This is so simple that I want to build a replication. This guy knows what he is talking about as you can see by watching his other videos. This is a commercial process in Germany.
Life on a farm is a school of patience; you can't hurry the crops or make an ox in two days.
Henri Alain
Make yourself as serene as a flower, as a tree. And on wednesdays, as serene as this tiny ad:
It's a bit like "run away to the circus" but with gardening