Vermiculture is an absolutely simple and amazing solution in a garden. Not only it turns kitchen waste into animal manure but very easy to set up, handle and maintain. For a permaculturist, who do not have the time and energy to handle larger animal stocks (eg. chicken, rabbits, sheep, goats), worms can contribute to garden life with their manure in a low-labour-need way from the point of view of the gardener.
It is also a great thing in flats, small houses, small-scale permaculture spots.