Preventative Plant Protection.
Using mulch made of mussel shells offers a range of advantages: once it has been spread on the bed, they continue to do their work for years because they are mineral in substance and aren't prone to be broken down by microorganisms and reduced to humus. Therefore it's a good idea to provide the humus feeding shrubs with a supply of compost before spreading the shells. The shells contain no weed seeds, won't bind with nitrogen like bark does and won't support the growth of fungus like wood chips do. In addition, the light coloured mussel shells reflect light in the dark winter months to the benefit of the winter and evergreen plants in the garden. That includes certain herbs like rosemary, thyme or savoury. After a shower of rain, the surfaces of the shells dry off quickly, which helps to prevent the formation of fungus on the root crown of the plants. Meanwhile, beneath it, a crumbly, well ventilated and teeming soil will develop. Snails tend to avoid the dry, sharp-edged shells but since their presence is dependent on many other factors, we can't guarantee their confirmed banishment. Here is a tip for garden design: mussels also provide a handsome pavement for garden paths.