Grass, Grass, and more Grass!

Fianlly! After months of trying to get the back yard in order we finally have grass! Well almost. The landscapers are putting in the sod as I write. We are extending the front yard and then I will add some rose bushes and flowers for some color. In the back, we will have a large grass area, a garden, and patio and a fire pit area. The real question is, how big of a garden do I need?