sorry for double post.
you can also graft slower cannabis clones to the root system of a faster more vigorous cannabis plant, and the slower one will grow more similarly to the rate of the decapitated plant, because the growth auxins are produced in the root system, and pumped to the furthest away portions of the plant first. They arent actually manufactured in the visible portion of the plant above ground lol.
You can graft a younger plant, to a larger older vegging root system, and increase its growth rate dramatically as well.
I use this trick all the time with pereskiopsis (very fast growing succulent) plants to more quickly propagate slower growing cacti that take forever to propagate on their own root systems. And it does work with cannabis plants too it's just not really worth the risk of failure with cannabis. Failure means you've lost two perfectly good plants in that context. With succulents you can take a few mulligans, and they are also perennials. If a graft doesn't take with cannabis, the scion will die and the root system wont be far behind if it doesnt have any leaf surface area of its own.
Cannabis, as a species of plant, especially when mature, can take an absolute ass-kicking in stride for the most part though. Not many species can make the claim they grow wild and unaided, from cold Siberian steppes, to high desert mountains of mexico, to rainforest jungle in columbia and thailand, and even in afghani mountains that only see a foot of rain a year. Im pretty sure cannabis is really the only plant that can make such a claim that exists on the planet.
I dont know of any other non-succulent species that can stand proud in full turgidity 10 hours into direct full-sun exposure at 90f at over 2000ppfd of non cycling light exposure while standing in well-drained, arid soil to boot. And it can take twice the stem damage without wilting off the growth of any other plant i know of while in those conditions. Most plants dont even have the ability to cycle moisture quickly enough from an arid soil to even pull anything like that off. And even when its 95F, a thriving cannabis plant can transpire quickly enough to keep its leaves within the 86f limit of photosynthesis, and maintain growth when even your tomato plants have stalled out.
It can thrive in conditions that would literally sun-burn my trichocereus columnar cacti and stunt them all together.
Cannabis is a bad-ass in the plant world, straight up. The simple fact that it reproduces sexually with discrete sexes, allows it to adapt naturally and very quickly to just about any growable conditions that exist for a plant to be in. Some cacti and succulents have also managed to encourage rapid evolution in a similar way, by evolving self-sterility, forcing genetic diversity and adaptability to the front page.
Sorry, sativa guy, toasted cannabis rant on a day off. Even without considering the side effects of consuming cannabis (certain cacti too lol)... It's a very, very cool plant.