Plant Science Terms - X-Y-Z
Xeric - plant or landscape that conserves water. Most xeric plants need minimal supplemental water after an establishment period (18 to 24 months after planting) unless there is extreme drought
Xeriscape - a landscape style that employs drought-resistant plants to help conserve water
Xylem - principal water conducting tissue of vascular plants
Yellows - type of disease, common among some flowers, that is caused by a virus or mycoplasma-tike organism. This disease causes stunting and a yellowish appearance
Yield - refers to both the measure of the yield of a crop per unit area of land cultivation, and the seed generation of the plant itself
Zone of elongation - area of the root where the cells expand