Ironwort

Ironwort (Sideritis syriaca) is a perennial mountain herb native to the eastern Mediterranean, traditionally harvested from high-altitude pastures above 1,500 m. It forms low, woolly-leaved shrubs prized for their aromatic, slightly bitter stems and leaves, used widely in herbal tea. In Nordic gardens it thrives in lean, well-drained soil with maximum sun exposure. Its silvery foliage and drought tolerance make it a distinctive and low-maintenance addition to the herb garden.

Growing

Start seeds indoors 8 weeks before transplanting outdoors, once nights stay reliably above 5 °C. Sow seeds on the surface of a light, sandy or well-drained seed compost, pressing them in just 2 mm deep — ironwort needs light for germination. Keep the growing medium at 15 °C; germination takes 14–28 days. Transplant seedlings 30 cm apart into a sunny, sheltered spot with lean, alkaline-friendly, very well-drained soil. Avoid heavy clay and waterlogged conditions.

Care

Water sparingly — ironwort is adapted to dry, stony mountain conditions and will rot in wet soil. Do not feed with nitrogen-rich fertiliser; lean soil encourages the compact, aromatic growth typical of the species. No staking is required. Remove spent flower spikes to encourage a second flush of growth. In Nordic gardens, mulch the crown lightly with gravel or dry straw once soil temperatures fall below 5 °C to aid winter survival.

Harvest

Harvest stems once flowering begins, cutting the top third of each shoot with clean scissors or shears. The plant is at peak aromatic intensity when flowers are just opening. A second lighter harvest can follow after the plant has regenerated. Harvest window spans approximately 30 days from first flower opening.

In the kitchen

Ironwort is the defining ingredient of Greek mountain tea: steep dried stems and flowers in boiling water for 5–10 minutes. Use fresh or dried leaves to flavour olive oil, herbal vinegars, or baked goods. The mild, honey-chamomile aroma pairs well with lemon, honey, and ginger in blended infusions.

Storing

Dry harvested stems by hanging in small bundles in a warm, airy, dark location until fully crisp. Store dried material in an airtight glass jar away from direct light; retains full flavour for up to 18 months. Fresh stems keep for up to one week wrapped loosely in damp paper in the refrigerator.