Habitat – The local environment in which a plant or animal lives.
Haul road – A roadway that provides access for trucks to specific points in the woodland for hauling logs or other materials.
Hardboard – A panel of wood formed from wood fibers compressed together under heat.
Harden off – A natural physiological change that a plant goes through late in the growing season to prepare it for winter survival. It involves thickening of cell walls and other physiological changes.
Hardwood – A broadleaf, usually deciduous, tree such as oak, maple, ash, and elm.
Harvest – The felling and removal of final crop trees on an area to 1) obtain income, 2) develop the environment necessary to regenerate the forest, or 3) achieve objectives such as development of wildlife habitat. Contrast with intermediate cut.
Height, merchantable – The length of a tree stem from the top of the expected stump to the maximum height above which no usable wood products may be obtained. For example, if the minimum usable diameter of pulpwood sticks is 4 inches, the merchantable height of a straight tree would be its height from stump height up to a trunk diameter of 4 inches.
Height, total – Height of a tree from ground level to the top of its crown.
Herb – A nonwoody plant.
Herbicide – A chemical that kills herbaceous (nonwoody) plants. In common usage, often used interchangeably with phytocide (plant killer) and silvicide (tree killer).
Humus – any organic matter which has reached a point of stability, where it will break down no further and might, if conditions do not change, remain essentially as it is for centuries.