How to Crochet a Shell Stitch

You only need a few things. Grab a ball of worsted or DK weight yarn, a crochet hook that matches your yarn weight (a 4 to 5mm works well), a pair of scissors, and a tapestry needle for weaving in ends later. A stitch marker is handy for keeping track of where each repeat starts. Smooth, light-colored yarn makes it much easier to see your stitches while you learn.

Start with a slip knot on your hook, then chain across to make your foundation row. Keep the chain loose and even so the base does not pull tight under the shells. Count as you go and aim for a stitch count that fits the repeat cleanly. If your chain feels stiff, go up a hook size for the foundation only, then switch back.

Turn and work your first stitches back into the foundation chain. This anchors the row and gives you a base to build the first shell on. Go slowly here and make sure you are working into the right chain, since the start of the row sets the spacing for everything that follows. Keep an even tension so the edge stays straight.

Here is the fun part. Work five treble crochet stitches (US double crochet) into the same chain space. Watch the little fan spread out from one point as each stitch stacks beside the last. That fan is the shell, and it is the whole reason this pattern looks so pretty. Keep your stitches at the same height so the shell sits even and rounded.

Now build the repeat. Skip two chains, work five trebles into the next chain to form the shell, skip two more chains, then place a double crochet to anchor it. Carry that sequence all the way across the row. The shells and the single anchor stitch between them create the wavy scalloped edge that gives the stitch its name. Keep counting your skips and you will stay on pattern.

At the end of the row, turn your work to start the next one. To bring in a new color, drop the old yarn and pull the new shade through on your last stitch of the row. Doing the swap right at the edge keeps the color line crisp and hides the join. Leave a tail on each color so you can weave it in cleanly at the end.

On every row after the first, place your shells into the anchor spaces from the row below, and put your anchor double crochet into the center stitch of each shell below. That offset is what makes the shells stack into neat columns instead of drifting. Keep repeating and you will see the fan pattern lock into place row after row.

Keep going until your piece is the size you want, then fasten off. Thread your tapestry needle and weave in every loose tail so nothing unravels. Look at the finished fabric and you can see the fan shells lining up into soft ripples. It works up into blankets, scarves, and hats, and the same repeat scales to any width you like.