Catnip plants sprout quickly and are easy to grow for great fun for kids and their cats. Fresh catnip causes a stronger reaction among cats. Catnip was originally native to Europe and Asia and can grow to 3 feet high. If you crush the foliage of this herb, it releases oil that attracts cats. In fact, cats will rub up against the foliage themselves to bruise it and release the scent. Fresh catnip leaves are used in tea, which is said to relieve head colds, and can also be added to salads, stews, and sauces. Catnip is also said to attract good luck. Safe for ages 4 and up. "We pack a lot of eye-catching fun into a small package with our Micro Terrarium Line," noted Alicia Borley, PR manager for DuneCraft. Launch date: February 1, 2008.