Outsidepride Lemon Catnip Herb Plant Seeds - 5000 seeds Lemon catnip grows as a perennial herb in USDA zones 3 - 8. Nepeta cataria gets blue flowers and only reaches 18 inches in height. Lemon catnip plants are a bit smaller than common catnip and the foliage is a soft green rather than gray/green. Your cats will love it! It is great in teas and has beautiful blue blooms in summer which attract honeybees. Sow 2 - 3 of these heirloom, non gmo seeds for every plant you want in your herb garden.