Stoneground flour is

whole grain A whole grain is a grain of any cereal and pseudocereal that contains the endosperm, germ, and bran, in contrast to refined grains, which retain only the endosperm. As part of a general healthy diet, consumption of whole grains is associated ...

flour Flour is a powder made by Mill (grinding), grinding raw grains, List of root vegetables, roots, beans, Nut (fruit), nuts, or seeds. Flours are used to make many different foods. Cereal flour, particularly wheat flour, is the main ingredie ...

produced by the traditional process of grinding grain between two millstones. This is in contrast to mass-produced flours which are generally produced using rollers. The process leaves the wheatgerm more intact than roller processes for producing wholemeal flour, the larger pieces of bran and other components of the grain cause it to have a coarser texture but greater flavour. This affects its ability to rise, however it can produce a more satisfying texture for some baked products. The inclusion of more bran and intact wheatgerm in the flour means that it is often credited with significant health benefits. In the US, flour only has to "pass between stones" once during its manufacture to be regarded as stoneground, and it has been claimed that a significant proportion of flour sold as stoneground in the US has not been processed in this way, being ordinary roller-ground wholemeal.USA Today - The Hard Truth About Stoneground Flour
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References

{{reflist Flour Flour mills