You have made the squares. They are counted, arranged and looking rather pleased with themselves. Now comes the question that can stop an entire cardigan: how should they be joined?
For clothing, the prettiest join on a table is only part of the answer. That seam will also sit against your arm, bend at your elbow and travel around your body. It needs to get along with the fabric.
This is a guide to choosing and testing a join. If you are following a garment pattern, start with its assembly instructions: changing the join can change the finished measurements.
First, check what the squares are supposed to become
Lay out the correct pieces and mark the neckline, armholes and sleeve openings. A neat seam in the wrong place is still an impressively neat mistake. Our guide to granny square garment layouts helps you distinguish the motif arrangement from the assembly drawing.
Compare the finished motif measurements and the edges you will join. If the stitch counts or sizes differ unexpectedly, investigate before sewing. Pulling harder is not a reliable sizing method.
Four joining approaches, four different decisions
- A discreet sewn seam: useful when you want the motifs to lead the design. A tapestry needle gives you control over where the joining yarn travels. Look at both sides; “invisible” should describe the appearance, not an imaginary absence of a seam.
- A slip-stitch join: worked with a hook, with the ridge and visibility depending on the placement and loops used. Check that the joining stitches do not draw the edges together too tightly.
- A raised crochet join: a visible seam, such as a single-crochet join, can become an intentional outline around each square. Decide whether you want that outline before adding it to every motif. Here, single crochet means US terminology.
- Join-as-you-go: motifs connect during a specified round rather than all being joined afterwards. It is a construction choice to plan, not simply another seam to apply to a finished stack.
For demonstrations, see Lion Brand's sewn-seam guide and Yarnspirations' comparison of crochet seams. Their examples explain the techniques; your garment pattern determines where they belong.
Let two spare squares answer before fifty do
Make two sample motifs in the project yarn. Try one suitable join, then compare it with another on a separate pair or after carefully undoing the first. Use the intended joining yarn and record the hook or needle and the loops you worked into.
Lay the sample flat without stretching it. Then fold it, drape it over your forearm and turn it over. Is there a firm ridge where you wanted softness? Can the squares bend naturally? Does the seam pull their corners out of line?
Measure across the joined pair as well as across one square. A join that adds space, or takes part of an edge into a seam, can affect a row of motifs. Check the pattern's finished measurements instead of assuming every method gives the same result.
A contrast seam needs a place in the colour plan
A matching joining colour lets the flowers or geometric shapes remain prominent. A contrasting join creates another line in the design. Neither is automatically more polished; the useful question is whether the extra line supports the garment you want.
Photograph a small joined section beside the planned edging colour. If every element is asking for attention, choose which one gets the microphone.
Join in sections you can check
Number the motifs or photograph the layout before lifting them. Work one manageable section, lay it down and compare it with the drawing. Check which side faces out, where the openings remain and how the intersections sit. Avoid stretching one edge to make it reach another.
For a project record that survives a few evenings away, use the granny square garment planning guide. If the joined fabric suddenly feels rigid, the heavy or stiff crochet sweater checklist can help you separate the seam from the fabric itself.
Can you change the join in a pattern?
Sometimes, but first check whether its spacing, last motif round or seam allowance is part of the size calculation. A join-as-you-go construction may require changes before the motifs are finished. Yarnspirations' join-as-you-go guide shows why the connection can be built into the final round.
If the pattern does not explain an alternative, test it and ask a precise question with your motif and joined-sample measurements. Two little squares can save a surprisingly large conversation with the seam ripper.