How to Block Crochet: Wet, Spray and Steam Blocking for Every Yarn
Blocking is the finishing step that makes crochet flat, square and even. Which method suits which yarn (wet for wool and cotton, steam for acrylic), what you need, and step-by-step instructions for squares, blankets and lace.
Pattern at a glance
US terms- Skill level
- Beginner
- Time
- 20 minutes plus drying
You'll need
- Foam blocking mats or a folded towel
- Rust-proof pins
- Spray bottle
- Tape measure
- Steam iron (for acrylic)
In this post
Blocking means wetting or steaming finished crochet and pinning it to the exact shape and size you want while it dries. It evens out stitches, flattens curling edges, squares up granny squares and opens up lace. Use wet blocking for wool and cotton, steam blocking for acrylic, and spray blocking for a quick touch-up.
The rest of this post is just below — free, as always.
Which method for which yarn?
| Yarn | Method | Result |
|---|---|---|
| Wool, alpaca, cotton, linen | Wet blocking | Permanent until the next wash |
| Acrylic | Steam blocking | Permanent (relaxes the fibre — test first) |
| Blends | Spray or gentle steam | Good |
| Thread lace and doilies | Wet + spray starch | Crisp |
Wet blocking
- Soak the piece in cool water with a drop of wool wash for 15–20 minutes.
- Squeeze out the water gently (never wring) and roll it in a towel.
- Lay it on blocking mats. Measure and pin the corners first, then the middle of each side, then every inch or two along the edges.
- Let it dry completely — 12 to 24 hours. Unpin.
Steam blocking (acrylic)
- Pin the dry piece to size.
- Hold a steam iron 1–2 inches above the fabric — never touch it — and steam each section for a few seconds.
- Let it cool and dry before unpinning. Go gently: too much heat makes acrylic limp and shiny.
Spray blocking
Pin the dry piece to size, mist it until damp with a spray bottle, smooth it with your hands and let it dry. Great for granny squares and small fixes.
Blocking tips
- Block granny squares to the same size before joining — it makes joining far easier (joining granny squares).
- For a doily or mandala, pin every picot (doily pattern).
- Blocking flattens texture: don't stretch bobbles, puffs or amigurumi.
- It fixes slight curling and leaning, but not a wrong stitch count (curling, curving).
Common questions
Do I have to block crochet?
Not always, but it makes a big difference for squares, blankets, lace and garments. Amigurumi and bags rarely need it.
Can you block acrylic yarn?
Yes, with steam. Wet blocking doesn't change acrylic much. Steam relaxes it permanently, so test on a swatch first.
What can I use instead of blocking mats?
A folded towel on a carpet or bed, a foam play mat or a corkboard, with rust-proof pins.
Wet, steam or spray — which do you use most? 💧
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