Decorative River Rock Per tonne: $94 Per 30L bag (65 pound): $10.99 Decorative River Rock is a mixture of rounded grey and multicoloured granite that is sourced in Ontario. Adding river rock to your garden can create a dramatic yet natural look. River rock is an attractive, versatile, low maintenance addition to any property and can be used for garden edging, pathways, rock gardens, lawn edging, container plant toppings, and more. We carry small river rock (roughly 1-3″) as well as large river rock (roughly 2-5″)*. As sizing and colour does vary with each delivery, we recommend stopping in to the yard during operating hours and taking a look at the current stock.