My Favourite Way to Join Granny Squares: The Flat Slip Stitch Seam

If you’ve been wondering how to join your granny squares in a way that’s neat, smooth, and doesn’t involve any sewing - you're in the right place! Let me introduce you to my favourite technique: the flat slip stitch seam.

Not ready to try it just yet? - Pin it now, make it later!

Jump straight to the pattern!

Why Choose The Flat Slip Stitch Seam?

The flat slip stitch seam is a popular choice for joining crochet pieces, thanks to it's smooth, low-profile finish that frames the motifs beautifully - and best of all - there's no sewing required! This method is easy to learn, quick to execute, and perfect for both beginners and experienced crocheters.

Use a matching yarn for a nearly invisible seam, or try a high-contrast yarn to make the seam a standout feature. It’s amazing how a simple yarn colour change can completely transform the look of your finished piece!

I used this technique to join the squares in my Oatmilk Petals Blanket with a low-contrast yarn, adding just a touch of detail for a subtle, understated finish. But you could just as easily go bold and make the seam really pop with a high-contrast colour.

Not ready to try this technique yet? Pin it now, try it later!

Let's Get Started!

Ready to try the Flat Slip Stitch Seam for yourself? Scroll down for the full step-by-step photo tutorial, or watch the full video tutorial here or on YouTube. And not forgetting about my left-handed crocheters - there’s a LEFT-HANDED tutorial too!"

Happy crocheting!

More of a Visual Learner? Watch The Tutorial on YouTube!

Materials​

• Granny Squares

• Crochet Hook: the same hook you used for your granny squares

• Yarn: The same weight yarn you used for your granny squares

• Scissors

• Yarn needle for weaving in ends

Pattern Notes

• US crochet terms used throughout​

• Before we dive into the step-by-step tutorial, here are a few helpful notes:

  • The right side is always facing up.

  • It is important to ensure that your yarn is always at the back of your work.

  • You will always work through the back loops only (BLO) of your stitches.

  • You will insert your hook into the stitch from front to back.

  • The edge you begin, always goes first.

• There is a video tutorial for this granny square pattern if you find it hard to follow just written instructions. You can find it HERE.

  
  

Abbreviations (US crochet terms)

• BLO = back loop onl

• ch = chain (yarn over, pull through)

• slst  = slip stitch (Insert hook, yarn over, pull through both stitch and loop on hook)

• st/s = stitch/es

Flat Slip Stitch Seam

TIP: Block your squares before joining to ensure they’re even, flat, and uniform in size.

Note: I have decided to use 4 squares, all in different colours, with white yarn to join so you can see the stitches clearly.

Step 1: Select the first two squares that you wish to join and ensure that the right side (the ‘pretty’ side) of your work is facing up.

Step 2: Begin with a slip knot on your hook. Insert your hook from front to back into the BLO of the 2nd ch along the edge your joining. If your square doesn't have any chain spaces, insert your hook into the corner st instead.

Step 3: Insert your hook from front to back into the BLO of the 2nd ch on the second square, going from front to back. Make sure you’re also inserting it into the chain stitch just before the first double crochet along the edge you’re joining.

Step 4: The white yarn (joining yarn) should always be at the bottom of your work. Next, yarn over with the white yarn and bring up a loop through the second square loop, followed by the first square loop.

Step 5: Slip stitch through the first loop on the hook. 1 slip stitch complete! Repeat the process for the second pair of stitches and so on.

Step 6: Continue joining until you reach the corner stitch immediately following the last double crochet on this edge.

Step 7: Bring in squares 3 and 4, and begin joining them in the same way you did with squares 1 and 2 - except this time, there’s no need to make a slip knot on your hook.

Step 8: Continue joining stitches on squares 3 and 4 until you once again reach the corner stitch immediately following the last double crochet on this edge.

Step 9: Continue joining squares until you've completed the desired number across the row (this blanket is 8 squares wide by 10 squares long). Once the row is complete, fasten off. Repeat Steps 1 to 8 until all the horizontal seams are complete (you should have 10 rows in total). Once the rows are finished, you can begin joining the columns (vertical seams).

Step 10: When you're ready to join the columns, follow Steps 1 to 5 again. Continue in the same way until you reach the end of the first square in the column.

Step 11: Make a chain stitch to cross over each row (horizontal) seam as you work down the column. Repeat this every time you need to cross a row join.

Step 12: Continue joining the stitches as normal until you reach the end.

Step 13: Continue joining squares until you've completed the desired number in the column (10 squares for this blanket). Once the column is complete, fasten off. Repeat the steps until all the vertical seams are complete.

This is how the flat slip stitch granny square join looks on the back of your squares.

Pin it for later!

Leave me a comment.

I hope you enjoyed this tutorial on how to join granny squares using the flat slip stitch seam and found it helpful.

Have you tried this joining method? I'd love to hear how it compares to other ways you've seamed your granny squares - share your thoughts in the comments below!

Thank you for stopping by and for your support!

Happy crocheting!

DISCLOSURE: Any affiliate links contained in this blog are marked with *. If you purchase a product through a link on my blog, I receive a small commission from the store. This helps me continue providing free patterns. Visiting the store through my link costs you nothing extra and ensures I get credit for the sale. Thank you for your support!

Share This Post