The Art of Blocking: How to Finish Your Knitting and Crochet
We spend hours choosing patterns and yarn, checking gauge, and carefully working our projects. But when we bind off or fasten off, the finished piece can look less than expected.
Blocking is the step that turns a homemade project into a professionally finished garment or accessory. It is the process of using moisture (water or steam) to relax the stitches, adjust the measurements, and set the fabric into its final shape.
Whether you have knitted a delicate lace shawl or crocheted a stack of classic granny squares, blocking relaxes the fibres and allows them to settle into their final, beautiful drape.
Why Blocking Matters
In both knitting and crochet, stitches are held under varying tension as they are worked. This can cause individual stitches to look slightly uneven.
Blocking does several essential jobs:
- Evens Out Stitches: Water relaxes the yarn, allowing tension to distribute evenly across neighbouring stitches.
- Opens Up Stitch Patterns: Lace, mesh, and textured stitch patterns look compressed on the hook or needle. Blocking stretches these open so the design is visible.
- Corrects Dimensions: It allows you to gently shape your fabric to match the schematic measurements in your pattern.
- Improves Drape: Plant-based yarns like organic cotton, linen, bamboo, and hemp can feel stiff when freshly worked. Moisture relaxes the cellulose structures, making the fabric significantly softer.
Because plant-based fibres lack the natural elasticity and memory of animal wool, they do not automatically spring back into shape. Blocking is the crucial step that coaxes them into their permanent form.
The Three Main Blocking Methods
The method you choose depends on the fibre content of your yarn and the structure of your project.
1. Wet Blocking
This is the most thorough method and is ideal for plant-based yarns (cotton, linen, hemp) and lace projects.
- How it works: Submerge the project in cool water for 15 to 20 minutes. You can use a gentle, eco friendly detergent if required. Press the water out gently by rolling it in a towel (never wring it). Lay it flat on blocking mats, shape it to your desired measurements, and pin it down securely.
- Best for: Shawls, sweaters, blankets, and lace structures.
2. Steam Blocking
Steam blocking is excellent for quickly relaxing fibres and shaping pieces that do not need to be stretched aggressively.
- How it works: Pin your dry project to your blocking mats wrong side facing. Hold a steam iron or garment steamer about 3 to 5 centimetres above the fabric, letting the steam penetrate the fibres. Use your hands to gently pat and smooth the fabric into shape. Never let the iron touch the fabric directly.
- Best for: Joining pieces (like sweater panels) or relaxing highly textured crochet stitches.
3. Spray Blocking
This is a gentle middle-ground method, perfect for lightweight items or delicate stitches that might be distorted by the weight of a full soak.
- How it works: Pin the dry project out to your final measurements first. Use a clean spray bottle filled with cool water to mist the item until it is damp but not soaking wet. Press the moisture gently into the fibres and let it dry.
- Best for: Fine lace, lightweight plant-based tops, and small motifs.
Essential Blocking Techniques and Tools
To achieve the best results, having the right tools makes the process simpler and more precise.
- Foam Blocking Mats: These puzzle-like mats protect your surfaces and provide a grid to ensure your edges are straight.
- T-Pins: Sturdy, rust-resistant stainless steel pins are essential. Standard pins will rust when damp, leaving permanent marks on your yarn.
- Knit Blockers: These plastic combs have multiple needles built in. They allow you to apply even tension along straight edges much faster than individual pins.
- Blocking Wires: Excellent for shawls and blankets. You thread the wire through your finished piece and pin the wire down, resulting in perfectly straight edges.
- Wooden Blocking Boards (Peg Boards): These are wooden boards with a grid of pre-drilled holes and removeable pegs. They are specifically designed for blocking granny squares and small motifs. You insert the pegs at your desired dimensions and stack the damp squares on top of each other, ensuring every single square blocks to the exact same size for easy, neat seaming.
Watch me block a shawlette using Blocking Wires, T Pins and Knit Blockers
Practical Tips for Success
- Weave in ends first, but trim later: Weave in your yarn tails before blocking, but leave a few centimetres loose. The blocking process will shift the stitches. Once the piece is dry, you can trim the tails flush with the fabric without worrying about them popping out.
- Use a grid: If your blocking mats have grid lines, use them to check that your sweater sleeves are the same length and your blankets have square corners.
- Let it dry completely: Do not unpin your work until it is dry to the very core. Removing pins early will cause the fibres to spring back to their unblocked state, losing the shape you worked to create.
Closing Thought
Blocking is often viewed as an extra chore, but it is truly where the craft comes together. It is the bridge between a collection of loops and a finished piece. Take your time, enjoy the slower pace of pinning your work, and utilise the process to bring out the very best in your stitches.
Frequently Asked Questions
Do I have to block my projects after every wash? For plant-based yarns like cotton and linen, yes. These fibres lose their shape when wet. When you wash your garment, you will need to lay it flat and shape it again, though subsequent blocks are usually much faster than the first.
Can I block acrylic or synthetic yarns? Synthetic yarns do not react to water in the same way natural fibres do. You can steam block them, but you must be extremely careful—too much heat will melt the plastic fibres (a process called "killing" the acrylic), permanently flattening the stitch definition.
Do I need to block granny squares individually? Blocking granny squares to the exact same size before joining makes seaming much easier and results in a flat, neat blanket or bag. The peg board style blocking boards are perfect for this.
What is a blocking board? A blocking board is typically a wooden board with pre-drilled holes and metal pegs. It is perfect for stacking and blocking multiple granny squares or crochet motifs to the exact same dimensions simultaneously.
How do I block a circular shawl or crescent wrap? For circular shapes, flexible blocking wires can be threaded through the outer edge and bent into a curve, which you then pin down to hold the circular tension.
Why did my blocked lace shrink back? This usually happens if the project was unpinned before it was 100% dry, or if the fibres were not soaked long enough to fully absorb water and relax.
Is wet blocking better than steam blocking? Neither is inherently better; it depends on the project. Wet blocking is superior for opening up intricate lace and thoroughly relaxing stiff plant fibres, while steam blocking is faster and great for structural pieces.
How do I block a sweater to the correct size? Pin the pieces (front, back, and sleeves) out to the schematic measurements in the pattern before seaming them together. This ensures your pieces match perfectly when you sew them up.
Should I block the individual pieces of a garment before or after sewing them together? Block them before seaming. It makes the edges flat and the stitch rows clear, which makes sewing them together much easier and yields a neater seam.
Can I use a hairdryer to speed up the drying process? It is best to let it dry naturally. A hairdryer can blow the stitches out of alignment or dry the surface while leaving the interior damp. A simple room fan circulating air is a safer option.