1 Jumbo Bag. Rich, organic soil mix comprised of 95% aged Mushroom Compost (minimum 2 years) and 5% Seaweed. Our Organic Mushroom Compost is a fantastic soil builder, great for keeping soil moist and also helps break down dense clay. Seaweed is a super fertiliser rich in nutrients and minerals, a multi-vitamin for plants. Makes an excellent addition to planting and raised bed mixes as the compost provides organic material to improve water retention and will slowly continue to break down over time. Certified organic. Allow minimum 3 working days for collection or delivery.