Burr oak (also called burl oak) is European oak (Quercus robur / Quercus petraea) that has grown with large, irregular growths or “burls” on its trunk or branches.
A burl is a dense, knotted, and twisted growth caused by stress, injury, or infection in the tree. This produces timber with complex, swirling grain patterns that are extremely decorative.
Unlike pippy oak, which has small scattered “pips,” burr oak features large, dramatic figures, often resembling knots, waves, or whirlpools in the grain.
Physical and Visual Characteristics
| Property | Description |
| Species | European Oak (Quercus robur / Quercus petraea) |
| Type | Decorative character timber |
| Grain | Swirling, interlocked, highly figured; sometimes contains eyes, knots, and curls |
| Colour | Pale golden brown to warm honey; darkens with age |
| Density | 700–800 kg/m³ (air-dried) |
| Durability | Heartwood very durable; resistant to decay and insects |
| Texture | Medium to fine, very irregular |
