One method to prevent the bottom edges of stockinette knitting from rolling is to add multiple rows of latch tool cast-on to the bottom edges of your knit pieces. Here’s how…
Carriage on right.
Latch tool cast-on from left to right.
Add yarn to the carriage feeder.
Knit to left.
*Push in right part button, free pass carriage back to right hand side.
Remove yarn from carriage.
Behind the knitting on the needles, latch tool cast-on another row. This will show on the knit side of your piece. For the final needle, take that stitch off with a single prong transfer tool, put the stitch that’s on the latch tool onto that end needle then put the stitch on the transfer tool back on that needle.
Knit 1 row to the left.*
Repeat between * to * once more. This will prevent the natural curl towards the purl side at the bottom edge.
You can add an additional row of latch tool cast-on if desired. Some cotton yarns can really fight to curl. This techinque is also fun to do in a contrast color. Glenda Overmann used a contrast color latch tool cast-on behind the knitting to add rows of interest in her lace Little Darlin’ pattern.