Curling happens because stockinette stitch naturally wants to roll inward

The edges of your knitting curl because stockinette stitch—the smooth V-pattern most knitters use—pulls itself into a tube. The knit side (the Vs) and the purl side (the bumps) have different tensions. The knit side is tighter, so it wins the tug-of-war and the fabric rolls toward it. This is not a mistake you made. It is how the stitch is built.

The curl happens most noticeably at the top and bottom edges of a flat piece, and along the sides. If you are making a scarf or blanket in stockinette alone, the edges will curl up like a scroll no matter how carefully you knit. The only way to stop it is to change what you are knitting, not how you are knitting it.

Different stitches curl differently. Garter stitch (knit every row) does not curl at all. Reverse stockinette (purl side facing out) curls the opposite direction. Ribbed patterns and textured stitches resist curling because they do not have the same tension imbalance.

Key Takeaways

  • Stockinette stitch curls because the knit side is tighter than the purl side, and the knit side pulls the fabric inward.
  • Curling at the edges is not a tension problem or a mistake—it is how stockinette behaves, and it happens to every knitter.
  • A border of garter stitch, ribbing, or seed stitch around the edges will anchor the stockinette and stop it from rolling.
  • If you are making a garment, seaming the sides together stops the curl because the edges are no longer free to roll.
  • Blocking with steam or water can temporarily flatten curled edges, but the curl will return after washing unless you have changed the stitch structure.

Add a border to hold the edges flat

The most common fix is to knit a border of a non-curling stitch around the edges of your piece. Garter stitch (knit every row) is the easiest choice. You can pick up stitches along the edge of your stockinette and knit 5 to 10 rows of garter stitch all the way around. The garter stitch does not curl, and it anchors the stockinette so the whole piece stays flat.

Ribbing also works well. A 1x1 rib (knit one, purl one) or 2x2 rib (knit two, purl two) around the perimeter will hold the edges down. Seed stitch (alternating knit and purl in a checkerboard) is another option. The border does not have to be thick—even 3 or 4 rows is enough to stop most curling.

If you are planning to add a border, you can account for it before you cast on. Instead of casting on the exact width you want, cast on wider and plan to lose some width to the border. Or cast on your exact width and accept that the border will make the piece slightly smaller.

Seaming the sides stops curling on garments

If you are knitting a sweater, cardigan, or any garment where the sides will be sewn together, the seam itself stops the curl. Once the side edges are joined, they are no longer free to roll inward. This is why many sweater patterns use stockinette for the body even though it curls—the seaming takes care of it.

The top and bottom edges still need a solution. Most patterns include a ribbed cuff at the wrists and a ribbed band at the hem for this reason. The ribbing serves a practical purpose: it stops the curl and it also keeps the garment from stretching out of shape during wear.

If you are making a flat piece like a blanket or scarf that will not be seamed, you cannot rely on seaming to fix the curl. You will need a border or a different stitch choice.

Blocking can flatten curled edges temporarily

Blocking with water or steam will flatten curled edges while the fabric is wet and pinned down. Soak your finished piece in cool water for 15 to 30 minutes, gently squeeze out the water (do not wring), and pin it flat to a blocking board or towel. Let it dry completely—this can take 24 to 48 hours depending on the yarn weight and fiber content.

Blocking works because the fibers relax when they are wet. However, the curl will return after you wash the piece again, because the tension imbalance in stockinette stitch is permanent. Blocking is a temporary solution, not a permanent fix. If you want the piece to stay flat after washing, you need to change the stitch structure with a border or seaming.

Some fibers hold a blocked shape longer than others. Wool and wool blends respond well to blocking and hold the shape for several washes. Acrylic and cotton are less reliable—the curl often comes back after the first wash.

Choose a different stitch if you want no curling at all

If you do not want to add a border or seam your piece, the simplest solution is to use a stitch that does not curl. Garter stitch is the most straightforward—it lies flat and looks the same on both sides. It takes longer to knit than stockinette because you knit every row, but the result is a fabric that will never curl.

Seed stitch also lies flat and has a textured, woven appearance. It is slightly faster than garter stitch but still slower than stockinette. Ribbed patterns (1x1, 2x2, or wider) are another option and they have a stretchy, structured look.

Moss stitch (a variation of seed stitch) and broken rib patterns also resist curling. If you like the look of stockinette but want a flat fabric, you can use stockinette for the main body and switch to garter or ribbing for the edges—this gives you the best of both.

Tension and yarn weight do not cause curling

Curling is not caused by knitting too tightly or too loosely. You might read that loose tension prevents curling, but that is not accurate. Stockinette will curl even if you knit it very loosely. The curl comes from the stitch structure itself, not from how hard you pull the yarn.

Yarn weight also does not prevent curling. Thin yarn, thick yarn, and everything in between will curl if you use stockinette stitch. A heavier yarn might curl less noticeably because the weight of the fabric holds it down slightly, but the curl is still there.

If your edges are curling more than you expected, the cause is the stitch, not your technique. Adjusting your tension will not fix it. You need to add a border, seam the piece, or choose a different stitch.

Frequently Asked Questions

Will my stockinette scarf stop curling if I just wash it differently?

No. Washing method does not change how stockinette stitch behaves. The curl will return after every wash unless you add a garter stitch or ribbed border around the edges. Blocking can flatten it temporarily, but that is not a permanent solution.

Can I fix curling by knitting the edges tighter?

No. The curl comes from the stitch structure, not from loose tension. Knitting tighter will not stop it. You need to add a non-curling stitch like garter stitch or ribbing around the perimeter to anchor the stockinette.

Why does the top of my sweater curl but the sides do not?

The sides do not curl because they are seamed together. Once the edges are joined, they cannot roll. The top curls because it is a free edge. Adding a ribbed neckband or collar will stop the curl at the top, just like the seam stops it on the sides.

Is curling a sign that I made a mistake?

No. Curling is how stockinette stitch works. Every knitter who uses stockinette sees this. It is not a mistake—it is the nature of the stitch. The fix is to plan for it by adding a border, seaming, or choosing a different stitch.

Can I use fabric stiffener to keep the edges flat?

Fabric stiffener will hold the edges flat while it is wet, but it will wash out. Once you wash the piece, the curl will return. A structural fix like a garter stitch border is more reliable than a chemical treatment.