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👉 Check Latest PricePlum Slate 40mm Decorative Aggregates are quarried in Wales and is a popular mulch for borders and pathways. The size of the slate mulch is typically 20 to 40mm with a thickness of approximately 5mm. Given this is a naturally quarried product the actual colour of individual pieces do vary between hues of blue, grey and plum. However, the natural variances of shades are what makes this product so popular with garden designers.