Water young plants twice a week for the first two weeks, reduce watering to every other week after plants become well established. The plant is drought tolerant and can resist heat as it grows older. During the dry catnip season and high temperatures, increase watering to once a week or even more if needed.Click to see full answer. Regarding this, does catnip need a lot of water?Water: Catnip likes a steady supply of water, but good drainage is a must. The plant recovers quickly from a wilt, so it’s best to err on the side of dry rather than too wet, which will encourage root rot. Soil: Any good, fast-draining potting soil will likely do.Secondly, does catnip need direct sunlight? Catnip herb grows best in well draining soil in the full sun, but will tolerate part sun and a wide variety of soil types. Once catnip plants are established, they need very little in the way of care. Also to know is, is catnip easy to grow? Catnip is a common herb that thrives in much of North America and is very easy to grow. Catnip grows to a height of three or four feet and has featherlike, light green foliage and small clusters of lavender flowers that grow on spikes. A member of the mint family, catnip is also used in food and herbal remedies.How do you keep catnip alive? Plant in full sun, unless you live in a hot, dry location. Catnip grows best outdoors, but can be grown indoors if you place it by a window that gets at least six hours of full sun per day. If growing a plant indoors, you should place it no more than three feet away from the sunlit window.