Temos que pesquisar um pouco antes de pregar "verdades absolutas". Deixo de participar de varios tópicos por discuções bobas q fazem o topico perder o foco. Polui mto menos um topico só com informação para futuras buscas do que um topico cheio de picuinhas e zoações, com duvidas do nivel que todos que tem uma boa experiência hoje em dia já tiveram. Duvidas bobas ou não, se não tiver algum topico sobre, seria legal ter um topico limpo para não se repetir
Numa rapida busca encontrei alguns posts no rollitup e alguns outros forums internacionais sobre o assunto. E sim, a "coincidência" existe por lá. Sobre a questao de "os gringos já saberiam", alguem já pensou que temperatura, incidencia de luz solar, humidade e etc são fatores que mudam de pais para pais? Talvez os gringos não usassem isso pois com o clima deles as plantas não exalassem, porem acho que não é o caso, visto os relatos nos forums gringos.
Com certeza não devemos utilizar isso como padrão decisivo na hora do descarte, mas vamos supor que na hora de selecionar 50 seeds não seria legal tirar as 10 que jugaríamos ser plantas do sexo masculino? Sei que não temos base para essa tecnica e fatores geneticos poderiam nos fazer enganar. Mas quanto a experienciar não vejo mal nenhum, e se isso vier a ser comprovado, mesmo que não em 100%, seriamos grato ao criador do topico, um ilustre "iniciante".
Segue abaixo o texto que achei em um post do roll it up. Quem não le ingles bota no google tradutor que o texto é bem facil.
Sexing the Plants
The female plant is more desirable than the male for marijuana cultivation. The female flowering clusters (bus) are usually the most potent parts of the harvest. Also, given room to develop, a female generally will yield twice as much marijuana as her male counterpart. More of her weight consists of top-quality buds.
Because the female yields marijuana in greater quantity and sooner you can devote your attention to nurturing the females. Where space is limited, such as in indoor gardens and small outdoor plots most growers prefer to remove the males as soon as possible, and leave all available space for the females. To harvest sinsemilla (seedless female buds), you must remove the male plants before they mature and release pollen.
Differences in the appearance of male and female Cannabis become more apparent toward maturation. During the seedling stage, gender is virtually impossible to distinguish, although in some varieties the male seedling may appear slightly taller and may develop more quickly.
We know of no way to discover gender with any certainty until each plant actually forms either pollen-bearing male flowers or seed-bearing female flowers. However, certain general characteristics may help. Using guidelines like the following, growers who are familiar with a particular variety can often predict gender fairly accurately by the middle stage of the plant's life.
Early Vegetative Growth
After the initial seedling stage, female plants generally develop more complex branching than the male. The male is usually slightly taller and less branched. (Under artificial light, the differences in height and branching are less apparent throughout growth.)
Some plants develop a marked swelling at the nodes, which is more common and pronounced on female plants.
Middle Vegetative Growth
In the second to fourth months of growth, plants commonly form a few isolated flowers long before the actual flowering stage begins. These premature flowers are most often found between the eighth and twelfth nodes on the main stem. Often they appear near each stipule (leaf spur) on several successive nodes, at a distance two to six nodes below the growing tip. These individual flowers may not develop fully and are often hard to distinguish as male or female flowers. The fuzzy white stigmas of the female flower may not appear, and the male flowers seldom opens but remains a tightly closed knob. However, the male flower differs from the female; it is raised on a tiny stalk, and the knob is symmetrical. The female flower appear stalkless and more leaflike.
The presence of premature female flowers does not assure that the plant is a female, but premature male flowers almost always indicate a male plant. Unfortunately, it is much less common for male plants to develop premature male flowers than for female flowers to appear on either plant. For example, in one garden of 25 mixed-variety plants, by age 14 weeks, 15 plants showed well-formed, premature female flowers with raised stigmas. Eight of these plants matured into females and seven became males. Only two plants showed premature male flowers and both of these developed into males. The eight remaining plants did not develop premature flowers or otherwise distinguishable organs until the actual flowering stage at the age of 21 weeks. From these eight, there were four females, three males, and one plant bearing both male and female flowers (hermaphrodite). It does seem, however, that plants bearing well-formed female flowers, on several successive node, usually turn out to be females.
In the week or two prior to flowering and throughout flowering, many common marijuana varieties follow two general growth patterns which depend on gender. With these varieties, you can tell gender by the spacing between the leaves (internodes). For the female, the emphasis is on compact growth. Each new leaf grows closer to the last, until the top of the plant is obscured by tightly knit leaves. The male elongates just prior to showing flowers. New growth is spaced well apart and raises the male to a taller stature. This may by the first time the male shows its classic tall, loosely arranged profile.