Hi Connie, I found this info on the Dear Jane Website:
How much background do I need?
In the book, I suggest 5 yards for the entire quilt. This is an error on my part. If you are hand-piecing, you will need about 8 yards. If you are machine piecing, I recommend about 15 yards. However, if you are foundation piecing, you will need about twenty. This information had been graciously provided by those who have made the top.
Hope this helps.