Making a seamless blanket

I am making a baby blanket where the middle is cable knit and then the stitches are picked up all around the blanket for a garter stitch border. Is there any way to pick up stitches so that there is no seam?

I don’t know this pattern, but if I had to guess I’d say that they want you to pick up stitches so the garter edge ridges go longways along the edges.

If you don’t mind a different look you could just add x number of stitches to the pattern and knit the edge as you are working. For example add 10 stitches and knit 5 stitches on each side for the border. If you do this don’t forget to add some rows at the bottom and top to match.