Herb · Lamiaceae
Catnip
Nepeta cataria
Hand it full sun and lean, dry soil and catnip pretty much takes care of itself, while your cat handles the party.
Full sun
Every 7–14 days
59–86°F · 15–30°C
USDA 3–9
Overview
So what's catnip? It's a tough, fast-growing perennial in the mint family, with soft gray-green leaves and little white flowers flecked with purple. It started out in Eurasia and has since made itself at home across most of the temperate world, and it'll grow just as happily in a garden bed as in a pot. Hardy from zones 3 to 9, it handles cold winters and dry summers without blinking.
The name comes from nepetalactone, the scented oil in the leaves that sends a lot of cats into a quick, happy roll-and-rub frenzy. People have always liked it too, picking the leaves for a mild herbal tea. On top of that, it pulls in bees and other pollinators while quietly keeping a few garden pests away.
Honestly, catnip is about as easy as it gets. It wants sun, good drainage, and not much else, and here's the funny part: it does worse with kindness than neglect, since rich soil and heavy feeding just make it flop. The one real headache is how fast it spreads, so most of the work is just keeping it where you want it.
Care
The short version: full sun, lean, well-drained soil, and a deep drink only once the top half has dried out. Shear it after it blooms, go easy on the feeding, and pen it in if you don't want it self-seeding all over the place.
Light
Catnip really wants full sun for the sturdiest plants and the best scent. It'll put up with part shade, but too little light leaves it leggy and floppy with a weaker smell, so give it the brightest spot you've got.
Water
Once it's established, catnip is drought-tolerant and way happier dry than wet. Water it deeply but only every 7 to 14 days, and let the top half of the soil dry out first. Soggy ground rots it, and wet soil over winter can finish it off, so when in doubt, hold off.
Soil
Stick it in average, well-drained loamy or sandy soil and don't sweat the fertility, since it shrugs off poor, dry ground. Any pH from 6.0 to 7.5 works fine. The one thing it really can't do without is sharp drainage.
Temperature
Catnip does well across a big range, roughly 59°F to 86°F (15°C to 30°C). It's cold-hardy right through winter in zones 3 to 9, and summer heat doesn't faze it at all.
Humidity
Plain old air suits it, somewhere around 30% to 60%, so there's nothing to fuss with. What matters way more is airflow, because stuffy, crowded conditions are an open invite for powdery mildew on the leaves.
Feeding
Go light here, since catnip only wants a small dose of balanced fertilizer or compost in spring, if anything at all. Pile it on and you'll trade the scent and a nice tidy shape for soft, floppy growth.
Pruning
After the first round of bloom, shear the plant back by one-third to one-half to nudge a rebloom, keep it compact, and cut down on self-seeding. Then in late fall or early spring, cut the spent stems right down to the ground.
Repotting
Lift and divide clumps every 2 to 3 years to keep them going strong, and repot any container plants in spring. Roots circling the pot, smaller leaves, water shooting straight through, and a woody, crowded center are all telling you it's time.
Size & spacing
Catnip fills out into a rounded clump about 24 to 35 inches (60 to 90 cm) tall and roughly as wide. Give each plant that much elbow room so air can move and mildew stays away.
When to plant
Catnip runs on the spring frost, just like most garden herbs. Start seed indoors in late winter, set plants out once the cold's gone in mid to late spring, and the flowers show up from late spring through summer. Want the strongest scent? Pick the leaves right as the buds form.
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 hardly ever causes real headaches, and most of what goes wrong is just cosmetic. The usual stuff is cats trashing the stems, a flop after flowering, and seedlings turning up where you never planted them. Find what matches below and the fix is usually quick.
Volunteer seedlings popping up all over the bed
Seeing babies everywhere? That's catnip being a big self-seeder, and it spreads sideways on short rhizomes into little colonies on top of that. Cut or shear it before the seeds set, and yank the volunteers while they're small and pull out easily. And if you'd rather it just stay put, grow it in a pot.
Fix:
- Deadhead or shear before seed set
- Pull or hoe volunteer seedlings while young
- Grow in a container to contain spread
Stems flattened and the whole clump matted down
Wondering what squashed it? It's almost always just cat damage. The nepetalactone reels cats in to roll, rub, and chew, and a downpour or strong wind can press those soft stems down too. So pop a little cage over a young or favorite plant till it's big and woody, and tuck in a few extra clumps the cats can flatten all they like.
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
A few different things can look the same here. Aphids twist up the new growth, spider mites stipple the leaves when it's hot and dry, and powdery mildew lays a white film over plants that are packed in tight with no air moving. A hard blast of water knocks the bugs off, insecticidal soap takes care of the holdouts, and opening things up for airflow clears 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 one's just the normal slump after flowering, and too much shade or overly rich soil makes it worse by pushing weak, soft growth. The fix is easy: once the first round of flowers fades, shear the plant back by a third to a half and it tightens up, usually with a fresh bloom to follow. Keep it in full sun on lean soil and don't overdo the feeding.
Fix:
- Shear the plant back by one-third to one-half after the first bloom
- Move container plants into full sun
- Reduce fertilizer
Toxicity
Good news, catnip is safe all around. There's no real toxin in it, so cats, dogs, horses, rabbits, livestock, birds, and people can all hang around it without any worry. Cats just react to the nepetalactone with a harmless few minutes of bliss, and for you the leaves make a nice, gentle tea.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
Here's the fun part, and yes, it's safe. The nepetalactone kicks off a quick, harmless buzz, so a cat will roll, rub, lick, and shake its head for about 10 minutes and then just walk away. The only catch? If one scarfs down a big pile of leaves, you might see a bit of passing vomiting or loose stool, and that's it.
Dogs None
Dogs couldn't care less about catnip. Most don't even notice it, and a nibble won't do a thing.
Horses None
A horse can munch catnip no problem. It's just a mint-family herb, and there's no toxin in it.
Rabbits None
Rabbits are fine with catnip in the little amounts they'd actually eat. Same rule as any fresh green though, skip the sudden big helping.
Livestock None
Cattle, goats, and sheep can browse catnip without any worry. There's nothing in it that'll poison them.
Birds None
Pet and backyard birds are perfectly okay around catnip, and plenty of them just ignore it. Nothing in the leaves can hurt them.
People None
For people, catnip's an old kitchen and tea herb that makes a mild, pleasant cup. You can handle the leaves and drink it just fine, and the smell does nothing to you the way it does to 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 folks grow plain catnip, but there's one named version worth a mention.
Nepeta cataria 'Citriodora'
Lemon catnip throws a bright lemon scent on top of the usual minty catnip smell.
How to propagate
Catnip's a breeze to multiply. You can grow it from seed, split an old clump, or root a cutting, and a lot of the time it just saves you the trouble and seeds 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's the usual way to go. Start it indoors 6 to 8 weeks before your last frost, or just scatter it outside in spring, and it'll come up in 10 to 20 days with leaves ready to pick that same first season. After it settles in, catnip pretty much sows itself, often more than you asked for.
DivisionEasy
Spring or early fall · 2-4 weeks to re-establish
Dig up an old clump in spring or early fall, split it, and you've freshened a tired plant and got free new ones in one go. Each piece settles back in within 2 to 4 weeks. Do it every few years and the middle won't go woody and bare on you.
Stem cuttingsModerate
Late spring to summer, from non-flowering shoots · 2-3 weeks to root
Snip softwood cuttings off shoots that aren't flowering, late spring into summer. Pop them in a moist, well-drained mix with plenty of humidity and they'll root in 2 to 3 weeks. It's a bit more hands-on than seed or division, so it's the fiddliest of the three.
Myths
Catnip is a dangerous, addictive drug that gets cats high.
Nope, the nepetalactone just sets off a quick behavioral response, not a real high, and there's nothing addictive about it. The effect fades in about 10 minutes, and then a cat goes immune to it for a while before it'll work again.
Every cat goes wild for catnip.
Not quite, since the reaction is inherited and only about half to two-thirds of cats respond at all. Kittens under roughly 3 months and a good chunk of grown cats just feel nothing, so don't take it personally if yours shrugs.