| Full | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
| Term | Definition |
|---|---|
| water-holding capacity (WHC) | The ability of a soil’s micropores to hold water for plant use. |
| water sprout | A vigorous shoot originating above ground on a plant’s trunk, older wood, or bud union. Usually breaks from a latent bud. Often the result of heavy pruning. |
| water-soaking | Lesions that appear wet and dark and usually are sunken and/or translucent. Often a symptom of bacterial disease. |
| weed-and-feed | A combination fertilizer and herbicide sometimes used on lawns. |
| whorled | Arranged in a ring. |
| wilt | (1) Lack of freshness, turgor, and the drooping of leaves from a lack of water. (2) A vascular disease that interrupts a plant’s normal uptake and distribution of water. |
| wilting point (WP) | The point at which water content within plant cells is low enough that cellular turgor is lost and the plant wilts. |
| witches’ broom | Abnormal brush-like development of many weak shoots. |
| wood | The dense tissue composed of secondary xylem in stems and roots. |
| woody perennial | A plant that goes dormant in the winter and begins growth in the spring from aboveground stems. |