This type of cultivation, called scrog, is based on the horizontal grow and it permits to optimize variable factors, as vertical space and light.
The theory is very simple: a horizontal net (at about 10 cm from the medium) is settled, and the plant will be forced to pass through the holes of the net. This technique is particularly indicated for small spaces, where the height of the plant can be managed in a horizontal way. Moreover, scrog is useful to take the best from lamps: often the biggest leaves will overshadow the rest of the plant. The horizontal grow solve this problem putting leaves at the same distance from lights.
The practical realization of a scrog, instead, is more complicated: you can use a net for each plant, creating a modular scrog, or a larger net with more plants under it. You can use a garden net, one of those with wide meshes, typically green.
Problems are about: the installation of the net, the disposition of the plant, the sex of plants. With a modular scrog we must install a net for each single vase. The problem is that the net cannot be fixed to the vase if we want to transplant it during its life.
With a normal scrog, the transplanting is very difficult because of the forced proximity of all the plants and because of the impossibility to separate them from the net. You have to calculate the disposition of your plants before positioning them, in order to be able to guide all the branches and to fill up the net uniformely, avoiding an excessive vertical grow.
In normal scrog, moreover, all the plants under the net must be of the same sex so it's advisable to use pipings.
It's advisable to know the characteristics of the growth of plants bofore beginning a scrog; unexpeted increases could cancel the optimization obtained with this method.
The only disadvantage is the amount of work needed to construct and to upkeep the scrog.

Scrog Technique
How to guide branches under a scrog net


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