How to grow sweet woodruff
Overview
Sweet woodruff (Galium odoratum) is a low-growing, spreading perennial herb in the Rubiaceae family. It is grown for its sweet, hay-like fragrance when dried and for use in drinks, potpourri, and as a groundcover in deep shade. It requires consistent moisture and cool conditions to thrive.
Soil Preparation
Sweet woodruff prefers slightly acidic to neutral soil (pH 5.5–7.0) that is rich in organic matter. Improve heavy clay with compost and coarse sand; ensure good drainage to prevent root rot in wet winters.
Growing Guide
Plant sweet woodruff in a bright, sheltered spot with dappled light, avoiding deep, dry shade. It prefers moist, humus-rich soil and will not tolerate prolonged drought. Space divisions or seedlings 30–40 cm apart; it will fill in quickly. For best results, plant in autumn or early spring in cool and temperate zones, and in late autumn in Mediterranean climates to avoid summer heat stress.
Care
Feed lightly with a balanced liquid fertiliser in early spring and again after the first harvest. Trim back spent flower stems after blooming to encourage fresh growth and prevent self-seeding. Divide clumps every 2–3 years in autumn to maintain vigour.
Companion Planting
Sweet woodruff thrives beneath deep-shade shrubs such as camellias, rhododendrons, and ferns. Avoid planting near aggressive, shallow-rooted trees that compete for moisture, such as silver birch or eucalyptus.
Common Pests & Risks
Sweet woodruff is generally pest-free in Australian gardens. Slugs and snails may occasionally damage new growth in damp conditions; control with iron-based pellets or beer traps.
Harvesting
Harvest leafy stems just as the small white flowers open, when the fragrance is strongest. Cut stems at the base, leaving a few nodes for regrowth. Dry in a dark, airy place to preserve the sweet hay scent.
In the Kitchen
Use fresh or dried sweet woodruff to flavour May wine, cordials, and jellies. The dried herb is also used in potpourri and sachets. Store dried leaves in an airtight jar away from light to retain fragrance.
Troubleshooting
Yellow leaves: often caused by dry soil or too much sun; move to a shadier, moister spot. Brown leaf edges: sign of heat stress or low humidity; increase shade and water. Leggy growth: insufficient light; trim back and ensure dappled sun. Poor spread: soil too dry or compacted; improve with compost.