Two more ways to join Granny Squares.
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Chain Seam – Using Granny Squares without a special finishing edge. With right sides of Granny Squares together (if you want the chain stitches to be part of the design, work wrong sides together), join both Granny Squares with a single crochet through the corner spaces, *chain 3, skip 3 double crochet, single crochet through the next spaces of both Granny Squares; repeat * across joining edge.
Single Crochet Seam – With right sides of Granny Squares together (if you want the joining ridge to be part of the design, work wrong sides together), single crochet (or slip stitch if you prefer) through both top loops of each corresponding Granny Square stitches, creating a crocheted seam. This way does form a bulkier seam.
Video – Simple & Sensational™ – #2 Join Granny Squares with Chain Seam & Single Crochet Seam