Cluster stitch is crochet classics. This name is given to the whole family of stitches with the different names but the similar technique to crochet. Each of them is formed as a group of stitches gathered at the top, or the bottom, or sometimes both. Their names are: CLUSTERS, BOBBLES, and PUFFS.
They are easy to crochet and have the endless possibilities to be combined with the other stitches to create the new patterns. A group of stitches makes clusters much more volumetric, hence much more decorative, than a single stitch.
There are a lot of variations to crochet this stitch. It can serve both as a decorative element and the way to decrease stitches in a row. You can crochet these stitches by using single crochets, double crochets, or treble crochets. The number of stitches in a cluster can be different. The more stitches included in a group, the more decorative stitch you will get.
A group of stitches in this kind of stitch is joined at the top. You can crochet either double or treble crochets to form the stitch. Depending on the desired look, number of stitches in the group can be different. The video below demonstrates a stitch created with three double crochets.
Here is the process to get the idea:
Your hook is at stitch where you going to crochet a cluster.Let watch and follow the video.

Sometimes it is quite confusing for the not experienced crocheter to distinguish the stitches of the cluster family. Here is how bobble stitch looks like. Unlike a cluster stitch, a group of stitches is gathered both at the bottom and at the top.
A video tutorial for the PUFF stitch.
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