A cluster stitch is a group of stitches in either DC or TC (US terms) partially worked then completed as 1 stitch. A very common cluster stitch is a 5dc cluster otherwise known as a bobble stitch.
Usually you will see a cluster written as 3dc cluster, 7dc cluster, 3tc cluster 5tc cluster. Unless the key at the start of the pattern states otherwise.
Cluster stitches are completed in the same method regardless of how many stitches you are using for the cluster. You will work the stitch until you have 2 loops left on your hook but instead of completing the stitch you begin the next stitch in the same space, only when you have the right amount of half completed stitches will you yarn over and pull through all the loops on your hook to complete.
For the below photo tutorial I will complete a 3dc cluster used in my Clusters and Crosses Shawl.
To complete a 3dc cluster, yarn over and insert your hook into the next stitch, yarn over and pull up a loop, yarn over and pull through 2 [2 loops on hook], yarn over, insert your hook into the same stitch and pull up a loop, yarn over and pull through 2 [3 loops on hook], yarn over, insert your hook into the same stitch and pull up a loop, yarn over and pull through 2 [4 loops on hook], you then yarn over and pull through all 4 loops, this completes your 3dc cluster. See picture guides below.
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