Making a seamless join is a great way to knit a circular project look polished. And it’s so easy!
I’ve seen people use their cast on yarn to weave in the edge and make it look flat. But why do that if this is so easy?
Setup: Cast on all your stitches that you need plus one additional stitch (for example, if you needed 100 stitches you would cast on 101 stitches). In my pic, I needed to CO 17 sts, so I started with 18.
Step 1: Make sure that the round isn’t twisted on your needle(s). Slip the first stitch you cast on (typically the slip knot) from your left needle to your right.
Step 2: Slip the last stitch you cast on (now the second stitch on your right needle) over the stitch you just passed onto it. Do this just like you would if you were binding off. Now you’re back to the correct amount of stitches.
Step 3: Slip the stitch back to your left-hand needle.
Step 4: Tighten both yarns (the yarn tail and the working yarn) so it has regular tension. The stitch you’ve passed over and back should now look like the other loops.
And that’s it! You can now knit a regular round. You’ll probably want to put a stitch marker to note the new round before you start knitting.
And here it is after a few rounds are knit. All we have to do is weave in the tail and we’re done!