Here we describe the process for grafting garter stitch. Because you have to follow the path of the stitches with a yarn needle this technique is better suited to simple stitches.
Garter stitch is reversible but when you are grafting pieces you need to have the wrong sides together. Follow step 1 to check that you have this correct.
Place the pieces to be grafted so that the points of the needles are to the right. The fabric should be wrong sides together - the front piece will have purl bumps directly under the needle on the right side and the back piece will have knit stitches directly under the needle.
Thread the yarn onto a blunt-ended needle (here we have used a contrasting colour for clarity) and put the yarn needle through the first stitch of the front knitting needle knitwise. Pull the yarn all the way through and do not drop the stitch off the needle.
Put the yarn needle into the first stitch on the back needle purlwise. Pull the yarn through but do not drop the stitch off the needle. This sets up the first two stitches.
Now put the yarn needle into the first stitch on the front needle purlwise, pull the yarn through and drop the stitch off the needle.
Take the needle knitwise through the next stitch on the front needle and pull the yarn through but do not drop the stitch off the needle.
Put the yarn needle knitwise through the first stitch on the back needle and pull the yarn through, dropping the stitch off the knitting needle.
Take the yarn needle purlwise through the next stitch on the back needle but do not drop it off the knitting needle.
Repeat steps 4–7, which is the following sequence: knit into first stitch on front needle and drop stitch, purl into second stitch and do not drop stitch, knit into first stitch on back needle and drop stitch, purl into second stitch and do not drop stitch.
As you work you will see the stitches grafting together. Here the contrasting yarn shows how you have followed the path of the stitches.
Continue repeating the sequence to the end of the row and the completed grafting will look like this.