I'm thinking of making up some mud bricks to use as borders for my no dig gardens and raised beds. Does anyone have a recipe??
Try this one.
Soil that is around 50% to 60% clay and the remainder made up of mostly a sandy type medium, it is not absolutely critical and you can judge it with a water and glass jar test.
Sieve the soil add 3 buckets of it to 2 buckets of sharp sand, add 1 bucket of chaff and roughly 1 bucket of water depending how wet your sand and soil is. This mix also works as a final earth render and for a poured earth floor.