaves that have scalloped edges. Flowers grow in spikes, reaching 1/2 inch in length. It is best known for its ability to get cats high.
There are approximately 250 species of flowering plants in the family Labiatae, some of which include:
Nepeta cataria (catnip or true catnip): White flowers, grows up to 3 feet. This is the variety most cats enjoy.