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How to Grow Catnip Herb

Leaves of Nepeta cataria

Catnip is an herb that has been attracting cats for more than 2,500 years—and that’s just recorded history. The gray-green foliage when bruised or rubbed releases oil that is irresistible to cats. But catnip is not just for cats; catnip is a member of the mint family and like other mints catmint can be used in the kitchen to flavor salads and teas and on the grill to flavor meats.

Nepeta cataria
Leaves of Nepeta cataria

Get to Know Catnip

  • Botanical name and family: Nepeta cataria is a member of the Lamiaceae—mint family.
  • Type of plant: Catnip is an herbaceous perennial.
  • Growing season: Catnip is a summer grower; plants die back over the winter months.
  • Growing zones: Grow catnip in Zones 3 to 9.
  • Hardiness: Catnips tolerates both cold and heat; catnip is cold hardy to -30°
  • Plant form and size: Catnip grows 15 to 24 inches tall and has an upright, rangy, open growth habit
  • Flowers: Catnip has white to pinkish-purple tubular flowers whorled around the stem.
  • Bloom time: Catnip blooms on and off from mid-spring to fall.
  • Leaves: Catnip has gray-green narrow 2-inch long leaves with toothed margins; the base of each leaf is heart-shaped. Both stems and leaves are covered with downy soft hairs. Stems, like other members of the mint family, are square.

How to Plant Catnip

  • Best location: In northern regions, plant catnip in full sun. In southern regions, plant catnip in partial shade. Start seeds in flats placed in full sun or under fluorescent lights.
  • Soil preparation: Grow catnip in compost-rich, well-drained soil. Add aged compost to the planting bed and turn it under before sowing seed. Catnip will grow in average soil. Catnip prefers a soil pH of 6.6.
  • Seed starting indoors: Sow seed indoors a few weeks before the last spring frost. Germination takes 7 to 10 days. Catnip seeds are very small and so are difficult to handle.
  • Transplanting to the garden: Transplant catnip seedlings to the garden in mid- to late spring. If you bruise the leaves during transplanting, the oil that attracts cats will be released and it will be difficult to keep cats off the plants.
  • Outdoor planting time: Sow catnip seeds in the garden after the last frost in spring and through the summer until about 6 weeks before the first fall frost.
  • Planting depth: Sow seed ¼ inch deep.
  • Spacing: Space catnip plants 10 to 18 inches apart. Thin plants when they are 6 to 8 inches tall.
  • How much to plant: Grow 12 catnip plants for cooking, tea, and preserving.
  • Companion planting: Plant catnip near sorrel, nasturtium, sage, eggplants, and turnips. The aroma of catnip deters flea beetles, ants, spittlebugs, Japanese beetles, and weevils. However, catnip’s underground roots spread rapidly and can crowd out neighboring plants.
Nepeta cataria
Leaves and flowersof Nepeta cataria

How to Grow Catnip

  • Watering: Water catnip just as the soil dries out. Catnip can tolerate dry soil.
  • Feeding: Scratch ½ inch of compost into the top few inches of soil before planting catnip and side-dress plants with aged compost every spring. You can also feed catnip compost tea during the growing season.
  • Pruning: Cut catnip back to the ground in spring to improve its growth and appearance.
  • Care: Cut catnip back to 3 to 4 inches above the ground after flowering; it will grow back within a couple of weeks and begin a new flowering cycle. Plants can become scraggly if not trimmed back.
  • Cats ignore catnip unless the leaves are crushed. Once the leaves are bruised or crushed and the essential oils exposed to the air, cats will roll on catnip plants. Keep catnip safe from cats by enclosing plants in a sturdy chicken-wire cage until well established.
  • Catnip spreads by underground roots; contain plants by surrounding the roots with metal edging.
  • Container growing: Catnip is easy to grow in a container. Choose a container that is at least 6 inches wide and deep. If the container is easily accessible, expect your cat to lie in it often.
  • Winter growing: Catnip can be grown indoors in winter. Protect plants outdoors under a layer of mulch. Remove the mulch after the last freeze in spring.

 How to Harvest Catnip

  • When to harvest: Snip catnip leaves anytime once the plant is 6 inches tall or taller. The flavor of catnip is milder before the plant blooms. If harvesting leaves for your cat, wait until the plant blooms.
  • How to harvest: Snip off individual leaves as needed; the top leaves will be young and tender. Use scissors or snips. When harvesting to dry leaves, cut whole stems complete with their flower stalks about 2 inches from the soil surface.

 Troubleshooting Catnip

  • Pests: Catnip rarely suffers from insect pests, but cats may nibble its leaves and can crush young plants. A spray of catnip and water will deter Colorado potato beetles.
  • Diseases: Catnip can be attacked by fungal diseases including anthracnose and rust. Avoid overhead watering; space plants so that there is plenty of air circulation. Catnip can suffer root rot in wet soil; let the soil dry out between waterings.

How to grow catnip: catnip flowers and stemsCatnip in the Kitchen

  • Flavor and aroma: Catnip smells of camphor, thyme, and pennyroyal. Leaves taste mildly minty.
  • Leaves: Add fresh catnip leaves to salads. Mince leaves to add a mint undertone to sauces and hearty stews. Lemon catnip can be used as a substitute for basil in pesto. Rub meat with catnip leaves before roasting or grilling.
  • Teas: Make a tea from fresh or dried catnip leaves. Catnip has a flavor that is more mellow than peppermint and less sweet than spearmint. Its fragrance is spicy-mint. The catnip cultivar ‘Citriodora’ is lemon-scented for flavorful teas. Tea made from catnip leaves is said to relieve indigestion, colds, and fevers.
  • For cats: Chop the leaves or rub them with your fingers to release essential oils and the scent cats love.

 Preserving and Storing Catnip

  • Drying: Hang leafy stems upside down to air dry. Leaves should dry in 2 to 5 days. Strip leaves and flowers from stems and spread them to dry on a screen in the shade. Leaves also can be dried in a dehydrator.
  • Storing: Store dried catnip leaves in an airtight container.

 Propagating Catnip

  • Seed: Catnip will self-sow in the garden. Seeds will germinate best if they are stratified (exposed freezing temperatures) for a couple of weeks before sowing.
  • Cuttings: Start catnip cuttings in spring. Use 6-inch tip cuttings; dip cut stem ends in rooting hormone and plant in moist potting soil.
  • Layering: New plants can be started by layering branches in the garden. Roots will grow from buried stem nodes.
  • Division: Divide roots every three years in mid-spring or fall.

Catnip Varieties to Grow

  • Another species of Nepeta is mussinii or catmint which grows in soft mounds 1 to 2 feet high with ½ inch lavender-blue flowers on loose pikes at the end of stems.

Also of interest:

How to Grow Basil

How to Grow Rosemary

How to Grow Sage

How to Grow Oregano

How to Grow Mint

How to Start a Herb Garden

Growing Herbs for Cooking

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4 Comments

  1. Thanks for all of the tips! I’m growing catnip in my Aero Garden for my cats and wanted to know how to harvest it. Yes, they totally ignore it even if standing directly next to the plants. The most they do is sniff. I was concerned that they would be gnawing at it before they were a decent size, but nope they aren’t. And let me say, it may take a while for the seeds to germinate but once they start growing they grow like they are on fire.

    Can’t wait to harvest and let the cats go crazy!

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