Clusters are 2 or more crochet stitches that have been joined at the top into a single stitch. A cluster can be worked out of any combination or number of stitches. The defining characteristic of a cluster is that the very last loop of a stitch is left unworked on the hook temporarily until all stitches in the cluster have been also partially worked to the last loop. The final step of a cluster is a yarn over and the yarn is pulled through all of the loops on the hook to create a single stitch.
Clusters are used for decreasing as well as to create a decorative effect in the fabric.
The photos below show an example of a cluster comprised of 3 dc's worked over 3 consecutive stitches.
||Step 1: Partially work a double crochet stitch up until the point just before the "yarn over / pull through".|
||Step 2: Yarn over, insert the hook into the next stitch and create another partially-worked double crochet stitch similar to the first stitch created.|
||Step 3: Yarn over, insert the hook into the next stitch and create a final partially-worked double crochet stitch similar to the first two partial stitches.|
||Step 4: Yarn over and draw the yarn through all the loops on the hook This completes the cluster of 3 double crochet stitches.|