Seaming techniques
Before you tell me you hate doing seams in crochet, hear me out. There are excellent seaming methods you can use in Tunisian crochet that are almost invisible. If you pick the right method and do it well, your seams will look almost as though you’ve worked in the round.
Back Loop Single Crochet Join
Use this method when joining ribbing on stretchy bands. Use on Tunisian and standard crochet.
Back loop single crochet (US) / back loop double crochet (UK), blsc/bldc, is a really efficient way to seam a strip of ribbing in standard crochet.
This seam is made with your crochet hook, not a needle.
Bound Off Tss Seam
Use this method to sew two pieces of Tunisian simple stitch (tss) that both have a bind off row or foundation chain.
You can use this seaming method to join a foundation chain row to a bound off row, two foundation chain rows or two bound off rows. The application in the photo here is two bound of rows facing each other (the back and front pieces of a top).
Mosaic Edge Seam
Use this method to sew the side edges of two pieces of Tunisian mosaic together.
This seaming method is very similar to a standard seam for side edges of Tunisian Crochet but because it's a seam for two colour mosaic, there are slight tweaks to accommodate for the colour changes.
You will need a darning needle to sew this seam. You can use either of the colours used in the project to sew the seam.
Perpendicular Seam
Use this method to sew a row of Tunisian simple stitch (tss) to the side edges of another piece of Tunisian crochet.
The pink tss block was not bound off. At the end of the return pass, a length of the working yarn was cut and threaded onto a needle and sewn onto the main part of the garment. The main part of the garment (striped) faced at a 90 degree angle to the pink section.
Raw Tss Seam
Use this method when joining two rows of Tunisian simple stitch (tss) together that are not bound off.
This seam is really neat and flat because there is no foundation chain or bind off row to incorporate. This demonstration used two swatches of Tunisian simple stitch (tss). The bottom swatch is facing up the right way and the top swatch was spun upside down.
Attach a darning needle to one of the working yarns and sew the seam directly from that. This avoids adding more ends to sew in.
Side Edges Seam
Use this method to sew the side edges of two pieces of Tunisian crochet together.
This seaming method isn't restricted by stitch. The images I've supplied are side seams on the Gadhu Tee which is a mix of Tunisian simple stitch (tss), Tunisian double crochet (tdc).
Raw edge to foundation row
Use this method to sew a row of Tunisian crochet that is not bound off (a completed forward and return pass without a bind off row), to a foundation row of Tunisian crochet.