20mm Green Slate

Sourced from the breathtaking landscapes of North Wales, our Welsh Slate and Paddlestones are a premium choice for enhancing gardens, landscaping projects, or adding a modern, stylish touch to your home’s exterior. As part of our Decorative Stone collection, these slates are prized for their natural beauty, durability, and versatility.

20mm Green Slate – A Distinctive Choice

One of our standout options is 20mm Green Slate, a vibrant, earthy-toned garden stone that brings a natural, organic feel to any outdoor space. Its subtle green hue, accented by occasional grey undertones, creates a striking yet harmonious look.

Color & Appearance

Dry: A soft, dusky green that blends seamlessly with natural surroundings.

Wet: A deep, rich green with a glossy sheen, highlighting the stone’s full beauty.

Shape & Versatility

Unlike rounded pebbles or shingle, slate rockery has a flatter, angular form, creating a structured, layered effect in landscaping. With an average size of 20mm, these slates are ideal for:

✔ Garden pathways – Comfortable underfoot and visually stunning.
✔ Decorative features – Perfect for rockeries and borders.
✔ Ponds & water features – 100% lime-free, making them fish-friendly and safe for aquatic life.

Whether you're designing a low-maintenance garden, enhancing flower beds, or crafting a striking water feature, 20mm Green Slate is a timeless and versatile choice!

20mm Green Slate Features

• Locally-sourced garden stone
• Great for garden borders
• Fish-Friendly; suitable for ponds

Green Welsh Slate for Your Garden

If you’re looking to transform your front or back garden, 20mm Green Slate is a fantastic choice to instantly brighten and elevate the space with both style and functionality.

Ways to Use 20mm Green Slate in Your Garden

✔ Bordering Your Home – A stylish design trend is using Green Slate as a decorative border around your house. When paired with lush greenery, vibrant plants, and sleek Porcelain Paving, it creates a structured, polished look.

✔ Natural Dividers – These slates can act as elegant yet functional barriers between grass turf and patios or help define different garden zones. Their flat, angular shape adds structure while maintaining a seamless, organic feel.

✔ Effective Drainage Solution – Green Slate isn’t just beautiful—it’s highly practical! Its natural properties allow for efficient water drainage, helping to prevent puddles and waterlogging in your garden.

✔ Plant Bed Decoration – Extend the green tones throughout your garden by using these stones around flower beds and shrubs. The deep green hues provide a striking contrast to colorful blooms, enhancing the overall landscape design. Additionally, these stones help retain soil moisture and protect against erosion caused by heavy rain or sun exposure.

Whether you're designing a modern, minimalist space or a wild, nature-inspired retreat, 20mm Green Slate offers the perfect balance of aesthetic appeal and practical benefits for your outdoor oasis!

20mm Green Slate for Your Garden Pond

Green Slate is completely lime-free, making it a safe and eco-friendly option for fishponds and wildlife-friendly gardens. Its vibrant green tones blend beautifully with surrounding plants and water, creating a natural, harmonious look that enhances any outdoor space.

Why Choose 20mm Green Slate for Ponds?

✔ Safe for aquatic life – No lime content, ensuring a fish-friendly environment.
✔ Natural aesthetic – Adds an organic touch to ponds, seamlessly integrating with garden greenery.
✔ Enhances visual appeal – The rich green tones create a striking contrast with the water, making your pond a focal point.

Create a Stunning Water Feature

For a cohesive and dynamic pond design, consider pairing Green Slate with matching Green Slate Rockery to build a layered rockery water feature. You can also explore Green Slate Paddlestones and Green Granite Chippings (available in 14mm & 20mm) to add texture and depth to your landscape.

Would you like ideas for a pond layout or a complete garden design featuring Green Slate? Let me know—I’d love to help! 🌿💦

How to Buy 20mm, Green Slate

This stone can be collected for free at one of our depots in Wimborne, Bournemouth, Christchurch 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!

Available Pack Sizes

20kg maxi bags 

850kg bulk bags

40mm Green Slate is also available here.

How to Create a Garden Pond 

Garden ponds are an increasingly popular feature in modern outdoor spaces, adding both tranquility and biodiversity to your landscape. If you're thinking about installing one, follow this simple guide to create a beautiful and functional pond in your garden.

1. Choose the Perfect Location

Selecting the right spot is key to maintaining a healthy pond. Keep these factors in mind:
✔ Avoid trees – Falling leaves can create excess debris, making maintenance more difficult.
✔ Balance sun and shade – Too much direct sunlight can encourage algae growth and fluctuating water temperatures.

2. Determine the Size and Type

Once you’ve chosen a location, decide on the size and structure of your pond:
✔ Ground-Level Pond: The simplest option is a pre-formed plastic pond, available at garden centers. Place it in your chosen spot and trace its outline with spray paint before digging.
✔ Raised Pond: For a more structured look, build a raised pond using sleepers lined with a waterproof sheet. This option stands out as a stylish garden feature.

3. Dig and Prepare the Area

For a ground-level pond, carefully dig out the marked area to match the pond’s depth. To ensure stability, fill any gaps with scalpings before placing the pond liner or pre-formed pond into the hole.

4. Add Water and Features

Now for the exciting part—filling your pond! To enhance both aesthetics and functionality, consider adding:
✔ A solar-powered water pump for continuous water circulation.
✔ A small fountain to create a calming, decorative water feature.

5. Decorate with Natural Elements

The final step is blending your pond seamlessly into your garden with natural landscaping:
✔ Border your pond with 20mm Green Slate and decorative stones for a natural, textured look.
✔ Introduce aquatic plants to encourage wildlife and a balanced ecosystem.

Final Note

Since our decorative stones are naturally sourced, slight color variations are expected from batch to batch. Some stones may arrive with a light dust—simply hose them down to reveal their true, vibrant tones.

With these easy steps, you can create a stunning garden pond that enhances your outdoor space. Ready to bring your pond vision to life?

Buy With Confidence

• Our 20mm Green 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, please ask a customer advisor. 

A Delivery Service Tailored to You

Our top-rated delivery service is reliable and flexible 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.