winterizing See winterize.

winterkill Plants that die as a result of exposure to cold winter conditions.

winter solstice The shortest day of the year with the least amount of daylight hours. This day marks when winter officially begins. It is on or near December 21 or 22 in the northern hemisphere and about June 22 in the southern hemisphere.

wiper seal With regard to landscape sprinklers, pop-up heads that have a special seal preventing contaminants from being pulled into the head as it is retracted from extension.

wire basket In landscape construction and plant nursery stock, a steel mesh of wire holding in place a root ball of a plant. It usually has burlap or some other decomposable material inside the basket to assist in keeping soil in place around the roots. Wire baskets are usually left in place when transplanted. In planting, the upper portion of burlap or similar material should be folded back along with the wire to about one-third of the top of the root ball.

wire mesh A web of wires arranged at right angles to each other in sheets or rolls; often used as reinforcement in concrete or masonry.

wire nut A connector for small wires consisting of an insulating cap over a threaded metal insert. It is used by inserting wires stripped of insulation and turning until tight. It is best to twist wires together before inserting them into the nut. For waterproof coverings of connections, a variety of grease-filled caps may be used over the wire nut.

wire size The area of an electrical conductor in section perpendicular to its length. In the United States, this is usually referred to by sizes determined by the American Wire Gauge (AWG) or thousand circular mills (MCM).

wireworm A waxy, yellow worm about 1 in long that cuts roots, eats seeds, and bores into large roots, stems, and bulbs. The adult is a beetle.

witches'-broom Abnormal growth of plants with much branching; often caused by viruses of fungi.

withe 1. A one-masonry-unit thick wall. 2. A flexible twig used to tie roof thatching, as on some beach shade structures, etc.

wither To dry up and reduce in size by shriveling.

WOG A designation for plumbing components that are of sufficient quality to be rated for use with water, oil, or gas systems.

wood The xylem portion of a plant.

wood ashes The residue of burned wood. It is sometimes used as a fertilizer. It is highly alkaline and should not be used on alkaline soils or acid-loving plants. It supplies potassium in the forms of potash with a content varying from 5 to 25%. It contains about 30 to 35% lime and 2% phosphoric acid (NPK 0-2-5-25).

woodland A land area covered with woody vegetation (especially trees).

wood preservative Preservatives include tar, creosote, pitch, sodium fluoride, etc.

woods 1. Woodland. 2. A reference to types of wood in lumber, such as pine, oak, etc.

wood screw A screw used for driving into wood or a similar material and used for attaching elements to the material. See also oval-head wood screw, flathead wood screw, roundhead wood screw.

woody Containing wood or wood fibers.

woolly In botanical terms, clothed with long and tangled soft hairs.

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