20mm Green Slate

Sourced from the stunning landscapes of North Wales, our Welsh Slate and Paddlestones are a fantastic choice for enhancing gardens, landscaping projects, or adding a sleek, modern touch to your home’s exterior. As part of our extensive Decorative Stone collection, these slates stand out for their natural beauty and durability.

One of our most distinctive offerings is 20mm Green Slate—a vibrant, earthy-toned garden stone that effortlessly creates a naturalistic outdoor space. This slate’s subtle green hue, mixed with occasional grey undertones, makes a striking statement in any landscape.

Color & Appearance

• Dry: A muted, dusky green shade that blends seamlessly into natural surroundings.
• Wet: A deeper, richer green with a glossy sheen, bringing out the full beauty of the stone.

Shape & Versatility

Unlike traditional Pebbles or Shingle, Slate Rockery has a flatter, angular form, giving it a more structured and layered appearance. With an average size of 20mm, these slates are an excellent choice for:

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

Whether you’re looking to design a low-maintenance garden, add a decorative touch to flower beds, or create a stunning water feature, 20mm Green Slate is a timeless and versatile option!

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 enhance your front or back garden, 20mm Green Slate is a fantastic choice to instantly brighten and elevate the space.

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

✔ Natural Dividers – These slates can serve as a stylish and functional barrier between Grass Turf and a patio or separate different garden zones. Their flat, angular shape helps define spaces while maintaining a seamless, organic aesthetic.

✔ Effective Drainage Solution – Green Slate isn’t just visually appealing—it’s also highly practical! Thanks to its natural properties, it allows water to drain efficiently, reducing puddles and waterlogging in your garden.

✔ Plant Bed Decoration – To extend the green accent throughout your garden, consider using these natural stones around flower beds and shrubs. The deep green tones beautifully contrast with colorful blooms, creating a cohesive and eye-catching landscape design. Additionally, these stones provide protection against harsh sun and heavy rain, helping to preserve soil moisture and prevent erosion.

Whether you’re aiming for a modern, minimalistic look or a wild, nature-inspired garden, 20mm Green Slate offers both aesthetic appeal and functional benefits to enhance your outdoor space!

20mm Green Slate for Your Garden Pond

Green Slate is completely lime-free, making it safe for use in fishponds and gardens frequented by wildlife. This 20mm Green Slate is often chosen specifically for fishponds or garden ponds because its vibrant green color adds a unique, natural touch to the water, blending seamlessly with the surrounding greenery and creating a more cohesive look in your garden.

Not only does this slate give your pond a natural appearance, but it also adds a pop of color that makes it stand out beautifully within your outdoor space. For a more integrated design, consider pairing your Green Slate with our matching Green Slate Rockery to create a stunning rockery water feature. Additionally, Stone Zone offers Green Slate Paddlestones and Green Granite chippings in both 14mm and 20mm sizes, allowing you to craft or decorate around your garden pond with complementary materials that enhance the overall aesthetic.

Would you like me to expand on any of these ideas, like creating a pond layout or designing a cohesive garden look? Let me know! 🌱

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 becoming an increasingly popular feature in modern outdoor spaces, adding both diversity and tranquility. If you're considering adding one to your garden, we’ve put together a step-by-step guide to help you create a beautiful and functional pond.

1. Choose the Perfect Location

Start by selecting the best spot for your pond. Keep these key factors in mind:

Avoid placing it under trees to minimize falling leaves and debris, which can make maintenance more challenging.

Find a balance of sun and shade—too much sun can lead to excessive algae growth and fluctuating water temperatures.

2. Determine the Size and Type

Once you’ve chosen your location, decide on the size and depth of your pond. Here are two main options:

Ground-Level Pond: The easiest option is a pre-formed plastic pond, available at garden centers. To ensure a proper fit, place the pond in your chosen spot and trace its outline with spray paint.

Raised Pond: For a more structured look, consider using sleepers lined with a plastic sheet. This is a great alternative if you want a pond that stands out as a garden feature.

3. Dig and Prepare the Area

If you're going with 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 your pond liner or pre-formed pond into the hole.

4. Add Water and Features

Now comes the fun part—filling your pond with water! To enhance the look and functionality of your pond, consider:

• A solar-powered water pump for continuous water movement.
• A small fountain to create a beautiful, soothing water feature.

5. Decorate with Natural Elements

The final step is landscaping around your pond to make it blend naturally with your garden. Enhance its look by:

Using 20mm Green Slate and smaller decorative stones to create a natural border.

Adding aquatic plants to give your pond an organic, wildlife-friendly feel.

Final Note

As our decorative stones are naturally sourced, variations in color are expected from batch to batch. Some stones may arrive dusty—simply hose them down to reveal their true color.

With these simple steps, you can create a stunning garden pond that brings life and beauty to your outdoor space. Ready to get started? 🌿💦

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.