Step-by-Step Growing Guide
Sweet woodruff (Galium odoratum) is an ideal groundcover for dry or moist shade — one of few herbs that actually thrives under trees where little else will grow. It prefers humus-rich, well-draining soil with a pH of 5.5–7.0, with some moisture retention. Plant in partial to full shade; in deep shade it grows more vigorously than in direct sun where it struggles and scorches. Space plants 30 cm apart; they spread by underground runners to form a weed-suppressing carpet. Water regularly during the first growing season to establish the root system, then the plant becomes largely self-sufficient in shaded conditions where soil moisture is retained. No fertilising is needed in typical woodland-type conditions; a light top-dressing of leaf mould in autumn provides sufficient nutrition. The delicate white star flowers appear in April–May, complementing the whorled, bright green foliage.