Catnip

Catnip (Nepeta cataria) is a bushy perennial herb in the mint family, native to southern and eastern Europe and Central Asia, now widely naturalized across temperate regions. It produces aromatic grey-green foliage and spikes of small white flowers beloved by pollinators. The plant is reliably hardy through Nordic winters, returning vigorously each year and eventually forming dense clumps up to 60 cm tall. It thrives in well-drained soil and a sunny position, tolerating dry spells once established.

Growing

Scarify seeds lightly with sandpaper before sowing to improve germination. Start indoors 8–10 weeks before transplanting out, sowing seeds at 0.3 cm depth in trays; seeds are light-dependent germinators so do not bury deeply. Germination is erratic and can take 1–12 weeks; if no germination occurs after 3–4 weeks, a cold stratification period of 2–4 weeks may be needed. Transplant outdoors once nights stay above 5 °C, spacing plants 25–35 cm apart with 50 cm between rows. Alternatively, direct-sow outdoors as soon as the soil can be worked and has reached at least 10 °C.

Care

Water regularly during establishment; once rooted, catnip tolerates moderate dry periods. Feed with a balanced fertiliser once in early growth if the soil is poor, but avoid over-feeding as it reduces aromatic oil concentration. Cut plants back hard after the first flowering flush to encourage a second flush and to maintain a compact shape. In areas with cats, protect young transplants with wire cloches until plants are large enough to withstand disturbance.

Harvest

Begin harvesting once plants reach at least 20 cm and are in active growth. Cut stems back by up to one-third, taking leafy shoots just above a leaf node. Harvest in the morning after any dew has dried. Leaves are most potent for drying just as flower buds begin to open. Plants will continue producing harvestable material for approximately 90 days through the blooming period.

In the kitchen

Use fresh or dried catnip leaves to brew a mild, slightly minty herbal tea with relaxing properties. In Italian tradition, the leaves pair well with porcini mushrooms sautéed in butter. Young leaves can be added sparingly to salads or used as an aromatic garnish. Dried stems and flowers work as filler material in dried flower arrangements.

Storing

Dry harvested stems in bundles hung upside down in a warm, airy space out of direct light until fully crisp. Strip dried leaves from stems and store in airtight glass jars away from heat and light for up to 12 months. Fresh-cut stems keep in a glass of water at room temperature for several days.