Blue Slate 20mm Bulk Bag

20mm Blue Slate – Premium Decorative Slate Chippings for Gardens, Paths and Landscaping

20mm Blue Slate is one of the UK’s most popular decorative aggregates, offering a rich, contemporary look that instantly enhances any outdoor space. With deep blue, grey and natural slate tones, these chippings create a stylish finish suited to both modern and traditional garden designs. Whether you’re updating borders, creating pathways or adding contrast around planting areas, 20mm Blue Slate delivers a clean, attractive appearance all year round.

Sourced from high-quality natural slate, this decorative aggregate is durable, low-maintenance and environmentally friendly. It lies flat due to the natural shape of slate flakes, helping create a neat, stable surface that is pleasant to walk on and resistant to shifting. When wet, the colour deepens to a striking charcoal blue, giving your garden beautiful visual depth and variation through different weather conditions.

20mm Blue Slate is ideal for borders, pathways, water features, rockeries, raised beds and low-maintenance garden areas. It also helps with moisture retention in soil when used as a mulch, supporting healthier plant growth and reducing weed development when installed over a membrane.

Supplied in bulk bags, our 20mm Blue Slate chippings are consistent in size, clean and ready for use, making it an excellent choice for landscapers, gardeners and homeowners.

Key Benefits:

• Attractive deep blue and grey tones for a modern, decorative finish

• Ideal for borders, paths, rockeries and water features

• Low-maintenance, durable and long-lasting

• Slate lies flat for a neat, stable surface

• Colour deepens beautifully when wet

• Helps suppress weeds and retain soil moisture

• Supplied in bulk bags for great value and easy handling

Typical Uses:

• Garden borders and planting beds

• Decorative pathways and walkways

• Rockeries and feature garden areas

• Water features, ponds and streams (fish-safe once washed)

• Ground cover in low-maintenance gardens

• Landscaping around patios and seating areas

Installation Tips:
Spread slate chippings to a depth of around 40–50mm for decorative areas. For pathways or heavier-use areas, 50–60mm is recommended. Use a weed control membrane underneath to reduce maintenance and keep your slate looking tidy. Hose down after installation to remove natural dust and reveal the full depth of colour.

Why Choose Us?
We supply high-quality 20mm Blue Slate that is clean, consistent and sourced from trusted UK quarries. With reliable delivery and premium-grade material, you can count on a long-lasting decorative finish that elevates any landscaping project.