If you want a perennial that blooms for months, shrugs off drought and bad soil, and asks for almost nothing in return, catmint (Nepeta) belongs at the front of your border. Its airy spikes of blue-purple flowers float over fuzzy gray-green foliage from late spring well into fall, drawing bees and butterflies in clouds while deer and rabbits walk right past it. It is one of those rare plants that looks soft and cottage-y but performs like a workhorse, and once you learn the single shearing trick that drives its rebloom, it becomes nearly foolproof.
This guide covers everything you need to grow catmint well: where to plant it, how to water and (mostly not) feed it, the cut-back that powers a second flush of color, how to divide and multiply your plants, why pollinators love it, how to use it in the garden, and exactly how it differs from true catnip, including what it will and will not do to your cat.
Catmint is a tough, long-blooming perennial in the mint family
Catmint is a herbaceous perennial in the genus Nepeta, a member of the mint family (Lamiaceae). Like its relatives, it has square stems and aromatic foliage, but it carries itself far more politely than spreading mints. Most garden catmints form neat, billowing mounds of small scalloped leaves in shades of gray-green to silver, topped by upright spikes lined with tiny two-lipped flowers in lavender-blue, violet, pink, or white.
Depending on the variety, plants stand anywhere from 9 inches to 3 feet tall, and they are hardy across a wide range, roughly USDA zones 3 to 8 or 9. Bloom usually begins in late spring or early summer and, with the right care, continues in waves until frost. The foliage is part of the appeal in its own right: brush against it and it releases a clean, minty scent. That same aromatic oil is what makes catmint unpalatable to browsing animals and gives it its faint reputation as an insect repellent in the garden.
The most popular ornamental catmints are sterile hybrids, which matters more than it sounds. Because they set little or no viable seed, they do not self-sow into a weedy mess, they channel their energy into flowering rather than seed production, and they bloom longer and more reliably than seed-grown types. This is the practical reason most gardeners buy nursery plants rather than starting from seed.
Give catmint full sun and sharp drainage and it will thrive on neglect
Catmint’s reputation for being carefree is earned, but it rests on two non-negotiables: sun and drainage.
For the heaviest flowering and the densest, most self-supporting growth, give catmint at least six hours of direct sun a day. In hot southern climates a little afternoon shade is fine and can keep colors from bleaching, but deep shade leads to floppy, sparse, disappointing plants. If your catmint flops open at the center or refuses to bloom, too little light is the first thing to suspect.
Soil is forgiving on every count except wet feet. Catmint grows in rocky, sandy, or clay soils and even in the poor, gritty ground of a hell strip between sidewalk and street, where it will also tolerate road salt. What it cannot survive is soggy, poorly drained soil, which rots the roots, especially over winter. If your ground stays heavy and wet, plant in a raised bed, on a slope, or amend with grit to open it up. Silvery-leaved varieties tend to be the most drought-resistant of all.
Plant in spring after the last frost or in early fall, so roots can settle before summer heat or winter cold. Dig a hole about twice as wide as the root ball and just as deep, loosen any circling roots, set the plant level with the surrounding soil, backfill, and water in. Space plants according to their mature spread, generally 18 to 24 inches (about 30 to 60 cm) apart, so each mound has room to fill out. A thin layer of mulch over the root zone helps new plants establish; keep it pulled back from the crown to avoid trapping moisture against the stems.
Water new plants well, then back off almost entirely
The watering rule for catmint is simple: be attentive the first season, then get out of the way.
During the first growing season, water newly planted catmint regularly so it never dries out completely while it builds a root system. After that, most catmints are genuinely drought tolerant and need little or no supplemental water in cooler or humid regions. In prolonged drought or extreme heat, an occasional deep soak keeps plants looking their best, but routine watering of established plants is usually unnecessary and can do more harm than good.
The one exception is Japanese catmint (Nepeta subsessilis), which prefers consistently moist soil and partial shade. If you grow that species, water it more like a typical perennial regardless of climate.
Skip the fertilizer to keep catmint upright and full of flowers
This is where well-meaning gardeners get catmint wrong. It is adapted to lean soils, and feeding it works against you. Rich conditions and nitrogen fertilizer push soft, leggy growth that flops open at the center and produces fewer flowers, not more.
In practice, catmint needs no fertilizer at all in average soil. If you want to give it anything, a thin annual layer of compost spread over the root zone in fall or spring supplies all the nutrients it will ever ask for. Resist the urge to do more. A plant that is flopping is far more likely to be overfed or underexposed to sun than underfed.
If flopping is a recurring problem despite good light and lean soil, the fix is variety choice rather than care: newer flop-proof selections such as ‘Cat’s Meow’ and ‘Cat’s Pajamas’ were bred to hold strong, upright stems and stay dense without staking or shearing.
The shear-after-first-bloom trick is what powers a second flush
If you do only one thing for your catmint each year, make it this. Catmint blooms heavily in late spring or early summer, then many varieties slip into a midsummer lull as the first flush fades, the stems lengthen, and the plant starts to look tired and open in the middle. Left alone it will often rebloom on its own, but weakly and not for a while.
Shearing resets the whole plant. Once that first flush is clearly past its peak, take hedge shears or sharp pruners and cut the entire mound back hard, by about one-third to one-half. Do not nibble at it stem by stem; treat it like a haircut and shear the whole dome at once down into fresh leafy growth. Within a week or two the plant pushes a flush of clean new foliage, tightens back into a compact mound, and sends up a second wave of flowers that can carry it into fall. In long-season gardens you can repeat a lighter shear after that second flush for yet more bloom.
A few guardrails make the difference between a good shear and a setback:
- Always cut down into leafy growth, not into bare brown wood at the base. Catmint resprouts readily from green stems but is slow and reluctant from old hardened wood, especially late in the year.
- For sterile hybrids you are shearing for shape and rebloom, not to stop seeding, so there is no rush to deadhead individual spent spikes. The whole-plant shear does the job in one pass.
- In the fall, you have a choice. You can cut the dead growth to the ground after it browns, or leave it standing through winter. Leaving it offers cover for overwintering beneficial insects such as ladybugs, and the dried stems give a little structure; in that case, hold off the final cutback until early spring before new shoots emerge. In mild-winter zones some catmints stay semi-evergreen, so wait and cut only what is clearly dead.
Divide catmint every few years to keep it vigorous and to make more plants
Catmint is one of the easiest perennials to divide, and division is both a renovation tool and your best way to multiply plants. As clumps age, the centers can become congested and flowering declines; splitting them every three or four years keeps each plant vigorous and gives you free new plants for the rest of the garden.
Divide in fall or early spring, when the plant is not in active bloom. Lift the whole clump with a spade, then either slice it into sections with the spade or pull the clump apart by hand into pieces, making sure each division carries a good share of roots and several shoot buds. Replant the divisions promptly into refreshed soil, spacing them about a foot apart, and water them in well to settle the soil around the roots.
Seed is the less reliable route for a simple reason: the popular sterile hybrids either do not set viable seed at all or do not come true from it, so seedlings rarely match the parent. Division (or buying named plants) is the dependable way to get the variety you actually want. The non-sterile species, including true catnip, do grow readily from seed, which is part of why they can self-sow and wander.
Catmint is a magnet for pollinators and a wall against deer and rabbits
Few perennials pull double duty this well. The long succession of nectar- and pollen-rich flowers makes catmint one of the best pollinator plants you can grow. Bees of every kind work it from morning to evening, butterflies and other beneficial insects join in, and even the occasional hummingbird visits the tubular florets. A mass planting of catmint will hum with bees all summer with essentially no effort on your part, which makes it ideal for habitat gardens, pollinator borders, and the edges of a vegetable patch where you want more pollinators working your crops.
At the same time, the aromatic, slightly minty foliage that pollinators ignore is exactly what makes catmint deer and rabbit resistant. Browsing mammals dislike the scent and oils and tend to leave it untouched even in gardens where they devour everything else. No plant is guaranteed deer-proof in a truly hungry season, but catmint ranks among the most reliably ignored, which is why it shows up so often in rural and unfenced gardens. As a bonus, the same oils give it a mild reputation for repelling certain garden insects, most often cited against aphids.
Use catmint as edging, a rose companion, and a drought-tolerant filler
Catmint’s loose, soft form and cool flower color make it one of the most versatile design plants in the sunny garden, and it slips into far more roles than its humble look suggests.
- Edging and pathways. Low, spreading varieties are made for the front of a border or the edge of a path, where they spill over and soften hard lines with a long-running haze of blue. This is the classic catmint job.
- The rose companion. Pairing catmint with roses is a time-honored combination. A low catmint planted around the base of rose bushes hides their bare lower canes, echoes and cools the rose color, and gives you flowers down low while the roses bloom up high. Blue catmint flatters reds, pinks, and yellows especially well.
- A lavender substitute. Catmint and lavender share the same soft purple palette and silvery foliage, but catmint is far hardier and more forgiving. In cold climates where lavender struggles, catmint gives a very similar look with none of the fuss.
- Tough, dry sites. Use catmint’s tolerance for poor, dry ground to bring color to problem spots: hot south-facing slopes, the strip beside a driveway or garage wall, gravelly beds, and xeric or fire-wise plantings. Massed on a slope, spreading types even help control erosion.
- Containers and mixed plantings. Trailing and dwarf varieties work as spillers and fillers in pots and window boxes; taller, upright types stand in as a back-of-border anchor or a cut flower.
For partners, lean on plants that share its love of sun and sharp drainage: lavender, salvia, agastache, yarrow, coneflower, black-eyed Susan, Russian sage, sedums, and ornamental grasses all combine beautifully and ask for the same easy care.
Choosing a catmint variety for your space
Catmint comes in enough forms to fit almost any spot. A few of the most useful to know:
- ‘Walker’s Low’ is the longtime favorite, despite the name it is not especially low, forming a substantial mound roughly 2 to 3 feet tall and wide with deep violet-blue flowers. It is also notably less interesting to cats than catnip, a point in its favor near feline company.
- ‘Six Hills Giant’ is the big, vigorous one, a tall blue-mauve mound for the back of a border or for filling space fast.
- ‘Junior Walker’ is a compact, tidy, more upright version of the Walker’s Low look for smaller beds.
- ‘Cat’s Meow’ and ‘Cat’s Pajamas’ are modern, dense, flop-proof selections; ‘Cat’s Pajamas’ is a dwarf with vivid indigo-blue flowers running the full length of the stems, excellent for small spaces, edging, and containers.
- Nepeta racemosa (Persian or dwarf catmint) stays low, around 12 to 18 inches, and spreads into a rounded groundcover.
- Nepeta subsessilis (Japanese catmint) is the outlier, preferring moist soil and part shade rather than hot and dry.
Catmint and catnip are relatives, not the same plant
This is the question that trips up almost everyone, partly because retailers and even plant tags use the names loosely. The clean way to remember it: all catnip is a catmint, but not all catmints are catnip.
Both belong to the genus Nepeta. “Catnip” refers specifically to Nepeta cataria, the herb famous for its effect on cats. “Catmint” is the umbrella term for the broader group of ornamental Nepeta species and hybrids, the plants this guide is mostly about. They are cousins with real, practical differences:
- Looks. Catnip is loose, coarse, and weedy-looking, with grayish-green leaves and small, mostly white (sometimes faintly spotted) flowers. Ornamental catmint is tidier and far showier, with neat mounded growth and abundant lavender to violet-blue blooms.
- Behavior in the garden. Catnip self-sows freely and can become weedy and aggressive. The popular sterile catmint hybrids stay put and are not considered invasive.
- Best use. Catnip earns its keep as an herb, for cats, for herbal tea, and as a folk mosquito repellent, more than as a flower. Catmint is grown for beauty, edging, and pollinators.
If you are trying to tell two unlabeled plants apart, check the flowers first: white means catnip, lavender-purple means an ornamental catmint. Catnip foliage also tends to be a brighter green and the leaves often larger, with longer leaf stalks. And if all else fails, ask a cat.
What catmint and catnip actually do to cats
The famous feline reaction comes from an aromatic compound called nepetalactone, which is chemically similar to certain cat pheromones. When a susceptible cat sniffs it, the plant tends to trigger the wild, rolling, acrobatic response; when eaten, it acts more as a sedative. The effect typically lasts only 10 to 15 minutes before wearing off, and not all cats are wired for it. Kittens are usually unaffected until they are several months old, and roughly half of all adult cats show no interest at all. In normal amounts it is safe, though a cat that gorges on it may get a mildly upset stomach.
Here is the part that matters for your border: ornamental catmints contain some of the same nepetalactone as catnip, but in much lower concentration. That is why most cats react far more strongly to true catnip (Nepeta cataria) than to a garden catmint, and why varieties like ‘Walker’s Low’ are often described as relatively uninteresting to cats. If you specifically want to delight a cat, grow catnip and expect it to be visited, nibbled, and occasionally flattened. If you mainly want a beautiful, long-blooming border plant and would rather the neighborhood cats leave it alone, an ornamental catmint is the safer bet, though a determined cat may still find it.
Plant catmint where it gets sun and good drainage, keep the fertilizer away, shear it once after the first bloom, and divide it every few years, and you will have one of the longest-flowering, lowest-effort, most pollinator-friendly perennials in the garden, blooming blue from late spring until frost.