What is green wood, and why do carvers use it?
Freshly cut wood is a fraction of the effort to cut, splits predictably along the grain, and moves as it dries — which is a problem in furniture and an advantage in carving.
- Difficulty
- beginner
- Time
- 12 min
- Read
- 3 min
Short answer
Green wood is wood that has not dried out, still carrying most of the water it had in the tree. It cuts with a fraction of the effort of seasoned timber, splits cleanly along the grain so blanks can be riven rather than sawn, and shrinks and distorts as it dries. Carvers work it green and let the piece finish drying afterwards.
Almost all modern woodwork uses dried timber, because furniture needs to be dimensionally stable. Green woodworking runs the other way: it takes wood straight from the tree and works it wet, accepting the movement in exchange for how much easier it is to cut and split. It is the older tradition by several thousand years and it is still the pleasanter way to carve.
Step by step
- Understand what makes it different.Freshly felled wood may be half water by weight. That water lubricates the cut and softens the fibres, so a knife or an axe passes through green oak with a fraction of the effort needed for the same wood dried.
- Learn to rive rather than saw.Green wood splits cleanly along its grain with a froe or an axe. A riven blank follows the natural fibre, which makes it much stronger than a sawn one, because no fibre is cut through. This is why riven chair parts and riven shingles outlast sawn ones.
- Split blanks off-centre.The pith at the very centre of a log will nearly always crack as it dries. Split a log in half through the middle and work each half with the pith at the edge or removed.
- Expect the piece to shrink and distort as it dries.A bowl carved green will go slightly oval. A spoon will move a little. This is normal and is part of the aesthetic; it only becomes a problem if the drying is too fast.
- Control the drying rather than preventing it.Slow and even is what stops cracking. A paper bag with the shavings, a cool place away from radiators and sun, and a few weeks. Rushing it splits the piece.
- Store blanks properly if you are not carving them now.Seal the end grain with wax, PVA or old paint, and keep them cool and shaded — or in a sealed bag in the fridge for short periods. End grain loses moisture many times faster than the sides, which is why cracks start there.
- Rough out green, finish dry, on anything that must fit.For a bowl or anything with a joint, carve it oversize while green, let it dry, then take the final cuts once it has stopped moving.
- Know when green wood is wrong.Anything that must stay a precise size — a box, a drawer, a jointed piece of furniture — needs dry timber. Green wood is for carving, riving, steam bending and traditional chairmaking, where the movement is designed in rather than fought.
Tips
- Green wood chairmaking exploits movement deliberately: dry tenons into green mortises, so that as the green wood shrinks it grips the dry tenon tighter over time.
- Wood keeps working as long as it is wet, so a project you leave half finished for a fortnight will not be the shape you left it. Bag it or finish it.
- The best free source is a tree surgeon. Most are glad to give away decent hardwood sections rather than pay to chip them.
Questions people ask
How long does green wood take to dry?
A rough rule for air drying boards is a year per 25 mm of thickness, though a small carved item dries far faster than that because its walls are thin. The point is that it dries at its own pace and hurrying it cracks it.
Can I speed up drying?
Only carefully. Removing the bulk of the wood so the walls are thin and even helps most. A paper bag with the shavings slows and evens the process. Heat, sun and airing cupboards crack things.