Knot

A knot is a round, dark-colored section in a piece of wood where a branch grew. When trees are harvested and processed into lumber, the knots are cut out or left in the wood, depending on the desired final product.

Knots can have different effects on the strength and appearance of the lumber. Small, tight knots may not affect the strength of the wood significantly and can add character to the appearance of the lumber. However, larger knots can weaken the wood and may cause it to split or warp over time.

Therefore, the use of lumber with knots depends on the intended use of the final product and the quality standards of the industry or the buyer.