Medical Marijuana Glossary


Medical Marijuana Glossary

Browse the glossary using this index

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D

Drainage

to empty soil of excess water - Good drainage: water passes through soil, evenly promoting plant growth and Bad drainage: water stands in soil, actually drowning roots

Drip (Irrigation) System

efficient watering system that employs a main hose with small water emitters (tiny holes) which meter out water one drip a time at regular, frequent intervals

Drip Line

a line around a plant directly under its outermost branch tips: Roots seldom grow beyond the drip line

Dry Ice

cold, white solid substance formed when CO2 is compressed and cooled: Dry ice changes into CO2 gas at room temperatures

Dry Soil Pocket

small portion of soil that remains dry after watering: Dry soil pockets may be remedied by adding a wetting agent (soap) to water and/or waiting 15 minutes between watering

Dry Well

drain hole filled with rocks, to receive drainage water

E

Electrode

a solid electric conductor used to establish electrical arc between contacts at either end of an HID lamp

Elongate

to grow in length: Cannabis stretches from three inches to a foot when flowering is induced

Embolism

bubble of air in the transpiration stream of a cutting; blocks uptake of water and nutrients

Embryo

a young plant, developing within the seed: In cannabis, an embryo is derived from a fertilized ovule

Emit

to give off, send out (as light or sound, etc.)

Encarsia Formosa

a parasitic wasp that preys on whiteflies

Envelope

outer protective bulb or jacket of a lamp

Epsom Salts

hydrated magnesium sulfate in the form of white crystalline salt: Epsom salts add magnesium to soil

Equinox

when sun crosses the equator and day and night are each 12 hours long: The equinox happens twice a year

Essential Oils

volatile oils that give plants their characteristic odor or flavor; contained in the secreted resins of plants

Ethane Methyl Sulfonate

a mutagenic chemical that causes changes at the DNA level; induces genetic mutations

Etiolation

growth of a plant in total darkness to increase the chances of root initiation

F

F1

first filial generation, the offspring of two P1 (parent) plants

F2

second filial generation, resulting from a cross between two F1 plants

Fan Leaves

large, fan-like marijuana leaves: Fan leaves are usually low in potency

Female

pistillate, ovule, and seed producing

Fertilize

1. to apply fertilizer (nutrients) to roots and foliage 2. to impregnate (unite) male pollen with female plant ovary

Fertilizer Burn

over fertilization; first, leaf tips brown (turn brown), then leaves curl

Flat

a shallow container used to start seedlings or clones


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