How to grow catnip
Family Lamiaceae. Hardy to USDA hardiness zone 3a+ (U.S. Department of Agriculture). Full sun to part shade. Ready in 60-90 days (perennial).
Sun
Full sun to part shade
Spacing
18-24 in
Days to harvest
60-90 days (perennial)
Hardiness
Zone 3a+
What growers actually recorded
Loading zone 7b results…
When to plant catnip
- Start indoors: ~8 weeks before last frost.
- Transplant out: ~2 weeks after last frost.
Companion plants for catnip
Plant with: Squash, Cucumber.
Avoid near: Anywhere neighborhood cats will trample nearby seedlings.
Common pests & problems
Rarely bothered; the plant itself is a known deterrent to flea beetle and squash bug in field trials.
Feeding & fertilizer
N-P-K ratio: Low fertilizer: herbs go bland when overfed
Organic options: Compost once at planting · Weak fish emulsion once mid-season if pale · Nothing after that
When to feed: Feed lightly if at all. Mediterranean herbs (rosemary, thyme, oregano) thrive in lean soil.
Watch for: Fast, floppy, weak-flavored growth = too rich.
N = nitrogen (leaves), P = phosphorus (roots and flowers), K = potassium (fruit and disease resistance). How to read a fertilizer label →
Grower's tip
Fence it off if cats roam the neighborhood: they'll flatten the plant and any seedlings around it rolling in the scent.
When to plant catnip in your zone
Free month-by-month sowing and transplanting lists, built from frost dates for your USDA (United States Department of Agriculture) hardiness zone.
Soil & water for catnip
Soil & pH
6.0-7.5
Well-drained, on the lean side. Mediterranean herbs rot in rich wet soil.
Compost once at planting, then leave the bed alone. Add grit or perlite for rosemary and thyme.
Watering
0.5-1 in / week
Base watering; catnip is drought-tolerant once established, similar to other Lamiaceae herbs.
Let soil dry between waterings; catnip tolerates neglect well.
Knowing when to harvest
- Cut stems for drying just as the plant begins to flower, when the essential oil (nepetalactone) content is highest.
- Harvest in the morning after dew dries for the best oil concentration.
Storing & keeping
Air-dry bundled stems in a dark, airy spot; store dried leaf in a sealed jar or bag out of light for up to a year, though potency for cat enrichment fades gradually. Freezing dried catnip preserves potency longer than room-temperature storage.
What to expect
Per plant: Several ounces of dried leaf per plant per cutting from an established clump
Troubleshooting catnip
Catnip has spread well beyond its original bed
Likely cause: Catnip self-sows heavily and can spread by root as well; it behaves as a mildly invasive plant in many regions
What to do: Deadhead spent flowers before seed sets, or contain the planting in a buried pot or dedicated bed.
Plant is repeatedly flattened or chewed to the ground
Likely cause: Cats are drawn to catnip's scent and will roll on, chew, and crush plants
What to do: Protect young plants with a wire cage or cloche until established; mature plants recover from cat damage more easily.
Varieties worth growing
Common catnip (Nepeta cataria, seed-grown standard)
The species grown specifically for its strong nepetalactone content that attracts cats.
Growing catnip in containers
Grows well in a container, which also helps limit its tendency to self-sow and spread through a garden bed.
Nutrition
Volatile oils that hold up after drying: rosmarinic acid in rosemary, thymol in thyme, menthol in mint, eugenol in basil and oregano. That's why a pinch of dried herb often tastes stronger than a handful of fresh. The oils are concentrated once the water leaves.
Common questions
Is catnip invasive?
It self-sows readily and spreads by root in favorable conditions; it is not federally regulated as noxious in most areas, but many gardeners contain it in pots for the same reasons they contain mint.
Why do my cats destroy the plant?
Cats respond to nepetalactone by rolling, rubbing, and chewing the foliage, which often crushes or kills small plants; protect young plants with a cage until they're established enough to tolerate the attention.
Where these numbers come from
- USDA Plant Hardiness Zone Map (2023 revision). Zone assignment and the 30-year normals behind every cold-hardiness figure.
- NOAA NCEI 1991-2020 Climate Normals. Frost dates, growing-season length, and the probability bands on both.
- Cornell, UMN, and UC Davis Cooperative Extension crop guides. Spacing, days to maturity, soil pH targets, and per-plant yield ranges.
- USDA FSIS / FDA Produce Safety guidance. Wash, cure, and cold-storage handling numbers.
Ranges are regional guidance, not a promise for your yard. Your own logged results always override the published range.