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Gibberellins A category of hormones that stimulate growth through cell division or elongation or both. (Nelson, 2003)

Glasshouse A term used more commonly in Europe to designate a structure used for growing plants that has a transparent cover and an artificial heat source. The equivalent American term is greenhouse. (Nelson, 2003)

Gravelculture A system for growing plants in a root substrate consisting exclusively of gravel. (Nelson, 2003)

Gravitational force In reference to soil water it is the force of the earth’s gravitational pull on water in the soil that causes water to move downward in the soil profile. (Nelson, 2003)

Green plants Commercial crop plants grown in a pot and sold primarily for the aesthetic value of their foliage. (Nelson, 2003)

Greenhouse A structure used for growing plants that has a transparent covering and an artificial heat source. (Nelson, 2003)

Greenhouse range A term referring collectively to two or more greenhouses at a single location that belong to the same business entity. (Nelson, 2003)