Step-by-Step Growing Guide
Sweet marjoram (Origanum majorana) is a tender perennial grown as an annual in climates with cold winters, requiring full sun and very well-drained, lean soil at pH 6.0–7.5. Unlike its robust cousin oregano, marjoram demands warmth and protection from cold and damp — it is an excellent container herb for this reason. Start seeds indoors 6–8 weeks before last frost at 18–21°C, as seeds are very small and germinate slowly. Surface-sow without covering as they need light to germinate. Transplant 20–30 cm apart outdoors only after all frost risk has passed. Water lightly and allow soil to dry between waterings — marjoram is quite drought-tolerant once established and resents waterlogged roots. Avoid fertilizing with nitrogen-rich products, which dilute the aromatic oils that make marjoram valuable. In mild climates (zones 9–10), marjoram survives as a perennial shrublet; cut back by half in late winter to encourage fresh, aromatic new growth.