wildflower The flower of a plant seeding itself by natural means in an uncultivated ground, or any flower not cultivated, or a flower from a native or wild condition planted in a cultivated garden.

wildlife Generally, animals that are not domesticated and are not aquatic.

wilt With regard to plants, this means to become limp because of lack of water.

wilting The state of a plant losing its leaf turgor, usually becoming a dull color, limp, and drooping because of lack of water supply.

wilting coefficient See wilting point.

wilting point The percentage of water in soil when permanent wilting of plants occurs. This is when the soil can no longer supply water at a rate sufficient to maintain the turgor of a plant, and it then permanently wilts. This is the point of moisture condition in the soil when the drainage and usage of water has reached a point that the remaining water cannot be drawn or moved to roots. The matric force acting on the water prevents molecule movement. See also micropores.

windbreak A dense growth of vegetation (usually trees) affording protection against wind.

windfall Trees blowing over in wind. It may refer to their tendency to do so because of their root structure, root confinement, root removal, or location.

wind load The force exerted by wind on a structure or part of a structure.

wind shake A crack or fissure in a log caused by wind strain during growth.

windthrow A condition in which plants (especially trees) are thrown to the ground by wind without breaking their main stem, but instead having their roots torn or lifted out of the ground.

window boxes Containers for growing plants, usually herbaceous, immediately below windows and usually attached to the building.

window head In framing, the upper horizontal member of the window frame.

window well A recess located below-grade to admit natural light to enter a below-grade window. They are often formed by a U-shaped corrugated metal sheet, but are also constructed of concrete, timbers, boulders, stone, etc.

windshield survey A rapid, extremely general sampling method for vegetation or land use wherein information is simply gathered by observations from a moving vehicle.

wing In botanical terms, any membranous expansion such as on a seed, or leafstalk, or along a stem or branch.

wing nut A nut having projections so that it can be tightened with fingers.

winter The coldest season of the year occurring between fall and spring. See also winter solstice.

winter annual An annual plant that germinates in the fall, spends the winter as a seedling, and then flowers in the spring or summer.

winter bud A fleshy bud that detaches from an aquatic plant and winters over at the bottom of the water and grows into a new plant the next spring.

winterization See winterize.

winterize To prepare an irrigation system for winter by removing water from the system. Commonly used in temperate climates where freezing temperatures in winter will burst pipes, fittings, or any device filled with water. This is commonly accomplished by forcing air through the system with a compressor, by allowing automatic drains at low points on pipes to drain, or by opening manual drains by hand.

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