Rolling edges

I’m making hats and scarves for my whole family for Christmas this year (14 sets in all) they are all coming out looking great so far i have finished 5 sets and i’ve only been working on them a couple weeks. The problem is my scarves are all rolling up width wise. How do i get them to unroll and lay flat? :wall:

Stockinette stitch (knit one row, purl one row) curls. There is an entirethread devoted to it here.