Dead Mulches for Weed Suppression and Soil Improvement

Weed suppression in organic and low-input horticulture is achieved through dead mulches—straw, hay, wood chips, cover crop residues, or compost—applied to the soil surface. These mulches block light, reduce weed germination, retain moisture, buffer soil temperature, and improve soil structure and organic matter. When matched to crop and soil conditions, they enhance biological activity and support sustainable weed management. Effective application requires optimal depth (5–10 cm), timing, and compatibility with no-till or strip-till systems. Roller crimping enables large-scale in-situ mulch creation. Though material- and labour-intensive, dead mulching reduces reliance on herbicides and external inputs, supports nutrient cycling, and improves long-term soil health.