How to grow mugwort
Overview
Mugwort (Artemisia vulgaris) is a vigorous, aromatic herbaceous perennial grown for its silver-backed, deeply lobed foliage and its use in traditional medicine and companion planting. It spreads readily by rhizomes and can become invasive if not managed.
Soil Preparation
Mugwort prefers a well-drained, moderately fertile soil with a pH between 6.0 and 7.5. It will tolerate poor, sandy, or clay soils but performs best with added compost. Avoid waterlogged conditions, as this can lead to root rot.
Growing Guide
Plant mugwort in full sun in a free-draining, moderately fertile soil. Space plants 60–90 cm apart to allow for their spreading habit. It is best planted from divisions or cuttings in spring or autumn; direct sowing is less reliable. Once established, it will tolerate poor soils and dry conditions, but performs best with occasional deep watering during extended dry spells.
Care
Feed lightly with a balanced organic fertiliser in early spring. Cut back hard after flowering to control spread and encourage fresh growth. Divide clumps every 2–3 years to maintain vigour and prevent the plant from becoming too woody.
Companion Planting
Mugwort is a good companion for brassicas, carrots, and onions, as its strong scent can help deter some pests. Avoid planting near fennel or other Artemisia species, as they may cross-pollinate and reduce vigour. It can also be used as a dynamic accumulator in a permaculture system.
Common Pests & Risks
Mugwort is generally pest-free, but can occasionally attract aphids or spider mites in hot, dry weather. Slugs and snails may damage young shoots in spring. Control with a strong water spray or insecticidal soap; avoid overwatering to reduce fungal issues.
Harvesting
Harvest the topmost sprigs and leaves just before the plant flowers, when the essential oil content is highest. Cut stems in the morning after the dew has dried. For best flavour and aroma, use fresh or dry in a well-ventilated, shady spot.
Troubleshooting
Yellow leaves: overwatering or poor drainage; reduce watering and improve soil. Brown leaf edges: windburn or salt stress; protect from strong winds and avoid over-fertilising. Stunted growth: poor soil or root competition; divide and replant in fresh soil. Powdery mildew: poor air circulation; space plants further apart and avoid overhead watering. Invasive spread: lack of regular division; cut back hard and remove runners.