The catnip plant is one of the easiest herbs you can grow, and for anyone who shares a home with a cat, it pays for itself many times over. This rangy, mint-family perennial (Nepeta cataria) shrugs off poor soil, drought, and neglect, comes back year after year in most of the country, and produces the aromatic leaves that send a good share of cats into a happy, rolling stupor. Grow it once and you will have a steady supply of fresh and dried leaves for your cats, a few sprigs for a calming tea, and a flush of small flowers that bees and butterflies work all summer. The plant earns its keep, asks for almost nothing in return, and forgives nearly every beginner mistake.
It is worth being clear about what you are planting before you start, because catnip is regularly confused with the tidy ornamental catmints sold for flower borders. They are close cousins, but they are not the same plant, and only true catnip delivers the full effect on cats. Get the right one in the ground, give it sun and drainage, and the rest is mostly a matter of keeping it from spreading farther than you want.
Catnip Is a Mint-Family Herb, Not the Ornamental Catmint
Catnip belongs to the mint family (Lamiaceae) and carries all the family traits: square stems, paired opposite leaves, and an aromatic, slightly skunky-minty scent that some people compare to a cross between thyme and oregano. The foliage is green to gray-green, triangular to heart-shaped at the base, with coarse teeth along the edges and a soft coating of fine hairs that gives mature plants a grayish, fuzzy look. Native to Europe and Asia, it has naturalized across North America and now turns up wild along roadsides, field edges, and waste ground throughout temperate regions.
This is the point where most gardeners go wrong. In American usage, “catnip” means Nepeta cataria, the weedy herb grown for cats. “Catmint” usually refers to its showier ornamental relatives, especially Nepeta x faassenii and Nepeta racemosa (sometimes sold as N. mussinii), which are bred for flower borders. The differences matter:
- Catnip (Nepeta cataria) has a loose, rangy habit, larger fuzzy leaves, and small clusters of white flowers spotted with pale pink or purple. Its leaves carry the most of the compound that affects cats.
- Ornamental catmint has a compact, mounding habit and showy spikes of lavender-blue or purple flowers that look far better in a border. Its leaves still contain some of the active compound, but at lower levels, so the effect on cats is weaker.
If your goal is to delight a cat or to dry leaves for tea, buy a plant or seed packet labeled Nepeta cataria specifically. If you simply want a pretty, well-behaved purple-flowered perennial for the front of a bed, the ornamental catmints are the better pick. This article is about growing the true herb.
Nepetalactone Is the Compound Behind the Cat Reaction
The reason cats lose their composure around catnip is a volatile oil called nepetalactone, concentrated in the leaves and stems. When a cat smells it, the compound binds to receptors in the nasal tissue and triggers a brief burst of euphoric, playful behavior: rolling, rubbing, head-shaking, drooling, and the occasional zoomies. The effect typically lasts around ten minutes, after which the cat becomes temporarily immune and needs a half-hour or so before it can respond again.
Two details are worth knowing. First, the response is not universal. Sensitivity to catnip is inherited, and only roughly half to two-thirds of cats react at all; kittens and very old cats often show little interest. A cat that ignores catnip is perfectly normal, not defective. Second, smelling and eating produce different responses. Sniffing tends to stimulate and excite, while chewing or eating a small amount tends to have a mild calming, sedative effect. In ordinary amounts catnip is safe and non-addictive, though a cat that gorges on fresh leaves may get a temporarily upset stomach, so there is no harm in letting them self-regulate.
That same nepetalactone does useful work in the garden beyond entertaining cats. It helps repel several common pests, including aphids and squash bugs, and the plant is generally left alone by deer. The nectar-rich flowers, meanwhile, pull in honeybees, bumblebees, lacewings, wasps, flies, and butterflies, making catnip a quiet asset for pollinators and beneficial insects even in a vegetable garden.
Catnip Grows in Full Sun and Almost Any Well-Drained Soil
Catnip is forgiving, but it has clear preferences. Meet these and the plant practically grows itself.
- Light: Full sun gives the best, most compact growth and the most fragrant leaves. It tolerates partial shade and will still grow there, just looser and lankier. In very hot regions, a little afternoon shade during the worst heat is welcome.
- Soil: Average, well-drained soil is all it needs. Catnip actually thrives in lean, poor soils and grows more fragrant in sandy ground. A slightly alkaline to neutral pH (roughly 6.1 to 7.8) suits it well. The one thing it will not tolerate is soggy, waterlogged ground.
- Hardiness: Catnip is a tough perennial across USDA zones 3 through 9, dying back to the ground each winter and resprouting from the roots in early spring. In the coldest zones it survives temperatures well below zero. In the hottest, most humid parts of the Deep South and Southwest it can struggle, and some gardeners there grow it as a cool-season annual or in containers they can move.
- Size: Under good conditions plants reach about 2 to 3 feet tall and wide, sometimes forming small colonies from short underground rhizomes.
Soil fertility and moisture are the main levers on size. Rich, moist soil produces a big, lush, somewhat floppy plant; lean, dry soil produces a smaller, tougher, more aromatic one. For a steady leaf supply, aim for the middle.
Catnip Starts Easily From Seed, Cuttings, or Division
Few herbs are easier to propagate, and you have three reliable routes.
Seed Is the Cheapest Way to Grow a Lot of Catnip
Catnip seed is tiny but vigorous. You can direct sow in the garden after the last spring frost, or in fall in mild-winter areas, lightly covering the seed since it needs only a shallow planting (about a quarter inch). Seedlings usually emerge in roughly seven to ten days in warm soil. Thin or space young plants to 18 to 24 inches apart, since each one will fill out considerably.
There is some disagreement among growers about cold stratification. Catnip germinates readily for many people with no special treatment, especially from fresh seed in warm soil. Older or stubborn seed, however, germinates more reliably after a cold-moist chill that mimics winter. To stratify, mix the seed into a little moistened seed-starting mix, seal it in a zip-top bag, and refrigerate it for a few weeks before sowing. To start indoors, sow stratified seed in trays a few weeks before your last frost, keep the mix lightly moist with a sprayer, and a seedling heat mat will speed things along.
Cuttings and Division Multiply a Plant You Already Have
If you already grow catnip, or a friend does, you can skip seed entirely. Take softwood stem cuttings in late spring or early summer and root them in moist mix. Even simpler, dig an established clump in early spring as it resprouts and divide it at the roots into several pieces, replanting each one. Division also rejuvenates an older, woody plant and is a good way to keep a patch productive.
Young Catnip Plants Need Protection From Cats
There is a well-known catch to growing catnip: the cats that love it can love it to death. Crushing, rolling, and chewing release the scent and draw in your own cats and any roaming neighborhood felines, and a tender young transplant can be flattened or shredded before it ever establishes.
A useful quirk works in your favor. Direct-sown catnip that has never been bruised gives off little scent, so seedlings coming up in place are often ignored until they are larger. It is the act of transplanting, which bruises the foliage and releases the oils, that rings the dinner bell. So if cats are a problem, sowing in place can be easier than setting out starts.
When you do need to shield plants, a few methods work well:
- Push thin bamboo stakes or dowels into the ground every 2 to 3 inches across the plant so a cat cannot lie down or roll on top of it. The stems grow up between them.
- Cover each plant with a low arch or dome of chicken wire. Stems poke through the holes while the crown and roots stay protected.
- Set the plant inside a decorative wire cloche or an old birdcage, or grow it in a hanging basket out of reach.
Once a plant is large and well rooted, it shrugs off most of this attention and bounces back even if a cat occasionally has its way with it.
Established Catnip Needs Very Little Care
This is a low-maintenance herb, and overcare does more harm than neglect.
- Watering: Water young plants regularly until they are established. After that, catnip is genuinely drought tolerant and usually needs no more than your normal rainfall except in extended dry spells. Let the top inch of soil dry between waterings, and never leave it sitting in wet ground.
- Feeding: Catnip is a light feeder. Mixing a few inches of finished compost into the bed at planting is plenty. Heavy feeding mainly produces soft, floppy growth and dilutes the leaf fragrance, so go easy on fertilizer.
- Pinching: Pinch back the growing tips a few times early in the season to encourage a denser, bushier plant and to keep it from getting leggy. This is especially worth doing if you want it to look reasonably tidy.
Cutting Back Keeps Catnip From Flopping and Reseeding
The single most useful maintenance task is cutting back, and it does double duty. As catnip finishes its first flush of bloom, the tall stems tend to flop open and sprawl, and the spent flowers set abundant seed. Shearing the plant hard, even all the way to the ground, right after that first bloom solves both problems at once: it forces fresh, compact new growth, often triggers a second round of flowering, and removes the seed before it can scatter. You can repeat a lighter shearing through the season to keep leaves coming and the plant in shape. In late fall the plant dies back on its own, and you can cut the dead stems any time before spring growth begins.
Controlling Catnip’s Spread Keeps It From Becoming a Nuisance
Catnip earns its “weedy” reputation honestly. It self-seeds freely, and a single unchecked plant can scatter seedlings across a bed and beyond. It also creeps outward from short rhizomes. It is not classed as a true invasive in most regions, but it can certainly make a nuisance of itself if you ignore it.
The fix is straightforward and comes down to not letting it set seed:
- Deadhead spent flowers, or shear the whole plant back after blooming, before seed matures. This is the most important single step.
- Pull up volunteer seedlings while they are small and easy to remove.
- Site it where a little wandering does not matter, or contain it deliberately, which leads to the best control method of all.
Containers Keep Catnip Tidy and Portable
Growing catnip in a pot is the cleanest way to enjoy it without letting it colonize the garden, and it suits indoor cats especially. Choose a roomy container with drainage holes, since the root system expands quickly and will want repotting into a larger pot as it fills out. Use a quality potting mix, set the pot in full sun, water when the top inch dries, and feed lightly if at all.
For indoor cats, the practical trick is to grow several pots and rotate them. Catnip demands a lot of light and will get pale and leggy on a dim windowsill, so cycle pots between a sunny outdoor spot and the house every couple of weeks, bringing in a fresh, recovered plant each time and sending the chewed one back out to bounce back. A pot also keeps the plant off the ground and easier to defend from an over-enthusiastic cat.
Harvesting and Drying Catnip Preserves Its Potency
Catnip is at its strongest when it is in full bloom and setting seed, the stage when nepetalactone levels in the leaves peak, so that is the prime window to harvest the bulk of your crop. For everyday use you can snip leaves and sprigs at any point once the plant is 6 to 8 inches tall and established.
Time the cut for a dry, sunny late morning, after the dew has burned off but while the oils are still high. Depending on how much you want, you can pinch off individual leaves and sprigs, cut out the top third of a mature plant, or harvest whole stems. Always leave at least a third of the plant standing so it can regrow.
Air-drying preserves the scent best:
- Gather stems into small bunches and hang them upside down in a dark, dry, well-ventilated place. Slipping a paper bag loosely over each bunch keeps off dust and catches any leaves that drop.
- For small amounts, a food dehydrator set on low for a few hours works well.
- Once the leaves are crisp and crumble easily, strip them from the stems and store them in an airtight jar in a cool, dark place. Light and air are what fade the potency over time.
Dried catnip goes into refillable cat toys, sachets, and pillows, or gets sprinkled out as an occasional treat. For people, a teaspoon or two of dried leaf steeped in hot water makes a mild, calming herbal tea, and a few fresh young leaves can be torn into a salad. The plant affects humans gently and in the opposite direction from cats, which is why catnip tea has a long reputation as a bedtime drink.
Catnip Has Few Pests but a Couple of Predictable Problems
For a mint relative, catnip is remarkably trouble-free. Its own aromatic oils keep most insects away, and aphids and spider mites rarely bother it outdoors. The realistic problems are these:
- Whiteflies and spider mites on indoor or greenhouse plants. Crowded, stagnant indoor conditions occasionally invite them. Inspect along stems and under leaves, and knock down small outbreaks by hand-removing insects or rinsing the foliage before they multiply.
- Flopping and legginess. Rich soil, too much shade, or too much fertilizer produce soft, sprawling growth. More sun, leaner conditions, pinching, and a hard cut-back after bloom all tighten the plant up.
- Aggressive self-seeding. Covered above, this is the most common complaint and is entirely preventable by deadheading or shearing before seed sets.
- Cat damage. Broken stems from rolling cats are cosmetic on an established plant and rarely fatal; protect only young plants and let mature ones take the abuse.
Plant diseases are uncommon. As with all mints, the surest way to avoid root and stem rot is simply good drainage and restraint with the watering can.
Grown with sun, sharp drainage, and a yearly cut-back, a single catnip plant will reward you for years with fragrant leaves, summer-long pollinator traffic, and a reliable source of feline joy. Buy true Nepeta cataria, give it room or a pot of its own, keep it from going to seed, and protect it while it is young. After that, the hardest part of growing catnip is keeping enough of it for yourself once your cat figures out where it lives.