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Cannaversity .: Glossary

Glossary


Terms in glossary: 321.

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Rejuvenation
growth on a mature, flowered plant such that the new growth is juvenile, prefloral limbs.
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Retting
The breakdown of tissues and epidermal layer that join fibers into bundles so that the individual fibers are freed.
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Rock Wool
Mineral or rock wool has been used extensively in Europe and North America. Like perlite and vermiculite, it originates from a natural mineral (aluminum silicates with some calcium and magnesium) that is heated to form fibers that are used to make blocks or cubes as a finished product. Blocks or slabs of rock wool are used extensively by hydroponic growers of greenhouse vegetables. Rock wool typically has an alkaline pH, is sterile and chemically inert. Be careful when handling rockwool, it can get into your lungs and skin.
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Roguing
Removal of undesirable plants from the population.
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Root
A root is a plant structure that obtains food and water from the soil, stores energy, and provides support for the plant. Most roots grow underground.
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Root Bound
A condition where a plant or seedling's roots have grown compacted and entwined in the pot and has no room to grow. This condition stunts plant's growth and potential.
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Root cap
A structure at the ends (tips) of the roots. It covers and protects the apical meristem (the actively growing region) of the root.
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Rosetting
Very short internodes.
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Ruderalis
Ruderalis is one of three marijuana varieties. Not a very good choice for flower production, indoors or out. Despite maintaining a short stature, growing only one to five feet tall, and maturing rather quickly, Ruderalis just doesn't produce the yield or quality one looks for in their flowers. A slight light cycle reduction can trigger a sprout with as little as 2 to 3 leaf sets to flower. Ruderalis spontaneously initiates flowering a few weeks after sprouting, and will not produce decent flowers unless the photoperiod provides around 18 to 19 hours of light. Even then, the yield and quality are far less than with Sativa or Indica.
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Sativa
Sativa is a hard plant to grow indoors due to high lighting requirements, tall stature, and late flowering traits. Sativas come from equatorial regions, thus the necessity for high amounts of lighting and a warmer tropic-subtropical climate. Sativas have long, slender leaves. A Sativa will typically produce a euphoric, energetic, cerebral high. Despite the Sativa's climatic limitations, they are truly a reward to obtain, grow, and smoke. A pure Sativa will take 2 to 4 months to finish flowering.
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Scion
stem shoot tip used in a graft.
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ScrOG/ SOG
"Screen Of Green" method. The purpose of ScrOG is to maximize your usage of the available space and lighting by training the new growth of a plant into a screen or mesh.
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Selection
Choosing of favorable offspring as parents for future generations.
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Senescence
The decline towards death of an organism.
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Sensimilla
Spanish for "without seed." Occurs when a female plant is grown to harvest without exposing the plant to male pollen. This increases THC percentages and overall yield.
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Sessile
Attached flush with the surface.
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Sex Limited
a trait expressed by only one sex.
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Sex Linkage
Genes occurring on the sex chromosomes.
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Sexual Propagation
reproduction by recombination of genetic material from two parents through the union of two gametes.
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Sinsemilla
The phrase sin semilla is Spanish, originating from Mexico, and means literally "without seed"; the English word sinsemilla means mature seedless pistillate marijuana grown by removing male plants to prevent pollination.
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Soil Atmosphere
gaseous portion of the soil.
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Soil Solution
Liquid portion of the soil.
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Somatic
pertaining to the physical body.
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Sporogenous Tissue
tissue related to the development of spores (pollen).
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Stamen
This is the male reproductive organ of a plant, located in the androecium of the flower. It has two components: the filament and the anther.
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