Limestone

No. Limestone cobbles are one of the cheaper ways to edge a border with real stone. Our Kota Black Limestone cobbles in 10 x 10cm start from around £0.49 each, so a single row costs under £5 per metre of border. A 100-cobble pack covers 1m² at around £49. The 20 x 10cm size is around £1.04 per cobble. Delivery is charged by pallet and postcode, and we deliver within 7 working days. 

Yes. Limestone cobbles make a strong, long-lasting lawn edge. At 30 to 50mm thick they are far more robust than paving slabs, so they cope with the mower, the strimmer and foot traffic without cracking. Bed them on mortar rather than loose soil and they will stay put for years. 

The most common mistake is laying cobbles on loose soil or sand without a mortar bed, so they shift and sink within a season. Others we see often are no haunching (the wedge of concrete behind the cobbles that stops them tipping), mortar smeared on the stone face, which stains limestone, and joints packed so tight that nothing can be pointed. 

Set the cobbles level with the lawn or no more than 10mm below it. That lets the mower wheels run straight over the stone with the blades clearing the surface, and there is nothing to catch the strimmer on. If the edging is raised at all, the mower will skim the edge and you end up trimming by hand. Our 10 x 10cm Kota Black cobbles work well as a mowing strip because a single row gives a 100mm-wide flat band between the lawn and the bed. 

Yes. They are the same Kota Black stone, so the colour matches. Our Kota Black Limestone patio packs are sawn-edged slabs around 22mm thick, while the cobbles are hand-dressed and 30 to 50mm thick, so you get the same deep black with a slightly more rustic edge on the border. One thing to know: black limestone fades to dark grey over time unless sealed, so seal the slabs and cobbles together to keep the match. 

No. Our largest limestone edging is the 20 x 10cm Kota Black cobble, and we do not stock limestone kerbs or long edging blocks. For a wider border, lay two rows of cobbles or stand the 20 x 10cm size on its side. If you want longer single units, we stock porcelain edging in 90 x 20cm and 100 x 16cm lengths, though these are thinner and better suited to patio edges than to kerbs. 

Yes, provided they are bedded and haunched properly. An edge restraint only works if it cannot move, so set the cobbles on a concrete bed and back them with a haunch of concrete at least 100mm wide, finished just below the top of the cobble so it is hidden by soil or turf. Laid like this, our 30 to 50mm thick Kota Black cobbles will hold the blocks and sand in place. Loose-laid cobbles will not restrain anything, so skip the mortar and the blocks will spread. 

Yes, and the 10 x 10cm size is the better choice for curves. Because each cobble is only 100mm long, a row follows a tight radius without the joints fanning open on the outside of the bend. On a tighter curve, open the outer joints slightly and keep the inner ones close; the hand-dressed edges disguise any small variation. The 20 x 10cm cobbles will follow a gentle sweep but show wedge-shaped gaps on anything tighter.