OFA has an article on what to add to your soil in the spring. Here’s what we do. Three of our five raised beds have no contact with the soil so they need a bit more help. For those, we:

• use a garden mix from our local landscape company to fill them almost back to the top;
• bring them all the way to the top with purchased compost;
• fill in around plants with castings from our little worm farm.

For the areas where we plant directly in the ground, we first:

• put down cardboard to kill the grass and weeds, and
• cover that with mulch.

Once those areas are established, we simply add a fresh layer of compost every year. It seems to be working–there are worms active all over those areas, just beneath the surface.