Heartwood refers to the inner layer of a wood stem wholly composed of non-living cells. It is usually differentiated from the outer enveloping layer (sapwood) by its darker colour, and is more decay resistant than sapwood.

The oldest wood of a tree, extending from the center of a log to the sapwood. The heartwood is the densest, strongest, and darkest wood in a log.

The center of the tree trunk, it is composed of dead xylem cells. (The dead cells are less robust than live cells, so the heartwood sometimes rots, leaving a hollow tree.)

The centre portion of a tree consisting of mature wood that has stopped growing. Generally distinguishable from sapwood or the growing outer portion by its darker colour.

The hard, central wood in the trunk of a tree, containing comparatively little moisture and no sap. See also Sapwood.

Slightly harder and darker wood at the center of a tree.

The darker section of wood extending from the pith, or center of a tree, to the sapwood. Unlimited amounts allowed in most wood grades.

central cylinder of nonfunctional xylem in a woody stem (see sapwood)

The inner core of a woody stem, where the cells no longer participate in the life processes of the tree. Usually contains extractive materials that give it a darker color and greater decay resistance than the outer enveloping layer (sapwood).

The inner of two distinct wood layers in the trunk of many trees. The outer layer, usually lighter and moister, called sapwood, is newly formed wood with some living cells. Inside this ring of sapwood is often a darker, harder, more durable core called heartwood. A striking example of heartwood and sapwood difference is found in Dalbergia melanoxylon, which has light brown sapwood and purple black heartwood; it is often used for craft carving.     The wood in the centre of a tree, no longer in use for conducting water from the roots to the leaves. It is often darker in colour than the outer wood (sapwood) and may contain chemicals that make it more resistant to decay.

The dark wood in the center of trees which is full of resins etc, making it more durable than the sapwood.

Heartwood is the xylem in the center of the tree that has stopped conducting water and minerals and is storing waste products from the plant. These waste products are of various types. In redwood trees these materials causes the heartwood to turn red. These products help to preserve the wood, particularly in redwoods. Heartwood can be contrasted with Sapwood, particularly in redwoods, because the heartwood is red and the sapwood is white. The sapwood is the portion of the xylem that is conducting water and minerals and hasn't started storing waste products. DIAGRAMS: Heartwood / Heartwood PHOTOS

The hard inner core and oldest part of a tree. It is denser and darker than the outer layers of sapwood, and does not contain living cells; as the tree grows, the area of heartwood increases.

In a cross section of a log, the heartwood is the centre and dead portion where growth rings appear. This area, between the pith and sapwood may contain phenolic compounds, gums, resins and other material that usually make it darker and more decay resistant than sapwood.

The inner layers of wood which, in the growing tree, have ceased to contain living cells.

The darker inner core of a woody stem or log.

The inner core of a woody stem, wholly composed of nonliving cells and usually differentiated from the outer enveloping layer (sapwood) by its darker color.

The dark-colored center of a tree's cross-section, consisting of blocked xylem cells.

The older, harder wood in the middle of a tree trunk that can no longer transport water up to the leaves. This wood is often saturated with decay-protecting chemicals that also make it a different color from the outer wood. [KR

In a cross section of a log, the heartwood is the center and dead portion where growth rings appear. Also see bark and sapwood.

The inner core of a mature log, usually darker in color that the sapwood.

the older inactive central wood of a tree or woody plant; usually darker and denser than the surrounding sapwood

The wood from the pith extending to the sapwood, darker in colour due to gum, resins, and other materials which make it less susceptable to rot.

The wood extending from the true centre to the sapwood, and whose cells no longer participate in the life processes of the tree. Heartwood may contain gums, resins, and other materials that usually make it darker and more decay resistant than sapwood.

Wood from the interior portion of a tree. Generally darker in appearance and harder than sapwood.

The area next to the pith, which is composed of deal cells and serves as support

hard central wood consisting of dead cells that give strength to the tree (usually darker in color)

Most of the section of the log with the exception of the sapwood and the pith.

inner wood (nonfunctioning xylem) that gives strength to the trunk.

This term refers to the wood that surrounds the very center of the tree, called the pith, and which extends out to the living and growing wood on the outside of the tree called the sapwood. This wood is not alive and does not conduct water and nutrients; that function is performed by the sapwood. Heartwood is usually darker in color than is the sapwood.

The center portion of a tree. It is made up of mature wood that has stopped growing. Its darker color usually makes it distinguishable from sapwood, the growing, outer portion.

the older, harder, nonliving central wood of a tree that has ceased to conduct sap and serves the sole function of support; heartwood is created as the sapwood moves farther away from the active growth region of the tree and dies; it usually is darker, denser, less permeable, and more durable than the surrounding sapwood.

This is the dead inner core of a tree. It is usually much harder and darker than the newer wood.

Wood located in the centre of the trunk and often darker in colour than the surrounding wood

A dead portion of a tree, no longer producing sap. The wood from the center of the tree (pith) to the wood which produces sap (sapwood).

Inner rings of xylem that have become clogged with metabolic by-products and no longer transport water; visible as the inner darker areas in the cross section of a tree trunk.

Heartwood is wood that may contain deposits of minerals that may result in streaks of much darker colors than the sapwood portions of the tree area closest to the bark.

The inactive, nonconducting tissue of the center of a tree trunk or branch.

The inner portion of the log that dies. Its is generally darker in color than sapwood.

Older, harder, non-active core of a tree. More durable than sapwood. Heartwood is much darker in color than sapwood.

the inner core of a woody stem composed of nonliving cells and usually differentiated from the outer wood layer (sapwood) by its darker colour. See Cambium.

the central part of a tree that is no longer active in the transport or storage of water or nutrients.

The inner core of a tree trunk or stem that no longer conducts sap. Heartwood is not alive, but it does serve as a skeletal support for the living tree. Sometimes heartwood is decay and/or insect resistant.

This is the fully developed mature section in the centre of the tree. Due to the gum or resin contained in the wood cells it is usually darker in colour than sapwood. Its main function is to support the tree as it is inactive (ceased growing).

The portion of the tree contained within the sapwood; this term is sometimes used to mean the pith. The heartwood is dormant and unnecessary for the trees growth, but important to its stability. The living part of the tree is in its outer parts.

the inner part of the wood; also called duramen.

The central core of wood in a tree that no longer produces sap and tends to be dark in color.

Wood toward the center of a stem or root that has become physiologically inactive. Heartwood is often darker than sapwood and often more resistant to decay. It no longer functions for the transport of water and nutrients, but may be a site for storage.

The central core of wood in a tree that no longer conducts sap or has living tissues. In some species, the build-up of extractives in the heartwood darkens the wood color in this area.

The central portion of a tree trunk.

the older, harder, nonliving central portion of wood of some trees that is usually darker, denser, less permeable, and more durable than the surrounding sapwood; many trees do not form a true heartwood

The inner layers of wood in growing trees that have ceased to contain living cells. Heartwood is generally darker than sapwood, but the two are not always clearly differentiated.

The wood making up the centre part of the tree, beneath the sapwood. Cells of heartwood no longer participate in the life processes of the tree. Heartwood may contain phenolic compounds, gums, resins, and other materials that usually make it darker and more decay resistant than sapwood

The older, inactive central wood of a tree or woody plant, usually darker and harder than the younger sapwood.

Nonactive core of a log generally distinguishable from the outer portion (sapwood) by its darker color.

The wood extending from the pith to the sapwood, the cells of which no longer participate in the life processes of the tree

Wood found at the center of a tree and distinguished from sapwood by being darker in color due to the extractives it contains.

The inactive cells of the inner tree, located below the Sapwood. The cell cavities of the heartwood may contain deposit which make it darker in color that the sapwood.

the inner part of a tree not involved in the active life cycle, as opposed to the living sapwood.

The non-active center of a tree generally distinguishable from the outer portion (sapwood) by its darker color.

Wood near the center of a tree that is harder, stronger and usually more rot-resistant than wood closer to the outside.

(Sapwood, Xylem) The central part of the tree's stem (trunk), it provides support. No longer contains any live cells.

The central core of a tree, consisting of non-functioning tissue which is rich in tannins/extractives. The heartwood is often darker than the outer sapwood and generally denser and less absorbent.

The central core of a tree, which is made up of dense, dead wood and provides strength to the tree.

The dead inner core of a tree. Usually much harder and darker than the newer wood. Also see sapwood.

Central mass of tissue in tree trunks; contains no living cells but functions as mechanical support.

The dense and often dark-coloured wood that lies in the inner part of the trunk or branch that is devoid of living cells. Toxic waste materials are usually deposited in the heartwood giving it durable qualities.

Inner, nonfunctional xylem tissues that provide structural resistance to the trunk.

Heartwood is the older, harder central portion of the tree. It usually contains deposits of various materials that frequently give it a darker color than sapwood. It is denser, less permeable and more durable than the surrounding sapwood.

The hard nonliving wood at the core of a tree trunk, usually dark in color and impervious to air and water

The inner part of exogenous trees that normally does not contain living cells.  Also called true wood.

The densest, hardest part of a tree trunk located deep within the tree. The outer wood is sapwood which drys at a different rate.

The nonactive or dormant center of a tree generally distinguishable from the outer portion (sapwood) by it's darker color.

The wood of a tree that reaches from the pith (the soft core or center) to the sapwood (where cells have hardened). This wood may contain phenoloic compounds, gums, resins, etc. making it darker and more decay resistant. Redwood is an example of a wood that is used specifically for its durable qualities.