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The heartwood of a tree doesn't actually do anything. It is center of a tree. It i s non-functioning, darker wood and sometimes dead. Heartwood supplies the flexibility to allow the tree to sway in the wind.
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This one requires a bit of explanation. A hardwood tree has broad leaves--oaks, maples, birches. A softwood tree has needle leaves--pines and firs. Since no tree has both kinds of leaves, no tree can produce both hardwood and softwood. Now...every tree contains heartwood and sapwood. The sapwood is to the outside and carries the sap from the roots to the leaves. Heartwood is inside the sapwood, and it's more dense because it gives the tree its strength. So, heartwood is harder than sapwood, but it's relative; maple sapwood is very hard compared to poplar heartwood.
The heartwood is ,as the name suggests, the oldest wood in the tree, it no longer transports sap or nutrients but is vital in the stability of the tree as it keeps it upright and pliable.
Heartwood
One can buy heartwood from a wood shop or woodcutter's yard. Heartwood is the dense inner part of a tree trunk and it is this section that is mostly used for the hardest timber.
It is Heartwood. (The Older xylem cells of heartwood no longer carry water).
The heartwood.
The heartwood.
Heartwood is the most inner part of a tree. It is the most inner part because it keeps the tree alive. It is surrounded by 4 more layers of the trunk- the outer bark, inner bark, cambium, and sapwood.
Heartwood
Springwood is the heart of the tree trunk. Heartwood is the tissue or dead tissue. Summerwood is the out layer of the tree trunk.