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Wettable powder In floriculture, an agricultural chemical formulated generally in talc or dry clay. It is suspended in water by continual mixing and is applied as a spray or root-media drench. (Nelson, 2003)

Wetting agent See surfactant.

Whole-firm recirculation A closed circuit system encompassing an entire firm. Effluent from all benches or beds is channeled to a treatment pond. There, it is often treated for pathogens, analyzed, and nutritionally altered prior to being recirculated through the crops. (Nelson, 2003)

Witch’s broom A symptom of boron deficiency in a plant. A witch’s broom consists of a large number of shortened plant stems situated parallel and close to one another to give the appearance of the straws in a broom. (Nelson, 2003)