Doing a classic granny (3dc group) stitch to join the granny squares gives you near to a joint. • the perfect crochet granny. The single crochet method and the join as you go method.
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Joining Granny Squares joinasyougo The Crochet Swirl
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Web this is perfect if you are looking to mimic the joint into the squares.
Web here are two methods.A quick video showing you a technique for joining your granny squares.