Turfgrass Management Terms U - V - W

Underground drainage – system installed beneath a natural or synthetic turf system to permit the uniform and speedy exit of moisture from the playing surface. It may consist of natural materials, (sand/soil), and/or engineered products (pipes, drainage mats or synthetic stone substitutes)

Variety - classification, a subdivision of species. Differing from the remainder of the species in one or more recognizable and heritable characteristics

Vegetative propagation - propagation by means of pieces of vegetation, i.e., sprigs or sod pieces

Verdure - green, living plant material remaining after mowing

Vernation - how young leaves are arranged in grass shoots. The blade can be folded or rolled and is evident by cutting across the sheath and looking inside. Folded vernation will look v-shaped, while rolled vernation will look circular 

Vertical mowing (verticutting) - thinning of turfgrasses by blades or wire tines that cut perpendicular to the soil surface. Specifically designed to remove mat, thatch and grain from greens and to thin dense turf

Villous- densely hairy with long, soft hairs

Warm season - growth begins in late spring, continues through summer, and stops in early fall

Warm-season grass - grasses that experience their peak growth period during warm summer months. Warm-season grasses grow at their optimal rate between 75 F and 95 F. Most of the common warm-season lawn grasses in the United States are tropical natives that can’t survive northern winters. However, many cold-hardy native North American prairie grasses are warm-season grasses, too. Warm-season lawn grasses including St. Augustine, Bermudagrass, Carpetgrass, Centipede, and Zoysia typically go dormant and turn brown during winter months 

Weed Eater - brand name of the first string trimmer. It was invented by Houston dance studio owner George Ballas and introduced in 1971. He wanted to clear brush on his 2-acre homestead. While at a car wash, the swirling brushes gave him an idea. He punched holes in a can, put a wire through it and added a motor to spin the unit and the Weed Eater was born. The invention revolutionized professional lawn care

Weeds - plants out of place; undesirable or unwanted plants

Wettable powder - dry powdered formulation of a pesticide that is applied as a suspension in water

Wetting agent - chemical additive that improves the spreading, dispersing, and/or wetting properties of water

Wilt - loss of freshness and turgidity. Drooping of leaves due to inadequate water supply or excessive transpiration. Also a vascular disease that interferes with utilization of water by a plant

Winterkill (winter kill) - turf injuries from a variety of causes occurring during the winter and become evident in spring. Grown in the proper climate zones, most lawn grasses snap back after winter, but severe or extended cold weather and lack of insulating snow cover can partly or completely kill off a lawn. Common causes of winterkill include cold desiccation, in which uncovered grasses continue to lose moisture in the cold, and snow mold, which is the collective name for a variety of fungal diseases that cause crusty or fuzzy patches on a lawn


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