Back to Glossary A - Z

Eave A component of the greenhouse frame to which the side wall and roof are connected. (Nelson, 2003)

Ebb-and-flow system A cultural system in which containerized plants are grown in a watertight bench top. When watering is required, nutrient solution is pumped into the bench to a depth of 0.5-0.75 inch (13-19 cm). The solution is drawn into the root medium by capillarity. When the pot is thoroughly wet, after about 10-15 minutes, the nutrient solution is drained from the bench to a holding tank where it is stored until needed by the crop again. This is a closed cultural system. (Nelson, 2003)

Eco-label Within the floral industry this is the label that can be imprinted on plants and fresh flower packaging and/or sales related to corrspondence including packing slips, invoices, and advertisements that indicates complieance with worker social justice and/or environmental protection standards of one of four or more independent labeling organizations. (Nelson, 2003).

Employee One who works for wages or salary in the service of an employer. (Nelson, 2003)

Employer One who employs another individual. (Nelson, 2003)

Emulsifyable concentrate (EC) A liquid pesticide preparation containing the pesticide dissolved in oil and an emulsifying agent to render the oil miscible in water. (Nelson, 2003)

Emulsifying agent A chemical that when added to two immiscible liquids render them miscible. (Nelson, 2003)

Epinasty The state in which the more vigorous growth of the upper surface of an organ (as in an unfolding leaf) causes a downward curvature. (Nelson, 2003)

Equinox The two times of the year when day and night are of equal length everywhere on the earth, The sun is closest to the equator. The vernal equinox occurs about March 21; the autumnal equinox , about September 23. (Nelson, 2003)

Even-span greenhouse A greenhouse both of whose roof slopes are of equal length and angle. (Nelson, 2003)

Excelsior pad A pad comprised of curled shreds of weed, generally aspen wood, that is used for evaporative cooling of greenhouses. (Nelson, 2003)