The short answer: stocking stitch always curls. The sides roll towards the back, and the top and bottom roll towards the front. It’s how the fabric is built, not a mistake. Patterns stop the curl with borders of garter stitch or rib, and blocking calms it down.
What stocking stitch is
Knit one row, purl the next, and repeat. That simple rhythm makes stocking stitch: smooth Vs on one side and bumps on the other. It’s the fabric of most jumpers, socks and hats. Patterns usually write it as “Row 1 (RS): knit. Row 2 (WS): purl.”
The smooth side with the Vs is the right side (RS). It’s the outside of a jumper. The bumpy side is the wrong side (WS). In stocking stitch you knit every RS row and purl every WS row.
Why it curls
Because one side is all knit stitches and the other is all purl stitches, the fabric isn’t balanced, and the edges roll. It always happens in the same way:
- The sides roll towards the back (the purl side).
- The top and bottom roll towards the front (the knit side).
You’ll notice it on your first swatch, and on any small piece of plain stocking stitch. Fabrics that mix knits and purls on the same side behave differently: moss stitch (US seed stitch), for example, is a pebbly, reversible fabric that lies flat and doesn’t curl.
How to stop stocking stitch curling
- Add a garter stitch border. Garter stitch (knit every row) lies flat. Knit a few rows of garter at the bottom and top, and knit the first and last few stitches of every row. The course’s tension square does exactly this: knit 4 rows, then “knit all stitches” on RS rows and “k3, purl to last 3 sts, k3” on WS rows, then 4 more rows of garter. The garter border stops the edges curling, so the square lies flat.
- Or use rib at the edges. Rib puts knit and purl stitches side by side in the same row, making columns that pull in and spring back. That’s why garments start and finish with rib at cuffs, hems, necklines and hats.
- Block it. Blocking means washing (or steaming) your knitting and drying it flat so the stitches relax and even out. It calms the curl down. Soak in lukewarm water with a drop of wool wash or mild shampoo for 20 minutes, squeeze (don’t wring), roll in a towel, then lay flat and pat into shape without stretching. Leave it until fully dry.
Acrylic yarn? Soaking won’t change it much, but still wash and dry it flat. For a softer finish you can steam it: hold a steam iron 2–3 cm above the knitting, never touching it, then let it cool completely. Pressing a hot iron onto acrylic melts it flat for good.
Measuring a curly swatch
If your tension square (US gauge swatch) curls at the edges, that’s why the garter border is there. Block it and pat it flat. Always measure the middle, away from the border, never the edges. Don’t pin it flat; just measure the middle gently.
While you’re here: read your stocking stitch
Put your knitting down mid-way and you can still tell what comes next. Hold the needle with the stitches in your left hand and look at the side facing you. See Vs? Knit this row. See bumps? Purl this row. A handy trick: clip a locking marker onto the right side of your work near the bottom edge. Whenever the marker faces you, it’s a knit row.
Counting rows is easy too: on the right side, each V is one row. Pick one column of Vs and count upwards from the cast-on (don’t count the loops on the needle).
Quick troubleshooting
| What happened | What to do |
|---|---|
| My stocking stitch curls up like a tube. | Normal. Garments use borders and blocking to keep it flat. |
| A line of bumps appeared on my smooth side. | You knitted a WS row (or purled a RS row). Tink back across the row if you spot it at once, or frog back to it if you find it rows later. |
| My cast-off edge is tight and curls. | Undo it (pull the tail out and put the stitches back on) and cast off (US bind off) again with a needle one size bigger. |
| My rib has extra stitches and little holes. | The yarn went over the needle instead of between the tips when you switched between knit and purl. Tink back to it and drop the extra loop. |
Questions people ask
Is it a mistake if my stocking stitch curls?
No. Stocking stitch always curls: the sides roll towards the back, and the top and bottom roll towards the front. It’s how the fabric is built.
How do I stop my knitting from curling?
Add a border of garter stitch or rib at the edges, and block the finished piece. A few garter stitches at each edge stop stocking stitch curling.
Does blocking stop stocking stitch curling?
Blocking calms the curl down by letting the stitches relax and even out as the piece dries flat. Garments also rely on borders, such as garter stitch or rib, to keep the edges flat.
Which knitting stitches don’t curl?
Garter stitch lies flat, and moss stitch (US seed stitch) is a pebbly, reversible fabric that lies flat and doesn’t curl. That’s why both are used as borders.