The Composting Leaf Sacks are the perfect solution to biodegradable composting. They are a fantastic natural way for collecting leaves and making leaf mould. The leaves rot down into compost known as leaf mould which is a wonderful soil improver and mulch. When left out over the winter the leaf sacks attract worms creating their nutritious worm casts.Full composting sacks placed in flower borders or in vegetable patches over winter will enrich the soil and act as a natural weed suppressant. Composting Sacks are 100% biodegradable. Sack Size: Width 40cm (1ft4″) Height 70cm(2ft3″).