Natural field stones are pushed up to or near the soil surface during the winter months when the ground freezes. They are found on farmland when the land is tilled. These stones are gathered, sometimes cut to shape and sold. They are often used to make outdoor walls but also make an excellent edge around a garden. Natural field stones help separate and prevent grass from invading the garden.
Calculate how much natural field stone you need to buy. For every 10 feet of wall at 6 inches tall and 18 inches wide, you will need approximately 500 lb. stone. Because field stones vary in size and weight, always ask the distributor how much you should buy for your desired wall. Keep extra stones in storage for replacements as necessary.
Dig a trench that is about one-third to one-half as deep as the stone is tall. The width can vary, usually about 12 to 18 inches and as wide as most of the stones. Edges made of field stones can be straight or curved.
Pack down the soil and level the bottom of the trench as much as possible. Use a level, if desired.
Sort the stones into different piles, such as curved stones, stones with right angles, large and small. This will make laying the stone easier.
Lay the stone along the bottom of the trench and add another layer in a staggering pattern, if possible. Use various sizes and shapes and piece together layers like a puzzle to fill in as much space as possible. Edging made of flat field stones that have similar shapes as flagstone is usually comprised of two layers. Round field stones are only used in one layer.