Before and after the most recent work day.
I've been working on building an herb spiral in my parents yard in Delaware. It's just about finished.
An herb spiral is a permaculture design that allows you to grow up to 16 different herbs all requiring different conditions, from watercress and mint to rosemary and oregano. The design channels water from the top of the garden to the small pond at the bottom. The structure creates microclimates through variation in sunlight and soil moisture. We'll place plants at the top that need less water, and plants at the bottom (near the pond) that need more water. The north side will have shade-loving herbs and the south side will have herbs that need more light. The idea is to grow a wide variety of herbs that will be available for the kitchen.
It's a good idea to place an herb spiral close to the kitchen. That way, if you're cooking dinner, you can easily cut fresh herbs for your recipes.
If you want to learn more, or build your own, detailed instructions can be found here: http://fuentesfarm.wordpress.com/2014/02/04/spiral-herb-garden-chart/