Blue Slate 20mm
Available in: Bulk Bag, Large Pack
Fish friendly: Yes
Stone size: 20mm
Blue Slate Decorative Aggregate is a striking 20mm slate in cool blue-grey and charcoal tones with a distinctive flat, angular shape. Muted when dry and richly blue when wet, it’s perfect for borders, paths, water features, and pots. Hard-wearing, free-draining, and available in bulk bags or large packs.
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Not all stockists carry every Bowland Stone range, but may be able to order products in branch.
| Pack Size |
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Bulk Bag |
Large Pack |
Description
Add a touch of natural, contemporary style to your outdoor space with our Blue Slate Decorative Aggregate. These distinctive 20mm slate pieces display beautiful cool blue-greys alongside deeper charcoal tones, with the flat, angular, plate-like shape that makes slate so instantly recognisable. The result is a smart, textured finish that brings real character and a refined, modern edge to any garden, border, or feature area.
The naturally layered slate flakes sit neatly together to create a sleek, low-profile surface that’s both elegant and practical. When dry, the slate has a soft, muted blue-grey tone; once wet, the colours come alive, deepening into rich blues and near-blacks with a subtle sheen that shows off the stone’s natural beauty at its best.
Versatile and hard-wearing, this aggregate is ideal for a wide range of landscaping projects. Use it to dress borders and beds, create striking pathways, top water features, or finish pots and planters with a clean, contemporary layer. Blue Slate is a designer favourite for modern schemes, pairing beautifully with light paving, timber, grasses, and architectural planting, where its cool tones provide a stylish contrast.
As well as looking great, slate is low-maintenance and free-draining, helping to suppress weeds and keep surfaces neat all year round. The flat 20mm flakes knit together well to give excellent ground coverage and a tidy, attractive finish that works as well in feature areas as it does across larger spaces.
Supplied in convenient bulk bags or large packs, our Blue Slate Decorative Aggregate makes it easy to order exactly the right amount for projects of any size. As a guide, we recommend a coverage depth of around 40–50mm for paths and borders.
For help with quantities and coverage, please view our aggregate calculator (click here).