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the central, woody core of a tree, no longer serving for the conduction of water and dissolved minerals; heartwood is usually denser and darker in color than the outer sapwoodsapwood,
relatively thin, youngest, outer part of the woody stem of a tree, the part that conducts water and dissolved materials. In the cross section of a tree, the sapwood is recognizable by its texture and color; it is softer and lighter than the inner heartwood.
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. Before the synthesis of aniline dyes, the heartwood of several tropical trees (sold collectively under the commercial name brazilwood) was used to produce blue, purple, and red dyes. As a tree becomes older, the heartwood increases in diameter, whereas the sapwood remains about the same thickness. See woodwood,
botanically, the xylem tissue that forms the bulk of the stem of a woody plant. Xylem conducts sap upward from the roots to the leaves, stores food in the form of complex carbohydrates, and provides support; it is made up of various types of cells specialized for each of
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The center portion of a tree trunk that is no longer growing or carrying the sap; often harder and denser. See also: Douglas fir



the older internal part of the wood of many timber trees. The heartwood is usually darker than the surrounding sapwood (cinnamon-brown in oak, yellow in barberry and acacia, reddish in yew, orange in alder, and almost black in ebony). As a result of the plugging of the vessels and tracheids with tyloses, resins, gums, essential oils, and other substances, the heartwood is almost impermeable to water and air and is resistant to rotting and fungal infestation.


Xylem of an angiosperm.

heartwood, duramen

Wood at the core of an exogenous tree; normally darker and much more durable than sapwood.


the central core of dark hard wood in tree trunks, consisting of nonfunctioning xylem tissue that has become blocked with resins, tannins, and oils
References in periodicals archive ?
The sapwood region has higher signal intensity compared with the heartwood region indicating that the sapwood has higher MC than the heartwood.
In this species, the heartwood shows a distinctive brown colour compared to the lighter coloured sapwood.
The distinction between heartwood and sapwood was performed macroscopically by colour difference, and heartwood radius and sapwood width were measured.
Neil Edwards, head of tax solutions at Heartwood Wealth Management, said: "In our experience many parents are torn between leaving a meaningful inheritance to their children and helping them to cope with rising education costs, debt and unaffordable house prices.
Heartwood has forecast long-term risk and return characteristics for each asset class in which it invests and has used them to create a neutral asset allocation position for each of its strategies.
Known as limba bariole for its figured heartwood, it is also called: afara, frake, akom and a long list of other regional names including korina, especially in the guitar world.
Simon Lough, chief executive of Heartwood, said: "Semi-retirement is becoming the new norm for baby boomers.
Heartwood Wealth Management said chief executives of FTSE 100 companies saw the amount of their personal stake in the equity of their companies drop by an average of more than pounds 2 million each over the first half of 2008.
The Woodland Trust, the UK's leading woodland conservation charity, has named the 345 hectare (850 acre) site Heartwood Forest, and it hopes the new name will give a further boost to its fundraising appeal.
Daniel Manter, a plant physiologist in the ARS Soil Plant Nutrient Research Unit at Fort Collins, Colorado, working with Rick Kelsey, of the USDA Forest Service, and Joe Karchesy, at Oregon State University, have found that extracts from tree heartwood can limit the growth and sporulation of the agent that causes SOD.