SCRoG = Screen Of Green -
A term used to describe a method of growing
cannabis indoors, usually in cabinets, closets or other restricted areas. The essential detail of the scrog method is a screen, usually poultry netting, typically suspended between the planting medium and the light source, usually one or more high-pressure sodium (HPS) bulbs, in the 70-400 watt range. The plants grow up to the screen and then are "trained" or tied to the screen, resulting in a flat table of plant growth. Because all the flowering buds are growing at the same height, it is possible to get all the growth within the effective circle of light from the lamp. Cannabis does not flower effectively unless the flowers or "buds" are exposed to a relatively intense light field, and the scrog method allows more buds to be closer to the relatively small HPS lamps used in cabinet cultivation.
The method was first popularized by the work of an internet poster known as "pH" on the usenet group "Alt Drugs Pot Cultivation". The method as initially used by pH was designed to allow growing under fluorescent lights, which are much less intense than HPS lamps, using multiple shallow shelves. N.P. Kaye, at the Lycaeum site, is credited with the term "screen of green", which pH shortened to "ScrOG".
Variations of the method include "bog" for "box of green", first coined by an internet poster known as "Kunta". Added to the horizontal screen are vertical screens around the perimeter. Either additional plants are used at the edges, or the scrog field plants are grown longer, but either way, the additional foliage is allowed to grow up the outside of the vertical screen, taking advantage of wasted air space above the field. It also allows plants at the edge of the field to get into the circle of intensity from the bulb. Another popular variation is to use a vertical screen form, known as "v-scrog", often using a cylinder arrangement.
Although the development of this method occurred while cannabis cultivation was almost universally outlawed, cannabis cultivation is now legal or tolerated in a growing number of countries, as well as in certain parts of the United States for medical purposes. Some state laws restrict cultivation to a small number of plants. The scrog method can maximize production without exceeding legal limits, as one plant can be trained over an extensive area of screen.
