The idea of having a spiral herb garden was introduced when reading about permaculture and, more recently, discussing the garden with a friend who had done the permaculture course.
Microholding fits nicely with the theories of permaculture, as we want low maintenance and high productivity, but with plenty of nooks and crannies for encouraging wildlife to visit our garden. It also lends itself quite well to frugal living and a level of self-sufficiency.
The following is a step-by-step pictorial guide to how we created our first herb spiral. It isn't quite 2 metres in diameter, as the stick I used to mark it out was only 3' long.