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Catnip is an easy-to-grow perennial grown primarily for its fragrant foliage that is extremely attractive to cats. A vigorous herb, catnip can be grown indoors on a sunny windowsill or in a bright location outdoors. As with many mints, it can become invasive. Plant it in a location where it is easily controlled. And remove the flower heads before they mature and set seeds. Harvest catnip leaves at any time as a treat for your favorite feline. You also can dry the leaves and stuff them into kitty toys. The aromatic foliage also repels mosquitoes.