Concerns have been raised about the quality of garden soil products in Australia, with some consumers finding unexpected contaminants. Glass, plastic, roof insulation, and oyster shells are just a few examples of debris found in top dressing and potting mix products. While regulations differ by state, experts say poor labeling and lack of transparency make it difficult to trace contamination sources.

Source: https://www.theguardian.com/australia-news/article/2024/aug/10/glass-plastic-roof-insulation-oyster-shells-what-australian-consumers-found-in-garden-soil-products