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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 ?
Heartwood was founded in 2003 by myself and Neil Wadhawan.
We are enhancing our proposition to deliver higher sustainable levels of income in response to clients growing demand, which is based on changing retirement patterns and new pension freedoms, said Heartwood IM head Noland Carter.
The purpose of this study was to assess the potential for using thermal modification, alone or in combination with boron or glycerol pretreatment, to enhance the resistance of Douglas-fir heartwood to attack by mold and decay fungi.
Heartwood Wealth Management has named Jeremy Croysdill as client director.
amp;bull; The CF Heartwood Cautious Multi Asset Fund aims to deliver a total return (the combination of income and growth of capital) through investments in a diversified range of asset types.
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.
And Heartwood added estimates that since the end of June CEOs have lost a further pounds 2,230,000 each on average since last summer.
Although the Trust bought the land on which to create Heartwood Forest at the beginning of October, it still needs donations to plant 600,000 trees and manage the site for the next five years, so is continuing with its f8.
Manter and his colleagues tested the effectiveness of heartwood from a variety of trees in destroying fungal spores--the main means of dispersal for P.
Thursday's directive by Singleton "is pretty solid proof that the Forest Service was playing games with thousands of people's livelihoods to try to get a political advantage,'' said Jim Bensman of Heartwood, a Midwest forest protection group that had sued the Bush administration over changes the administration made to forest management rules.