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Grow stone Mix This. Soil Aerator Bag, 9ltr Nothing is more important to successful gardening than the aeration of plant roots. Oxygen helps roots absorb nutrients faster and can considerably increase plant growth. Grow stone Mix This is an ideal aeration component. Made from 100% recycled glass and 100% American made, these highly porous aggregates act as 'air pockets' significantly enhancing aeration and drainage of soil, peat, coco coir or compost. Grow stone Mix This eliminates over and under watering, and helps end root rot. Perfect for container gardening or raised beds.