Caring for Tarragon

Tarragon is a low-maintenance herb once established, requiring minimal intervention throughout the year. Water sparingly, as this plant has low water needs and is prone to root rot in soggy conditions. During dry spells in summer, water deeply but infrequently—once every ten to fourteen days is usually sufficient. In autumn and winter, natural rainfall should provide all the moisture tarragon needs; avoid watering unless the soil becomes bone-dry during prolonged dry periods. Feed tarragon lightly in April as new growth begins. Apply a balanced general-purpose fertiliser or a light dressing of well-rotted compost around the base of the plant. Avoid overfeeding, as too much nitrogen encourages lush but less aromatic foliage. Tarragon grown in reasonably fertile soil often needs no additional feeding at all beyond the initial spring application. Tarragon is fully hardy in zones 5a–9a and will overwinter outdoors without protection in temperate Europe, provided the soil drains well. In very wet winters, consider covering the crown with a cloche or sheet of glass to keep excess moisture off the plant. Mulch with grit rather than organic matter to maintain good drainage around the crown. Pests are rarely a problem, though aphids may occasionally cluster on young shoots in spring; rinse them off with water or squash by hand. Tarragon is more susceptible to fungal issues such as rust or powdery mildew in humid conditions or overcrowded plantings. Ensure good air circulation and avoid overhead watering. Divide congested clumps every three to four years in spring to maintain vigour and prevent the centre from dying out.