Medical Marijuana Glossary

Medical Marijuana Glossary

Browse the glossary using this index

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Ohms Power Law

a law that expresses the strength of an electric current: Volts x Amperes = Watts

Open Pollination

pollination that occurs naturally, as opposed to controlled pollination, no effect of selection from human interference


1. the most favorable condition for growth and reproduction 2. peak production


1. made of, derived from, or related to living organisms: Growers of organic cannabis use fertilizers and insect control methods of animal or vegetable origin - unaltered rock powders are also considered organic


the equalizing movement of fluids through a semi-permeable membrane, such as in a living cell


breeding between individual cannabis plants that are not closely related


the process of breeding using individual outside of the family, population, or group


load to excess: An electrical circuit that uses more than 80 percent of its potential is overloaded - a 20 amp circuit drawing 17 amps is overloaded


egg which contains the female genes and is found within the plant ovary: When fertilized, an ovule will grow into a seed


tasteless, colorless, odorless, element: Plants need oxygen in the soil in order to grow



organism that lives on or in another host organism without benefiting the host: Fungus is a parasite


hydroponic system that moves the nutrient solution through absorption or capillary action


a disease-causing micro-organism, especially bacteria, fungi, and viruses


partially decomposed vegetation (usually moss) with slow decay due to extreme moisture, cold, and acidic conditions


a plant, such as a tree or shrub, which completes its life cycle over several years


amendment of sand or volcanic glass expanded by heat, which aerates the soil or growth medium


a scale from 0 - 14 that measure a growing medium's acid to alkaline balance: a pH of 7 is neutral, lower numbers indicate increasing acidity, and higher numbers increasing alkalinity: Cannabis grows best in a 6.5 to 8 pH range

pH Tester

electronic instrument or chemical used to measure the acid and alkaline balance in soil or water


the outward form, characteristic and appearance of a plant, determined by the interaction of the individual genotype with the environment phloem: the food- and water-conducting tissue of vascular plants

Phosphor Coating

internal fluorescent bulb coating that diffuses light and affects various color outputs

Phosphorus (P)

one of the macronutrients that promote root and flower growth


the relationship between the length of light and dark in a 24-hour period; affects the growth and maturity of cannabis


the building of chemical compounds (carbohydrates that plants need for growth) from light energy, water and CO2


the environmental response movement of a plant part toward or away from a light source


the arrangement of leaves on a stem, and the principles that govern such arrangement

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