Crocheting in a spiral is a method of continuous crochet stitches, in which the next round is built on the previous round, without using a slip stitch to join rounds. The circle can be started with a series of chain stitches joined by a slip stitch or by using the Magic Ring method.
Decide upon your beginning method, which can be either chain stitches or Magic Circle. Join the chain stitches with a slip stitch, or tighten your Magic Circle. Place a marker at the beginning of the round. In order to keep the spiral flat, each row requires an increase of stitches. The marker is essential to knowing when to change the increase pattern. Keep track of the rounds to help recognize when to add the next increased stitch.
In the first round, single crochet two stitches per stitch. In round two, single crochet two stitches in the first stitch and one in the next. Repeat this two-stitch pattern to the end of the round. In round three, single crochet two stitches in the first stitch and one single crochet in each of the next two stitches. Repeat this three-stitch pattern to the end of the round. Each round should add one more stitch between increases than the previous round. The round number is a reminder of the number of stitches to be worked in the increase pattern.
Continue until the project is as large as desired. For a project like a hat, continue increases until the desired circumference is reached, and then stop increasing, but continue crocheting in a spiral. Join the last stitch as a slip stitch to finish the project, cut the yarn, and pull through and weave in the ends.