Originally Posted by
dunster
If you've pressed your seams open then there is no ditch to stitch in.
There is always a ditch. It's the line between the two fabrics. It's probably even easier to see when the seam is pressed open.
Sometimes stitch-in-the-ditch is used to hold everything in place before you start other quilting. Then it wouldn't matter if the seams were pressed open. Those threads will hold it as you wish.