Herb · Lamiaceae
Catnip
Nepeta cataria
Hand it full sun and lean, dry soil and catnip takes off on its own, while your cat throws the party.
Full sun
Every 7–14 days
59–86°F · 15–30°C
USDA 3–9
Overview
Catnip is a tough, fast-growing perennial in the mint family that rewards every gardener who plants it, with soft gray-green leaves and small white flowers flecked in purple. It sprang from Eurasia and has since spread across much of the temperate world, taking off just as readily in a garden bed as in a pot. Hardy from zones 3 to 9, it powers through cold winters and dry summers without missing a step.
The name traces to nepetalactone, the aromatic oil packed into the leaves that tips many cats into a giddy whirl of rolling and rubbing. People have prized it for ages too, plucking the leaves for a mild herbal tea. On top of that it pulls in bees and other pollinators while quietly driving off a few garden pests.
Few plants make growing feel this effortless. Catnip wants sun, sharp drainage, and barely anything more, and it actually thrives on neglect, since rich soil and heavy feeding only flop it over. The single catch is its drive to spread, so most of the fun comes down to steering it where you want it.
Care
The short version: full sun, lean and well-drained soil, and a deep drink only once the top half has dried out. Shear it after bloom, feed it lightly, and pen it in if you would rather it not self-seed across the whole garden.
Light
Catnip craves full sun for the sturdiest plants and the punchiest aroma. It scrapes by in part shade, but skimp on light and it stretches leggy and floppy with a weaker scent, so hand it the brightest spot going.
Water
Once it digs in, catnip turns drought-tolerant and far happier dry than wet. Water it deeply but only every 7 to 14 days, letting the top half of the soil dry out first. Soggy ground rots it, and a wet winter bed can finish it off, so when in doubt, hold back.
Soil
Drop it into average, well-drained loamy or sandy soil and skip fussing over fertility, since it powers through poor, dry ground without a grumble. Any pH from 6.0 to 7.5 suits it. Sharp drainage is the one thing it flat-out demands.
Temperature
Catnip romps across a wide range, roughly 59°F to 86°F (15°C to 30°C). It rides out winter cold in zones 3 to 9 and shrugs off summer heat without slowing down.
Humidity
Plain air does the job, somewhere around 30% to 60%, so there is nothing to tinker with. What really counts is airflow, because stagnant, crowded conditions roll out the welcome mat for powdery mildew on the leaves.
Feeding
Go light at feeding time, since catnip wants only a small dose of balanced fertilizer or compost in spring, if anything. Pour it on and you trade the aroma and a tidy shape for soft, floppy growth.
Pruning
Once the first flush of bloom fades, shear the plant back by one-third to one-half to spark a rebloom, keep it compact, and slow the self-seeding. Then in late fall or early spring, cut the spent stems clean to the ground.
Repotting
Lift and divide clumps every 2 to 3 years to keep them charging, and repot container plants in spring. Roots circling the pot, smaller leaves, water firing straight through, and a woody, crowded center all wave the flag that it is time.
Size & spacing
Catnip bulks into a rounded clump about 24 to 35 inches (60 to 90 cm) tall and nearly as wide. Hand each plant that much room so air whips through freely and mildew stays shut out.
When to plant
Catnip charges off the spring frost, the same as most garden herbs. Kick seed off indoors in late winter, push the plants outside once the cold lifts in mid to late spring, and the flowers light up from late spring through summer. Snatch the leaves right as the buds form for the boldest aroma.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: 6-8 weeks before the last spring frost
- Plant: After the last spring frost, in mid to late spring
- Harvest: White-to-pale-lavender, purple-spotted flowers from late spring through summer; harvest leaves just before or at flowering for peak aroma
Hardiness
USDA hardiness zones: 3–9
Temperature: down to -40°C
Troubleshooting
Catnip throws very few real problems your way, and most of what crops up is purely cosmetic. The usual lineup is cats roughing up the stems, a flop once flowering wraps, and seedlings springing up where nothing was sown. Spot the match below and the fix is usually a quick one.
Volunteer seedlings popping up all over the bed
Catnip is a runaway self-seeder that doubles down by creeping outward on short rhizomes into colonies. Get ahead of it by shearing or deadheading before the seeds set, and twist out the volunteers while they are tiny and lift with ease. Want it firmly reined in? Grow it in a container and call it done.
Fix:
- Deadhead or shear before seed set
- Pull or hoe volunteer seedlings while young
- Grow in a container to contain spread
Stems crushed flat and the clump matted down
Nine times out of ten this is just cat damage, the happy price of growing the plant cats adore. Nepetalactone pulls them in to roll, rub, and chew, and a hard rain or gust piles on by pressing the soft stems flat. Slip a cage over a young or prized plant until it bulks up woody, and plant a few throwaway clumps the cats can flatten to their hearts' content.
Fix:
- Protect young or prized plants with a wire cloche or low cage
- Plant extra clumps so cats can use some freely
- Stake or surround floppy stems for support
Leaves yellowing, stippled, or dusted with white
Three sneaky look-alikes crowd into this one. Aphids kink the new growth, spider mites fleck the leaves when the air turns hot and dry, and powdery mildew throws a white film over plants jammed too close. Blast the pests off with a punchy jet of water, hit the holdouts with insecticidal soap, and open the planting up so air rushes through and lifts the mildew.
Fix:
- Hose off pests with a strong jet of water
- Apply insecticidal soap or horticultural oil for aphids and mites
- Improve spacing and airflow and remove affected foliage for mildew
Plant gone leggy and flopping open after bloom
This is the plant's natural post-bloom slump, and shade or rich soil shoves it along by forcing weak, soft growth. Grab the shears the moment the first flush fades, cut back by a third to a half, and watch it spring into a tighter mound that often blooms all over again. Park it in full sun, keep the soil lean, and resist the urge to feed.
Fix:
- Shear the plant back by one-third to one-half after the first bloom
- Move container plants into full sun
- Reduce fertilizer
Toxicity
Catnip is safe all around, so plant it with confidence. It packs no real toxin, which means cats, dogs, horses, rabbits, livestock, birds, and people can all share its space worry-free. Cats just ride the nepetalactone through a harmless few minutes of euphoria, and for people the leaves brew into a gentle tea.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
This is the headline act, and it is completely safe. Nepetalactone fires off a quick, harmless buzz, so a cat rolls, rubs, licks, and shakes its head for about 10 minutes before strolling off to do something else. Let one plow through a giant pile of leaves and the worst on offer is a bit of passing vomiting or loose stool.
Dogs None
Dogs breeze right past catnip. Most never glance at it, and a quick nibble does nothing at all.
Horses None
A horse can graze catnip with zero trouble. It is a mint-family herb, and no toxin lurks in it.
Rabbits None
Rabbits handle catnip fine in the little amounts they would ever eat. Just dodge a sudden big helping, the same as with any fresh green.
Livestock None
Cattle, goats, and sheep can browse catnip safely. Nothing in it carries a poison to harm them.
Birds None
Pet and backyard birds stay perfectly safe around catnip, and plenty ignore it outright. The leaves pack nothing that could hurt them.
People None
Catnip has long earned its keep as a kitchen and tea herb for people, steeping into a mild, pleasant cup. Handle the leaves and drink them freely, since the scent does nothing to people the way it electrifies a cat.
Smelling or eating catnip causes a temporary euphoric response in many cats (rolling, rubbing, head-shaking, drooling, vocalizing) lasting roughly 10 minutes, after which the cat loses interest; this behavioral effect is harmless, while eating very large amounts may cause mild, transient vomiting or diarrhea. The aroma is harmless to people.
Helpline numbers
United States
ASPCA Animal Poison Control: (888) 426-4435 (fee applies)
United Kingdom
Animal PoisonLine: 01202 509000 (fee applies)
Australia
Animal Poisons Helpline: 1300 869 738
Varieties
Most gardens run with plain catnip, but one named form is well worth chasing down.
Nepeta cataria 'Citriodora'
Lemon catnip fires off a zesty lemon scent stacked right on top of the usual minty catnip aroma.
How to propagate
Catnip multiplies in a flash. Launch it from seed, split an old clump, or root a cutting, and half the time it beats you to it by seeding itself.
SeedEasy
Sow indoors 6-8 weeks before the last frost, or direct sow in spring · 10-20 days to germinate; harvestable within the first season
Seed is the go-to launch. Fire it off indoors 6 to 8 weeks before your last frost, or scatter it straight outside in spring, and it bursts up in 10 to 20 days with leaves to harvest that very first season. Once it digs in, catnip seeds itself with gusto, usually well past what you planned.
DivisionEasy
Spring or early fall · 2-4 weeks to re-establish
Dig up a settled clump in spring or early fall, split it, and you revive a tired plant while banking free new ones in the same move. Each chunk grabs hold again within 2 to 4 weeks. Run through this every few years and the center never goes woody and bare.
Stem cuttingsModerate
Late spring to summer, from non-flowering shoots · 2-3 weeks to root
Snip softwood cuttings from non-flowering shoots through late spring and summer. Sink them into a moist, well-drained mix under high humidity and they root in 2 to 3 weeks. It takes a bit more finesse than seed or division, so it earns the top spot for trickiness among the three.
Myths
Catnip is a dangerous, addictive drug that gets cats high.
Not a chance, because nepetalactone only triggers a quick behavioral response, not a real high, and nothing about it hooks a cat. The effect fades in about 10 minutes, and the cat then shrugs it off for a while before it can fire up again.
Every cat goes wild for catnip.
Not every cat joins the party, since the reaction is inherited and only about half to two-thirds of cats respond at all. Kittens under roughly 3 months and a solid share of grown cats stay completely unmoved.