Soil, I can go on for ever, here and a day.
Mayans used slaves to mix and make soil. This is my first attempt at building a mixer. I called it the "100 Mayan Hands". The 2hp AC motor did not have the power and my small generator could not deliver what the motor needed to run under torque conditions. Different soil is required for different plants and gardens and I am having a hard time finding clay. I like to call clay soil glue.
The garden below is called the Colonizer AOE.