We added a few scoops from the compost pile. The compost pile we un-earthed while scraping weeds off this "mountain" we found. Underneath, a small gold mine of well rotted, very nice composted manure.
It's not big by any means, but it gives us a small area for kitchen use herbs.
For the moment we have: chives, rosemary, lavender, basil, oregano and Italian parsley. We bought most of these as starts and will be adding more in that we've grown here on the farm soon. We've left room for access to the air conditioner (I can't believe we have an AC) and the propane tank, all neatly tucked into an area about 8' x 10' with tons of room for more.