Mainlining is a structured training system that combines low topping, removal of all growth below the topping point, and repeated symmetrical topping so that every main stem is fed from a single central "hub". The result is a plant with 4, 8 or 16 identical colas sitting at the same height.
In practice
Top above the third node, strip everything below, tie the two remaining shoots horizontally, then top each again to make four, then eight. Each branch draws evenly from the hub, so buds tend to be uniform. The cost is time: mainlining typically adds about two to four weeks of veg compared with an untrained plant. It suits photoperiods and SCROG; it is a poor fit for autoflowers.
Evidence is grower practice. Cannabis research does show that plant architecture affects how uniform cannabinoid content is across the canopy, which supports the logic of even colas.
Don't confuse with
- Manifolding: often used as a synonym; some growers reserve it for the hub-and-arms shape specifically.
- Mainline (drugs): unrelated.
The dense, elongated cluster of flowers that forms at the end of a stem or branch; the main cola tops the leader.The daily length of light versus dark; photoperiod cannabis flowers when nights grow long enough, rather than at a fixed age.SCROG (screen of green) trains a few plants under a horizontal net, tucking shoots so the canopy forms a flat, evenly lit layer of many tops.A day-neutral cannabis plant that starts flowering by age, usually a few weeks after germination, regardless of light schedule; the trait is mainly recessive.A cannabinoid is any compound that binds the body's cannabinoid receptors or shares the typical cannabis terpenophenolic structure; the plant-made ones are phytocannabinoids such as THCA and CBDA.Manifolding builds a plant's structure as a central hub with symmetrical horizontal arms, so every top receives equal sap flow and grows to similar size.Topping is cutting off a plant's main growing tip just above a node, so the two shoots below grow into two main colas instead of one.LST (low-stress training) bends and ties stems so the plant grows wide and flat, exposing more bud sites to light without cutting or breaking tissue.An even canopy is one where all main tops sit at roughly the same height, so each receives similar light intensity and buds develop more uniformly.
