Blocking is wetting or steaming a finished crochet piece and pinning it to shape while it dries. It evens out uneven stitches, opens up lace so you can see the pattern, and makes pieces that should match actually match.
It takes twenty minutes of work and a night of waiting, and it is the biggest visual difference you can make to a finished project for almost no effort.
The three methods
Wet blocking
Soak the piece in cool water for fifteen minutes or so. Lift it out supporting its weight, squeeze gently — never wring — and roll it in a towel to press out more water. Pin it to shape and leave it until completely dry, which can be a full day for something thick.
This is the strongest method and the right one for wool and cotton.
Spray blocking
Pin the dry piece to shape first, then mist it thoroughly with a spray bottle until damp all the way through. Leave to dry.
Gentler and easier to control, and much better when you don't want a piece to stretch under its own wet weight.
Steam blocking
Pin the piece out, then hold a steam iron an inch or two above it and let the steam do the work. Do not let the iron touch the fabric. Move it slowly across the surface and let everything cool before unpinning.
Fastest of the three, and the only thing that has any lasting effect on acrylic.
What your fibre will and won't do
- Wool blocks beautifully and holds it. It is the most rewarding fibre to block.
- Cotton blocks well and mostly holds, though it can relax a little over time.
- Acrylic does not hold a wet block at all. It dries and springs straight back. Steam is the only thing that changes it — and be careful, because enough direct heat permanently flattens acrylic into a limp, drapey fabric. Some people do this deliberately; it is often called killing the acrylic. It cannot be undone, so test on a swatch first.
- Blends behave roughly in proportion to their natural fibre content.
When not to block
- Amigurumi and stuffed toys. You want that fabric dense and three-dimensional. Blocking works against everything you were trying to achieve.
- Bags and baskets that need to stand up. Stiffness is the point.
- Anything you'll wash differently later. Block the way the finished item will be treated, or the first wash will undo your work.
What you actually need
Foam blocking mats and T-pins are ideal, but a thick towel on a spare bed and any rustproof pins will do the job. The only two things that really matter: the pins must not rust onto your work, and you need a tape measure so you're pinning to a size rather than to a guess.
Pin generously. Pins every inch or so give a smooth edge; pins every four inches give you a scalloped one.
The granny square trick
If you take one thing from this: block your squares before you join them, and block them all to the same measurement.
Squares made over several weeks are never quite identical — tension drifts with your mood, the time of day and how tired your hands are. Joined unblocked, those small differences fight each other and the finished blanket ripples at the edges.
Pin them all out to one size, dry them, then join. The seams go together without easing, and the finished piece lies flat. It is worth the extra evening on anything made of squares, like our Daisy Granny Square Baby Blanket or the Granny Square Tote Bag.
Where it matters most
Garments, because fit depends on the finished measurements — see our tops and cardigans. Lace and openwork, where blocking is what reveals the pattern. And crocheted flowers and leaves, which look limp until they're pressed flat, as in our plants and flowers patterns.