Lipa

Overview and range in Europe

Small-leaved lime or linden, Tilia cordata, is the main timber lime of Europe. The European Atlas of Forest Tree Species says it is the more abundant of the two native limes, with a core region in central and eastern Europe, reaching southern Norway and Finland and, in the central Alps, up to 1,500 m. Large-leaved lime (Tilia platyphyllos) has a smaller range and reaches only southern Sweden at its northern limit. EUFORGEN also describes T. cordata as found in most of Europe, favouring well-drained, fertile, loamy soils but also growing on infertile ones, and fairly tolerant of drought and shade.

The Atlas gives tree heights of 30-40 m, trunks up to about 1 m in diameter and a branch-free bole of 10-15 m; it says nothing on rotation age. Limes can live more than a thousand years and coppice well. A third taxon, Dutch or common lime (Tilia x europaea), is a hybrid of the two, planted as a street and park tree and not used for timber, according to the Bavarian LWF article by Grosser and Ehmcke (2015).

For a sawmill, supply is the main characteristic. The LWF text says small-leaved lime is the main forestry species for timber, large-leaved lime is mostly a village tree, supply is sporadic, and free-grown trees are short-boled and coarse-branched, so their wood is often unsuitable for higher-value uses.

The Wood Database notes that Tilia is called lime or linden in Europe and basswood in North America. American basswood (T. americana) is a different species with lighter, softer wood, used here only for labelled comparison.

Appearance and identification

Lime is a "light-heartwood" species: heartwood and sapwood are not distinguished by colour. The LWF article describes whitish to yellowish wood, often with a slight reddish or light brownish tint, occasionally with faint greenish streaks or spots, and a matt sheen. The grain is plain and the texture fine and even. Tangential faces are slightly "flamed" and radial faces are finely striped. Fresh wood has a characteristic soap-like smell (LWF, citing an older source). The Gabarro encyclopedia (Spain) describes yellowish white wood darkening to light brown with age and straight grain.

Anatomy is diffuse-porous. Vessels are very numerous, 70-90 micrometres in tangential diameter, often in short radial groups; the first vessels of each ring can form a rough pore ring. Rays are narrow and fairly widely spaced, forming shiny mirrors up to 2 mm high on radial faces. Growth rings are weakly marked. The decisive microscopic feature is the tight spiral thickening inside the vessels, which allows identification from tiny splinters (LWF).

Separating small-leaved from large-leaved lime in sawn wood is not reliable. The LWF article says they cannot be told apart by structure or workability, although winter lime is often described as slightly heavier, denser and harder; it also says there are no significant differences. Treat them as one product.

Properties that matter

Lime is a soft, fine-textured wood of medium density among European hardwoods. The table lists values I could read in open sources, with region.

Property	Value	Source and region
Density	0.53 g/cm3 at 12-15% MC; range 0.35-0.60	LWF Wissen 78, Grosser and Ehmcke; Germany
Density at 12% MC	530 kg/m3	Gabarro encyclopedia; Europe, no test standard cited
Shrinkage, fresh to oven-dry: longitudinal / radial / tangential	0.3 / 5.5 / 9.1%	LWF; Germany
Volumetric shrinkage	14.4-14.9%	LWF; Germany
Differential shrinkage per 1% MC (5-20%)	radial 0.15-0.23; tangential 0.24-0.32%; T/R about 1.6	LWF; Germany
Modulus of elasticity (bending)	7,400 N/mm2	LWF (DIN 68364 and other cited sources); Germany
Bending strength	90-106 N/mm2	LWF; Germany
Compressive strength parallel to grain	44-52 N/mm2	LWF; Germany
Tensile strength parallel to grain	85 N/mm2	LWF; Germany
Brinell hardness	37-41 and 13-20 N/mm2 (labels for the two values unclear in the text)	LWF; Germany
Impact bending work	50 kJ/m2	LWF; Germany
Extractives	up to about 10%	LWF; Germany
American basswood, T. americana (comparison)	415 kg/m3 average dried; Janka 1,820 N; MOR 60 MPa; MOE 10.07 GPa; crushing 32.6 MPa; shrinkage R / T / vol. 6.6 / 9.3 / 15.8%	Wood Database; North America, different species

Notes. The LWF text labels density "basic density" while quoting 12-15% moisture, so I treat it as air-dry density; Gabarro's 530 kg/m3 at 12% agrees. Gabarro also quotes bending strength 600 kg/cm2 and modulus of elasticity 102,500 kg/cm2, roughly 59 MPa and 10 GPa after conversion (my conversion, conditions unknown). The bending figure is far below LWF's 90-106 N/mm2 and I could not resolve the difference. Gabarro's compression figure was clearly inconsistent and is not reproduced.

The qualitative picture agrees across sources: LWF calls lime soft, tough, low in elasticity and low in strength and load-bearing capacity. It is one of the more strongly shrinking domestic hardwoods, yet stable after drying because radial and tangential shrinkage are close; the Wood Database says the same of basswood (considerable shrinkage during initial drying, stable in service). A 2024 Holzforschung study of Tilia cordata from three German locations found relatively small hygro-expansion anisotropy, and that stiffness and strength fall substantially between 10% and 20% moisture (for example, longitudinal compression yield stress down about 32%). The abstract did not give density or shrinkage values.

Sawing and log handling

I found no open source describing log storage, sawing patterns, yields or saw settings for European lime; LWF states this is not covered. What the sources support is limited:

• Lime saws and planes easily with all tools (LWF).
• Free-grown trees are short-boled and coarse-branched (LWF), so expect knots and irregular logs; sorting for the intended product, usually carving blanks, matters (inference).
• Iron contact in damp conditions causes grey-black staining and corrodes the iron (LWF). Stickers, banding and fittings deserve attention (inference).

No source gives a thickness or grade rule for carving stock, and I am not inventing one.

Drying

No open source I could read gives a kiln schedule for European lime. The LWF article gives no drying schedule, defects or kiln recommendations, and the Gabarro page says only that no difficulties are noted, without a schedule. The USDA Forest Products Laboratory kiln schedule chapter lists basswood (American) with "standard" and "light colour" variants, but the schedule codes and times did not survive text extraction, so none can be quoted. A Russian study from Voronezh (Chernyshev and Efimova, 2015) on drying uncut lime lumber in convective chambers without artificial humidification is in the open literature, but only its abstract was available to me and the modes and results were not.

What can be said:

• Lime shrinks relatively strongly (volumetric 14.4-14.9%) but the radial/tangential difference is small (T/R about 1.6, LWF), so dried boards keep their shape. American basswood is similar (volumetric 15.8%, T/R 1.4; Wood Database).
• Pale wood is easily marred by iron contact (LWF); the stain risk from slow drying is my inference.
• Stiffness and strength change markedly between 10% and 20% moisture (2024 study), so final moisture matters for tight-tolerance blanks.
• LWF stresses very high susceptibility to wood-destroying beetles, especially the common furniture beetle, so stored stock needs attention.

Because lime schedules are undocumented in the sources I could open, trial charges are needed; that is advice, not a verified schedule.

Machining, gluing and finishing

Machining is the species' great strength. LWF says it works very easily and cleanly with all tools: sawing and planing are easy, carving and turning are excellent in every grain direction, and peeling and knife work are good. It splits easily, but not into smooth surfaces. The Wood Database says the same of American basswood, calling it one of the most suitable species for hand carving, with poor steam bending and poor nail holding. Gabarro lists no difficulty with planing, gluing, finishing, nailing or screwing.

Fastening and gluing are less straightforward than the machining. LWF says nail and screw joints hold well, but glue bond strength is "partly unsatisfactory". The Wood Database, for basswood, says it glues well. These are not strictly contradictory (different species, different tests), but they mean an adhesive trial is sensible before committing to production gluing of lime panels or laminates.

Surface finishing is easy: LWF reports that surfaces polish without difficulty, take dyes and stains excellently and cause no problems with lacquers, and the wood is used as a walnut or cherry imitation in period-style furniture. Contact with iron in damp conditions causes grey-black discolouration (LWF). Despite extractives of up to about 10%, the wood is otherwise described as chemically inactive.

Durability and treatment

Lime is not a durable wood. The LWF article rates its natural durability against wood-destroying fungi, when exposed to weather, as low and classifies it as durability class 5 under DIN EN 350 (2014-12), the least durable class. Class 5 is therefore the only EN 350 class I could verify from an open source, and it is a German-language secondary summary of the standard, not the standard itself. The Gabarro encyclopedia describes the wood in general terms as durable, which conflicts with the LWF classification; I give more weight to the numeric class and treat the Gabarro wording as unsupported.

LWF also says lime is very susceptible to beetles, especially the common furniture beetle (Anobium punctatum), and that few older sacred artworks are free of infestation. Gabarro says the sapwood can be impregnated but the heartwood cannot, although with the lack of colour distinction it is unclear how that distinction is applied in practice, and I could not verify it against another source. I found no open data on preservative uptake or treatment standards for European lime.

Lime should be kept dry and indoors; where insect attack is a risk, treatment or controlled storage must be considered (inference).

Typical uses and market notes

Carving and turnery are the traditional core. LWF names sculpture (Riemenschneider and Veit Stoss, for whose work lime gained the name "lignum sacrum"), religious figures, carnival masks, marionettes, hand-puppet heads, cuckoo-clock fronts and relief carving. Other uses include carved furniture parts, mouldings and panel inserts, spiral-staircase cores, beehive frames, saw-frame spines, brush handles, hat and wig-maker blocks, drawing boards, architectural models, casting patterns, toys, household goods, picture frames, clogs and drawing charcoal. EUFORGEN and the Atlas also mention musical instruments, rope from the bast, and (Atlas) bows and shields historically. Gabarro lists sculpture, carving, instrument bodies, veneer, plywood and paper pulp, and the Wood Database lists carving, lumber, guitar bodies, veneer, plywood and pulp for American basswood.

On the market, the one quantified statement is an earlier estimate by Grosser and Teetz (1998), quoted by LWF: annual lime consumption in sculpture and carving of up to 5,000 m3, with real demand clearly higher. The article says Weymouth pine and Swiss stone pine are often used for carving instead because they are easier to obtain. I found no open price data for European lime lumber and give none. The Wood Database prices American basswood in the lower range for domestic hardwoods, with large carving blocks costing more; that is a North American statement and should not be transferred to Europe.

What is uncertain or varies

• Bending strength: LWF gives 90-106 N/mm2, whereas Gabarro's value converts to about 59 MPa. Brinell hardness labels are unclear in LWF. Density wording is ambiguous.
• No log-handling, sawing-yield or kiln-schedule data for European lime were found in open sources; USDA basswood schedule tables were not readable.
• The DIN EN 350 class 5 comes from a German-language article summarising the standard; Gabarro's wording is inconsistent with it.
• The market volume (5,000 m3) is a 1998 estimate. Prices were not found.
• Small-leaved and large-leaved lime are not reliably distinguishable in wood, so data labelled "lime" or "linden" may include both.
• American basswood data (Wood Database) are for a different species with lower density and are shown only for comparison.

Key points

• Treat lime as a pale, soft, fine-textured, light-heartwood hardwood with air-dry density around 530 kg/m3 in the two European sources.
• It is the supply, not the processing, that is difficult: logs are sporadic, often short-boled and branchy.
• It machines, carves and turns superbly, stains and polishes well, but glue joints can be unsatisfactory, so test adhesives.
• Shrinkage is fairly high but the tangential/radial difference is small, so dried lime stays in shape.
• Durability class 5 (DIN EN 350, per LWF) and high beetle susceptibility mean indoor use only, with controlled storage.
• No kiln schedule or sawing yield was verified; do not copy American basswood numbers across.