Tear open a pack of feminized seeds and you are holding the result of a small biological trick that needed breeders the better part of the 1990s to get right. Each one of those seeds has two parents, and both of them were female. Not a single male plant touched the cross. Knowing how that is done, and why it holds up genetically, explains almost everything buyers want to know about feminized stock: why the advertised rate is quoted as a percentage rather than a promise, where hermaphrodites actually come from, and what separates a properly bred line from a rushed one. Specialists such as https://queenfeminizedseeds.com state a female rate of 99 percent on their lines, and the rest of this article sets out what sits behind a number like that.
Cannabis is dioecious: individual plants are male or female, and just the females grow the resinous flowers growers want. From a regular seed, roughly half the plants are male, which leaves two problems. Fifty percent of the space, light and weeks go to plants that will be discarded, and a single male missed for a few days after flower can pollinate an entire room, turning a flower crop into a seed crop.
Identifying plants early is possible but never certain, and in a home grow the waste is proportionally larger. This is the demand that produced feminized breeding: never a desire for stronger genetics, just a way to ensure that every seed sown becomes a plant worth keeping.
A female cannabis plant has two X chromosomes. Left to itself it will only make female flowers, yet under certain conditions it can be pushed to grow male flowers too, and the pollen in those flowers carries only X chromosomes, since the plant has nothing else to give.
Breeders trigger that reversal on purpose. The standard method uses a silver solution, usually silver thiosulfate, to a chosen female just before flowering. The silver blocks the plant’s ethylene response, and ethylene is the hormone that instructs a cannabis plant to develop female flowers. Deprived of that signal, the sprayed branches produce male flowers instead. An older method, rodelization, just allows an unpollinated female flower far past ripeness until it produces a few late male flowers unaided; it works but yields little pollen and selects plants prone to do exactly that, which is not a habit worth passing on.
The reversed plant is only a pollen source. Its treated flowers are not used and the plant as a whole is retired after the pollen is harvested.
Normally a male plant contributes either an X or a Y chromosome with each seed, and the Y makes a male offspring. Pollen from a reversed female contains X and nothing else. Combine it with the egg of another female, which is again X, and each resulting seed is XX: female.
This is the whole basis, and it explains two things buyers see. First, a feminized line is not weaker in itself: no part of the method alters the genes beyond removing the Y. Second, the phrase «selfing» means pollinating a reversed plant with itself, and this concentrates the genetics dramatically; a lot of bargain feminized lines are selfed seeds from a one clone, and they show both the virtues and the hidden weaknesses of that one plant.
The most persistent complaint to feminized seeds is that they throw hermaphrodites: plants that develop a few male flowers within the female ones and pollinate themselves. The worry is understandable but usually aimed at the wrong thing.
The capacity to throw male flowers under stress is present in most cannabis genetics, regular or feminized. What counts is how easily a given line does it. A serious breeder tests the chosen parents against that tendency before treating anything: plants that show male flowers under mild stress, light-leak problems or extended flowering are dropped, and only the stable plants are used as parents. A rushed breeder skips that step, reverses any plant is to hand, and sells seeds that inherit the parent’s weakness.
In other words, hermaphrodites come from bad parent selection and from grower stress, not from the feminization process as such. The silver treatment does not carry anything to the seed; the screening before it is what does.
Not one reputable seller advertises a one hundred percent female rate, and a figure like 99 percent is a statement of where the last fraction arises. In a very small proportion of seeds the treatment leaves a grain with an unusual chromosome complement, or a seedling has the hermaphrodite tendency at a degree the screening missed. Over large numbers of seeds those events work out to about one in a hundred.
To a buyer that translates to one thing concrete. In a pack of 5 seeds at a 99 percent rate, the chance that every plant is female is high but not certain, and the sensible habit is nonetheless to look at the preflowers around the third week of flower. It costs a minute, and it turns up the rare outlier long before it can do any harm.
None of the above is apparent in the seed, so a buyer reads it from the description and from the breeder’s track record. Four signs are reliable.
Buying feminized stock closes two doors, and each of them are relevant to a small number of growers.
The first is breeding in the ordinary way. With no males there is no natural pollen, so producing your own seeds means treating a plant on your own, which needs a silver solution, a separate space and some care. It is feasible at home but far simpler than allowing a male handle it. The second is selection from a broad population. Regular seeds from a well-made line throw more diversity, which to a grower looking for a one exceptional mother that variation is the entire point. Feminized lines narrow the spread, above all when they are selfed. For anyone else, neither one of these loss is noticed.
The great majority of autoflowering seeds sold today are also feminized, and the pairing makes sense: an autoflower cannot make up the weeks lost on a male, so removing males counts still more for autos than with a photoperiod grow. The feminization method is the same; just the parents that are reversed change. Queen Feminized Seeds sells both photoperiod and autoflowering feminized lines, labelled separately so the two are not mixed up at checkout.
Queen Feminized Seeds sends each order in plain packaging, with the original packs unopened inside and nothing on the outside to indicate the contents. Orders to the United States are not accepted, because seed importation is not permitted there. The legal of cannabis seeds differs widely between countries: in a good number of places owning seeds is legal as souvenirs while germinating them is not, and in others both are allowed under local rules or both is. Knowing the position in your own jurisdiction is the buyer’s job, and nothing here is to be read as legal advice.
CARBURANTES MONTILLA S.L. ha recibido una ayuda de la Unión Europea con cargo al Programa Operativo FEDER de Andalucía 2014-2020, financiada como parte de la respuesta de la Unión a la pandemia de COVID-19 (REACT-UE), para compensar el sobrecoste energético de gas natural y/o electricidad a pymes y autónomos especialmente afectados por el incremento de los precios del gas natural y la electricidad provocados por el impacto de la guerra de agresión de Rusia contra Ucrania.
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