How to sew crochet pieces together usually means joining finished squares or motifs with a yarn needle rather than crocheting them together with a hook, giving a flatter, less bulky seam for blankets and garments. I switched to sewn seams for all my granny square blankets years ago, since the finished edge lies flatter than a crocheted join. This guide covers the two main sewing methods and when to use each.
Whip Stitch
Hold two pieces with right sides together, edges aligned. Thread a yarn needle and stitch through both layers’ outer loops, moving along the edge in a simple over-and-over motion, then weave in the tail. Whip stitch is fast but creates a slightly raised seam on the right side.
Mattress Stitch
Lay both pieces right side up, edges touching rather than folded together. Stitch through the corresponding bar of each stitch on alternating sides, pulling the yarn snug every few stitches to draw the seam invisibly closed. Mattress stitch takes longer but produces a nearly invisible join.
Frequently asked questions
Which is better, whip stitch or mattress stitch?
Whip stitch is faster and fine for the inside seams of a blanket, while mattress stitch takes longer but gives a nearly invisible seam, better suited for garment side seams where the join is visible.
Ready to join a full blanket of squares?
Plan your seam method before you start joining a large batch of motifs.
Find a local class for hands-on help