The Cannabis Grow Bible. Greg Green

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      Hermaphrodite flowers, containing both male and female parts, are to be avoided. A stressed plant or unwelcome genetics can produce this undesirable result.

      It should be the goal of every cannabis cultivator to grow non-pollinated female plants because these produce the best yield. The goal of a cannabis breeder is to produce quality seeds and plants. How breeders and growers achieve these goals is the subject of this book.

Cannabis Species

      One of the mostly hotly contested topics in cannabis is the question of species. For nearly two hundred years, cannabis has been the subject of several serious and often contentious studies, including court trials, to determine its taxonomy. There was a legal necessity to make a viable (and possibly universal) statement on a complete scientific orientation for the cannabis species, along with a need to identify lawful and illicit substances.¹⁷ For this reason, the categorizing of cannabis is of immediate scientific concern. Today, we are able to answer many of these questions because of advancements in genetic research.

The History of the Scientific Classification of Cannabis

      Older sources, such as the Encyclopaedia Brittanica, defines Cannabaceae as

      of the hemp family of the nettle order (Urticales), containing two genera and three species of aromatic herbs distributed throughout temperate parts of the Northern Hemisphere. Older authorities included the two genera, Cannabis and Humulus, in the mulberry (fig) family (Moraceae).¹⁸

      The order of Rosales has replaced Urticales, but cannabis (hemp) is still in the same family Cannabaceae along with Hops (Humulus) and Celtis (hackberries). This means that cannabis is only in the same order of Rosales (Urticales) as nettles but is of the different family Cannabaceae and is more distinctly called cannabis to distinguish itself from Hops and Celtis (including the genera Gironniera, Parasponia, Pteroceltis, and Trema). Proceeding from this formal classification is the question over cannabis species.

Species

      The term species is hard to define, but it can be referred to as “a fundamental category of taxonomic classification, ranking below a genus or subgenus and consisting of related organisms capable of interbreeding.”¹⁹ However, biologists agree that taxonomy at the species level is not always clear because it is a manmade description with limitations. A species is a classification of a distinct genus into groups that meets the main criteria of a population; the species reproduces itself by breeding within its own population group to produce fertile offspring. Usually, this definition comes with some standards that need to be upheld. If a population group, a species, can breed outside of its group, with another species population, to produce fertile offspring, then this appears to be in violation of the definition. At least one of the two parents seems to have been incorrectly classified as a different species to the other parent. It seems they should be from the same species and classed as such. However, some species can break these standards. Understanding geographical isolation is important because of the role it plays in species classification. Sometimes two separate populations, although considered separate species, can interbreed and produce viable offspring. They are nicknamed a “ring-species” because of these wider reaching breeding capabilities. Some ring-species produce infertile offspring. A common example is a cross between a donkey and horse to produce an infertile mule.

       FLOWERING

      Normally a pistil or two will show at first. With a magnifying aid you might even see these sooner with less growth.

      There should be more than just one pistil. Look around the node areas of the plant. When one shows more will quickly follow.

      This type of flowering development should be plentiful around the plant at all of the node regions. By this time a grower would have flipped to the 12/12 photoperiod.

      It is important to know that all varieties of cannabis can interbreed, and produce fertile offspring.

      The truth is that “species” is just a labelling system. The existence of a species was questioned by Charles Darwin in The Origin of Species (1859). Darwin verified through the mechanism of natural selection that all organisms had gradually evolved from a common ancestor. This effect is much like a tree with branches and every branch being the line from which new organisms are evolving. Because of extinction large segments of this tree vanish from the face of the Earth while other segments remain. Even though a gradual evolution of an organism has taken place, these gradual changes are not always seen living among us (for example, the dinosaurs are extinct); however, had all of the history of biological things been present, we would have great trouble with the term “species” because the diversity would seem much less. In СКАЧАТЬ