September Knot

We’ve reached September so it’s time for a new Celtic Knot square! The design for September Knot showcases the classic Triquetra (or Trinity Knot), which is a three-arched symbol, on all four sides of the square joined in the middle.

This design is a lot less decorative than some of my other squares but because I used less creative liberties it may appeal to a different group of people. I’m interested in finding out which square has been everyone’s favorite so far!

As always, these large Celtic Knot squares can be crocheted using one of two techniques: interlocking crochet or overlay mosaic crochet. You’ll receive the full written pattern and charts for both techniques. Read on for more details!

NEW! Third Option!

In addition to the original interlocking crochet option and center-out overlay mosaic crochet option, as of November 2023 I’ve now added a bottom-up overlay mosaic crochet option!

This version of each Celtic knot square will require you to cut your yarn at the end of each row. The fringe that gets created can either be a style feature or hidden in an envelope border. Some people choose to weave in the ends instead.

Or you can use this new file for tunisian mosaic crochet if you don’t want to deal with the cut ends on the sides.

I plopped my squares on the lush grass in a nearby park and found some mushrooms growing!

The kids played in the rain while I took a few quick shots of my September Knot squares.

My photoshoot in the park turned into a very wet event and I didn’t get to take photos of all nine of the current Celtic Knots. I’ll leave them packed in the duffel bag (hiding under the squares) and try again later.

Keep an eye on my instagram for those group shots!

Read on for more details

Interlocking & Mosaic Crochet

Each Celtic Knot design comes with the full written pattern and chart for two colorwork techniques: interlocking crochet and overlay mosaic crochet. 

As of the end of November 2023 you can work the overlay mosaic crochet option from the bottom-up or the center-out.

Click here to go to my tutorials for these crochet techniques.

Interlocking Crochet

The interlocking crochet version is done from the bottom-up.

All of the Celtic Knots squares are on a chart size of 81 x 81. This means they begin with 40 windows in the foundation row and will finish to about 20″ square.

Center-Out Overlay Mosaic Crochet

The overlay mosaic crochet version is done from the center-out so we don’t have to worry about any cut ends when we join our squares!

The mosaic crochet charts have been adjusted from their interlocking crochet counterparts. They are solid (there are no interlocking mesh dots on it) and they do not have the unnecessary border lines.

The full chart is 77 x 77 and will finish to about 19″ square. Take note, you’ll receive the top 1/4 of the x-marked chart that gets repeated for all 4 sides of the square.

This bottom-up mosaic crochet sample was crocheted by Divya Tellakula. The knot & the first color used, the Main Color (MC) was yellow and then yellow was also used for the envelope border (to hide the cut ends).

Bottom-Up Overlay Mosaic Crochet

As of November 2023 I have added a third file to each Celtic knot square: the bottom-up overlay mosaic crochet option.

This option also uses a solid chart, 77 x 77, but the gauge is slightly different than the center-out option so your finished square (without the optional envelope border) will be 22” x 21” / 56cm x 52cm.

Celtic Knots

This year’s Celtic Knots series of squares was a lot of fun to draw up and design! It was fun to look for inspiration throughout history. September’s design uses the Triquetra (or Trinity Knot). This knot is one of the classics. I enjoyed this article:


I’m so thankful for my testers! I love having such a variety of colored squares to show you for inspiration! The 2023: A Year of Knots was tested by Altona Newcombe, Angela Kermack, Ann Walter, Anonymous Squirrel, Brandi, Chantal Lariviere, CrochetCarob, cyncitycrochets, Divya Tellakula, Eva, Heather Passmore, Just Duckie Crochet, Kami, MadeByMrsJones, Maja Serec, Margaret Maillet, Marijke Laenen, Pleva, Roxy’s Yarnstitchery, ScorpiosHook, Tehzeeb Mahil, & Wolsalon.

September Knot Pattern Details

This information can also be found on the Ravelry listing (not just for September Knot – I include this info on the listing for every pattern) but I like to include it here on my website as well.

Interlocking crochet / LFM crochet file includes:

– line-by-line instructions- instructions on reading a chart
– a one-page chart

Interlocking Crochet Details

  • Chart is 81 x 81
  • Gauge: 8 (dc, ch) x 8 rows = 4”
  • 20″ x 20″ / 51cm x 51cm
  • 4.5 mm hook (US7)
  • Worsted weight yarn (490 – 565 yards total)
    • Main color (MC) (knot) – 250 yards plus 75 for optional border
    • Accent color (AC) (background) – 240 yards

Center-Out Overlay Mosaic Crochet file includes:

– line-by-line instructions
– instructions on reading a chart
– a one-page chart marked with X’s for mosaic crochet

Center-Out Mosaic Crochet Details

  • Chart is 77 x 77
  • Gauge: 16 sc blo stitches x 16 rows = 4”
  • 19″ / 48cm
  • 5 mm hook (H-8)
  • Worsted weight yarn (600 yards)
    • Main color (knot) – 260 yards
    • Contrasting color (background) – 340 yards

Bottom-Up Overlay Mosaic Crochet file includes:

– line-by-line instructions
– instructions on reading a chart
– a one-page chart marked with X’s (good for viewing on a screen)
– a four-page chart marked with X’s (better for printing)

Bottom-Up Mosaic Crochet Details

  • Chart is 77 x 77
  • Gauge: 14 sc blo stitches x 15 rows = 4”
  • 22″ x 21″ / 56cm x 52cm
  • 5 mm hook (H-8)
  • Worsted weight yarn (600 – 850 yards)
    • Main color (knot) – 260 yards
    • Contrasting color (background) – 340 yards
    • Optional envelope border – 250 yards

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