Provisional Cast On (Crochet Chain)
A provisional cast on creates live stitches along an edge that can later be unravelled to expose those live stitches for finishing. The crochet-chain method is the most common variant and uses a crochet hook and a strand of waste yarn.
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Method
Make a crochet chain in waste yarn slightly longer than your stitch count. Pick up and knit one stitch into each chain bump along the back of the chain. To unravel later, undo the slipknot at the end of the chain and pull — the chain unzips and exposes the live loops below.
Why it matters
Provisional cast ons make tubular bind-offs, sewn-down hems, and grafted joins possible. Any time a designer says "set aside live stitches" or "graft to the cast-on edge," a provisional cast on is the cleanest method.
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Choosing waste yarn
Use a smooth, strong yarn in a contrasting colour and a similar weight to your project yarn. Avoid wool — animal fibres can felt to the working yarn and refuse to unravel. Crochet thread, mercerised cotton, and acrylic all work well.
Common mistake
Picking up stitches into the front of the chain (the V) instead of the back (the bumps) makes unravelling impossible. Always pick up into the bumps along the back of the chain.
Abbreviation reference
| Abbreviation | Meaning |
|---|---|
| CO | cast on |
| st(s) | stitch(es) |
Tips
- Use a hook one size larger than your knitting needle to keep the chain loose and easy to unzip.
- Make the chain at least four stitches longer than your cast on so you have a clear loose end to start unravelling from.
- Mercerised cotton crochet thread is the cleanest unzip — it slips out without snagging.
In depth
The crochet-chain provisional cast on relies on the fact that a crochet chain is essentially a single column of slipped loops. Each loop along the back of the chain corresponds to a live knit stitch when the chain is unravelled, which is why it is so reliable for grafting.