20mm Blue Slate

Blue Slate is our top-selling Welsh Slate. These garden stones feature a striking dark blue hue, resembling a plum-colored stone. They are popular choices for garden borders and decorative accents around homes.

Quarried naturally in North Wales, this rustic slate boasts a beautiful flat, angular finish, with some rounded edges softened by water. The Blue Slate pieces average 20mm in size, making them ideal for creating foot-friendly garden pathways. Additionally, our Welsh Slate is lime-free, ensuring it is completely safe for fish.

These Slate stones are also available in 40mm. Click here to learn more about 40mm Blue Slate.

20mm Blue Slate Features

• Great for garden borders or features
• Best-seller for years
• Locally-sourced
• Fish-friendly

20mm Blue Slate for Your Garden

Blue Slate offers numerous excellent uses for your garden. One popular application is creating a decorative border around your house. Leave a 20cm space around any landscaping, whether it's turf or paving, and fill this gap with beautiful Blue Slate.

20mm Blue Slate also makes a striking garden feature that you can enjoy every time you visit your garden. If you have a small front garden that you don't spend much time in but want an eye-catching element, Blue Slate is an ideal choice. It requires very little maintenance and can be easily laid on a weed membrane.

20mm Blue Slate for Commercial Use

We have supplied 20mm Blue Slate to a variety of businesses, including car parks, public parks, and caravan parks. These stones are ideal for areas that are occasionally walked on and frequently admired. Additionally, some cafes with outdoor dining areas featuring ponds or water elements have used our Blue Slate.

Blue Slate is particularly effective in ponds and water features, as water enhances its colors, deepening the plum and blue shades. Whether used in a garden pond or a simple water feature, Blue Slate adds vibrant color and visual interest. Since our Welsh Blue Slate is lime-free, it is safe for any wildlife in your ponds.

How to Buy 20mm, Blue Slate

20kg maxi bags 

850kg bulk bags (approx weight)

This stone can be collected for free at one of our depots in Wimborne, Bournemouth or Dorchester, or these garden stones can be delivered nationally to anywhere in the UK.

You can use our Stone Calculator to work out how much of this stone you need - simply enter the measurements of your garden, the depth at which you want to lay the stone and it will work out how much you need!

How to Create a Garden Pond 

The trend for garden ponds is growing. Some people prefer a small, tidy pond surrounded by garden paving, while others enjoy creating wild areas with natural ponds to encourage wildlife. If you're up for the challenge of adding a pond to your garden, read our how-to guide below for the best tips and tricks!

Plan Your Pond Location: Choose the best spot for your pond. Avoid placing it under trees to keep the water clean and visible. Select a location that receives both sun and shade throughout the day to provide a cool retreat for birds.

Decide on Size and Type: Determine the size and type of your pond. For a ground-level pond, consider purchasing a plastic pond from your local garden center. Mark the desired area with spray paint to ensure it matches the pond's size. For a raised pond, use retaining sleepers lined with a plastic sheet or upcycle an old tire.

Prepare the Area: For a ground-level pond, dig out the area to the correct depth. Fill any gaps with scalpings after placing the pond.

Add Water: Begin filling your pond with water. Consider using a plug-in or solar-powered water pump to create a water feature, and you can even add a small fountain for extra visual interest.

Decorate Your Pond: Enhance your pond's appearance by starting with larger rockery stones like Blue Slate Rockery and then adding smaller stones like Blue Slate. Incorporate water plants from your local garden center for a natural look.

By following these steps, you can create a beautiful and functional garden pond that suits your style and encourages local wildlife. Enjoy your new garden feature!

PLEASE NOTE: Due to our Decorative Stones being a naturally-sourced product, there will always be some variation from batch to batch, especially in terms of colour. On occasion, your garden stones may be very dusty; we recommend hosing your new stones down to wash them and reveal their true colour. 

Buy With Confidence

• Our 20mm Blue Slate can be purchased in 20kg maxi bags or bulk bags that weigh approx. 850kg
• Not sure how much you need? Use our quantity calculator and enter your garden width and length to find out how many maxi bags/bulk bags you need! 
• Please select the bag size you'd like to buy and add it to your basket 
• Our aggregates will either arrive on a HIAB lorry that can be used to lift the stone onto your garden, or it will arrive on a pallet for kerbside delivery; depending on your address
• You can choose a free collection from one of our Depots or fuss-free, home delivery.

A Service You Can Rely On

• Our reliable service offers prompt delivery to any area in the UK
• Stone Zone is a family-run business that has been well-established since 1998
• Our efficient customer advisors can help you with your purchase
• We pride ourselves on offering a range of affordable garden supplies 

Sample stones are available in-store and online, please ask a customer advisor. 

A Delivery Service Tailored to You

Our top-rated delivery service is flexible and reliable to suit you, however, it can vary depending on where you live. Click here for more information on our delivery service and if your postcode is classed as 'local' or 'national.'

Any questions? Use our live chat to speak to an advisor, alternatively, you can fill out an enquiry form or call us on 01202 874207.