How To Feminize Cannabis Seeds

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Learn how to feminize seeds at home. Use silver thiosulphate to make your very own cannabis hybrids with your favorite strains for the best results. Feminized seeds have been increasingly rising in demand ever since medical cannabis became legal, but how do we make feminized seeds? Cannabis flower is grown from female plants. Seedsman looks at how to create feminized cannabis seeds to ensure your plants almost always turn out to be female

How to Feminize Seeds

The cannabis industry has evolved more in the last 15 years than it has in the last century. Society has also evolved, allowing cannabis and the idea of weed to slowly make its way into pop culture, with more and more strains available as well as accessories for smoking or consuming cannabis. Nowadays, pretty much anyone can grow cannabis in their own house with all of the necessary equipment to make their own strains. Years ago only a select few had access to such equipment. Today we’re going to show you how to feminize seeds. You won’t need many items to do so, and the ones you do need are easy enough to get.

Like most living creatures, cannabis plants need a male and a female specimen to reproduce; the male pollinates the female plant which causes seeds to grow. The resulting seeds have genes from both the mother and father plants, so it has a 50% possibility of being female or male. This is why you need to find a way to get your seeds by using just female plants, completely getting rid of male genes, which only leaves the possibility for female seeds.

How to Feminize Seeds | Tutorial

Many growers know that if you stress out cannabis plants, they can easily become hermaphoridtes (a plant with both male and female sex organs) which end up creating male flowers that create pollen which then “impregnates” the plant and others around it. The issue with stress-caused hermaphrodite plants is that most of the resulting seeds tend to be hermaphrodites too, so it’s not the best method to use and it also stresses your plants out quite a lot.

In order to turn a female plant male without stressing it out, all you need is some Silver Thiosulfate, also known as STS. If you apply STS to female plants it will modify their ethylene levels, which is the hormone in charge of determining the sex of certain plants. This causes female plants to change sex and turn into males without the disadvantage of male genes.

Silver Thiosulfate

Making your own STS only takes about 15 to 20 minutes and you’ll need two ingredients: Sodium Thiosulphate and Silver Nitrate, both of which can easily be found in any pharmacy and on our webstore. Sodium Thiosulfate is a neutral chemical salt that’s used to reduce side-effects in some cancer treatments and can easily be bought without a prescription.

You can acquire silver nitrate on our webstore, although some people prefer to extract it from other products that contain it, such as Argenpal, a product used to get rid of warts – each one of these little contains a very small amount of Silver Nitrate, so it’s probably better just to buy it directly without the need to spend more money or spend forever trying to extract the Silver Nitrate from the product itself. We stock Panreac Silver Nitrate, which may be a bit more expensive but you’re guaranteed the best quality, and it saves quite a lot of time.

How to Feminize Seeds | Making STS

Caution:

You’ll need protective material such as gloves, safety glasses and a face mask; STS can be quite toxic when inhaled and it can leave large burns on the skin. Make sure you don’t use any metallic objects when making STS – everything should be plastic, as metal can alter the composition and reduce efficiency.

Process:

Do not use metal instruments or tools in this process. The first thing you’ll need to do is grab a plastic cup and pour in 20ml of distilled water. Next, depending on your chosen method, get either 7 Argenpal sticks or 0.35g silver nitrate. If working with Argenplal, dilute the tips delicately in the water (the tip is where the silver nitrate is). Grab another plastic cup and add 30ml distilled water and 1.3g of sodium thiosulfate, mixing it slowly until it’s fully dissolved. Then, mix the contents of both glasses and mix slowly again – make sure to use a plastic spoon, no metal.

The result is 50ml of pure Silver Thiosulfate, much too potent to use on your plants, so you’ll need to water it down a bit. Add your Silver Thiosulfate to 400ml of distilled water, so you’ll have around 450ml of STS. Make sure to shake quite a lot until it’s completely mixed. It’s still much too concentrated to apply straight onto your plants; take 100ml of the mixture you just made and add it to 400ml mor of distilled water. You now have 500ml of a usable STS mixture that’s ready to be used on your plants.

Recommendation:

For maximum efficiency you’ll need to use it the same day you make it. If stored in a dark, cool space it can last up to 15 days but each day it’ll be a bit less potent. If you have it for over a week and haven’t used it we recommend making another batch if you want the best possible results.

How to Feminize Seeds | How to use STS

STS is used by spraying it on your plants leaves, making sure that it’s entirely covered and dripping. We recommend taking the plant away from your growing area before beginning the process, or the mixture might end up getting on your other plants too. You’ll need to begin applying it 4 or 5 days after flipping the lights, right before your lights go off. This allows you to spray the plant without worrying about the light burning your plants. After 10 days, you need to respray your plants, using the same process, covering the plant in the mixture and letting it soak in in the dark.

The sprayed plant will begin growing male flowers with pollen with can then be used to pollinate whichever plant you want, causing seeds to appear that have absolutely no male genes in them. You can use the pollinated plant in order to make extracts from its resin; the amount of seeds it’ll produce will render it pretty much useless in as far as smokeable flowers. The plant that you’ve applied the STS to will need to be thrown away, as it’s much too toxic to do anything with and if you consume any of it, even its resin, you could run in to some health issues.

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When should you polinate your plants?

In order to efficiently pollinate select plants, we recommend having two completely separate grow rooms or areas to work in. One should be for the plants that you’re planning on switching to male in order to obtain female polen; the other should be specifically for the plants that you plan on pollinating once you’ve reverted the other ones.

When using the pollen that you’ve collected from your reverted plants, you need to make sure that the plant that you plan on using it on is fully ready for it; this can depend on the strain you’re growing. The right time to begin applying feminized pollen is actually right when your plants begin to flow real flowers.

You generally want to use the pollen as fresh as possible on a plant that is fully ready to take it on, or else it simply might not work – it’s kind of like people, in that sense. Certain things need to be just right. To harvest large amounts of high quality seeds, you’re probably better off doing a few tests in order to find out when the right moment is. You can do this by testing it out on the same strain before going big.

How to Feminize Seeds | Make your own strains

When making your own seeds you can combine your favorite strains, resulting in a plant that you’ve created yourself that is 100% feminized. When you combine two strains, you’ll get various phenotypes with varying qualities and structures. It’s important that you use regular seeds to do this, as feminized ones are much too weak and might have issues such as stress and end up becoming hermaphrodites.

In order to stabilize the genes in your resulting plants, you’ll need to select the phenotypes you like the most, meaning that you’ll need to grow quite a lot of the seeds that you get from your feminized plant. Then, take a clone from each plant and set them to flower in order to study their characteristics. Once you’re done, you’ll need to pick two mother plants, revert them and cross them with each other to get a more balanced version. This process is repeated as many times as necessary in order to create a balanced strain that has the characteristics you’re looking for.

Feminizing cannabis seeds is quite the process. You need to be able to keep perfect track and control of the timing when it comes to flowering and pollen yield if you want the best possible results. Take your time, do a few controlled tests and then you can start making large amounts of your own seeds.

3 Best Ways to Feminize Cannabis Seeds

Most people are already aware that cannabis buds we use today come only from female plants.

Male plants pollinate female plants, which produce seeds upon pollination.

Just like children, some seeds end up being female and some male. That’s just how nature works.

A male plant can pollinate a whole room of female plants. Even if there were 50 plants in that area, all the male plant requires is a bit of wind, and each female plant will end up being fertilized.

Getting only feminized cannabis seeds is not an impossible task, you just have to work around the rules set up by nature.

Why are seeds feminized?

Cannabis growers need seeds that are guaranteed to grow into female plants, in order to avoid pollination of the entire crop.

No one wants seeds in their weed and because of this issue we require feminized seeds.

When you’re certain that all your seeds are feminized, you can grow big crops knowing that your plants are safe from pollination by a male plant.

Breeders and seed producers also want feminized seeds for business purposes, as they’re in very high demand in places where growing weed is legal.

As cannabis becomes legal in more places throughout the world, feminized seeds are the first small-time thing new growers will start looking for.

Reliably producing female plants is of great value in this industry, because only female plants produce flowers with medicinal value.

How to feminize seeds?

When breeding cannabis, growers will intentionally pollinate their females in order to get certain traits in the offspring.

How to Start Your Own Marijuana Seeds Breeding Program?

However, sometimes the breeder isn’t looking to cross two strains in hopes of getting a specific trait.

Once the breeder stabilizes a certain trait, he’ll look to mass produce the offspring with precisely those traits. He may do so by feminizing seeds that the “mother plant” produces.

In the wild and without any human tampering, cannabis plants produce mostly female seeds when they “perceive” that they’re approaching the end of their lifetime.

Feminization is essentially a process of pushing the plant to produce as many female seeds as possible, by making it “think” that it’s approaching its last days.

In order to survive and spread its genetic material as much as possible, plants will mostly make female seeds, and a very small percentage of male seeds, because a small number of males plants can pollinate a colossal number of female plants.

This is why the process of pressuring the plant to produce female seeds en-masse is called feminization.

There are several ways to perform seed feminization. Each one is different, although they all boil down to the same thing — getting female seeds.

Some methods are more efficient than others, which is why they are preferred by numerous producers and growers.

Feminizing seeds with colloidal silver

Colloidal silver is a substance made from microscopic particles of silver, which are suspended in liquid. Particles of silver are less than 100nm (nanometers) in size, and completely invisible to the naked eye.

You can get bottled colloidal silver on Amazon, or you can make it yourself, which is also relatively simple.

If you’re going to use it only a few times don’t bother making it, just order a couple of bottles.

Colloidal silver works by inhibiting female flowering hormones in cannabis. The result of this is that the male hormones dominate, and thus male flowers are produced.

By doing so, you turn your healthy female plants into males. Afterwards, you use the pollen that came off that plant to pollinate the other plants.

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After you pollinate the other female plants, they will produce feminized seeds. This technique is reliant and yields female seeds in huge numbers.

Cannabis is known to yield hundreds (sometimes even thousands) of seeds after being pollinated. The colloidal silver method guarantees that you consistently get feminized seeds.

Here’s how to use it:

Spray colloidal silver on the branches every three days prior to switching the lights to 12/12 and continue spraying it until you start seeing first male flowers.

The more you use it, the more pollen sacks you will get. As the plant matures it will produce pollen that should be collected and used to pollinate other female flowers.

Collect the new seeds and plant them to get the next generation of the same plant.

Feminizing with Gibberellic acid

Feminizing with Gibberellic acid is even easier than with colloidal silver.

Gibberellic acid can also be bought in stores, and it’s mostly available in powder-form.

Gibberellic acid isn’t expensive at all, you can order it online or buy an entire box for as low as $15 bucks.

Mix the gibberellic acid with water so it reaches around 100 ppm (parts per million, the instructions on the packaging will let you know what’s what), and spray that water/acid mix on the plant once a day, for 10 consecutive days during the flowering phase, and male flowers will be produced.

After that apply the pollen from the “gibberellic acid” male flowers on other healthy female plants.

Those plants will yield feminized seeds after being pollinated.

Feminizing with the rodelization method

The rodelization method is by far the slowest, the least efficient, and the least guaranteed to work out of these 3 methods.

Rodelization entails not harvesting flowers after they’ve bloomed, but rather forcing the plant to turn male, in order to preserve itself.

After the plant has flowered, you need to leave it like that for another few weeks. The plant will then stress itself and grow a couple male flowers, in an attempt to pollinate itself once more.

If your plant succeeds, you’ll need to wait an additional few weeks to get decent seeds that are ready for sowing. Keep in mind that this method is not as reliable as the other two, and yields a smaller number of seeds.

This is “nature’s way of feminizing seeds”, although like everything else with nature, it takes a lot of time. A lot more time compared to the gibberellic acid and colloidal silver.

All these factors make rodelization the most natural, but for growers by far the worst possible feminization method.

How To Feminize Cannabis Seeds

If you’re a home grower who grows your cannabis from seed, you need those to be female seeds. In this article, we’ll explain why and also how to feminize cannabis seeds.

Table of contents

What Are Feminized Cannabis Seeds?

Cannabis plants are dioecious beasts, meaning they can be male or female. Although they look the same in the early part of their life cycle, there are marked differences between the two. Male cannabis plants produce male seeds and pollen sacs and have much lower potency than females. For that reason, most people involved in cannabis cultivation want to grow female cannabis plants. Females produce the much sought-after buds that cannabis is harvested for. They’re high in cannabinoids and terpenes and have all the trichomes and other components you need for medical or recreational cannabis use.

Why Make Feminized Cannabis Seeds?

As opposed to regular cannabis seeds, which produce female plants approximately half of the time, feminized seeds only produce females. That means every plant grown from feminized cannabis seeds will be a female, bud-bearing beauty.

Growing cannabis plants from feminized marijuana seeds takes the guesswork out of the gender game and guarantees your plants will be female.

Nowadays, almost all strains of cannabis are available in feminized seed form. This is because seed banks understand that most people buying seeds are more interested in producing cannabis flower. As such, the option to do so is available – although, if you’re a breeder and want to create a breeding programme, these seed banks also sell regular seeds of many popular strains.

How Do You Make Feminized Cannabis Seeds?

The general idea of the feminization process involves forcing female plants to produce pollen. That pollen is used to pollinate other female cannabis plants, resulting in feminized seeds.

There are two main ways to achieve this:

1. Chemically-induced pollen feminization

Of these two options, it’s far better to go chemically-induced. This method is used by professionals and has a significantly higher success rate. It also has a much lower frustration rate than the latter method. Rodelization creates feminized seeds through stress and, as such, can be a risky endeavour that increases the likelihood of hermaphrodite plants – and you don’t want hermie plants.

Marijuana plant and Cannabis seeds in a plate

So how do you feminize cannabis seeds with chemicals? There are several techniques and chemicals that you can use. The main ones are Colloidal silver, silver nitrate, silver thiosulphate, benzothiadiazole, and gibberellic acid. Of these options, colloidal silver is the easiest to get a hold of, but you can also make it yourself without too much difficulty.

Colloidal Silver

Colloidal silver is a solution comprising tiny – microscopic particles of silver suspended in distilled water. It’s sometimes used as a dietary supplement, meaning it’s reasonably easy to get a hold of. You can buy it on Amazon or from health shops. Disclaimer: Never ingest colloidal silver as a dietary supplement without speaking to your doctor beforehand.

Colloidal silver has other uses in horticulture, including as a means of fungal control. In creating feminized cannabis seeds, colloidal silver works by inhibiting the production of ethylene, a naturally occurring hydrocarbon gas. Ethylene is a hormone needed to produce female flowers, so we use colloidal silver to prevent ethylene from effectively making plants female. The result is that the male hormones dominate, producing male flowers. Afterwards, you collect the pollen from the plant and use it for pollinating other plants, producing feminized seeds. Colloidal silver guarantees you consistently get feminized seeds.

The Colloidal Silver Method: Step by Step

  • Begin by acquiring the right strength of colloidal silver, preferably 30ppm (ppm meaning parts per million). It’s available in other concentrations, and 30ppm seems to be the best for the job. Lower than 15ppm will result in male sacs with next to no viable pollen, so go with a higher concentration.
  • Select a plant that has the traits you wish to preserve. Put it into a small pot away from your grow room and give it a day or two to adapt, then put it on a 12/12 light cycle as soon as possible. If using a clone, you’re good, but if you’re growing a plant from seed, wait until the plant has sexed before treating it with colloidal silver. You need to make sure it’s female!
  • Once it begins the flowering stage, spray the plant, or plants, three times a day with colloidal silver, giving them a good soaking. Repeat this process over two weeks, and then leave them to grow as usual.
  • When sexing begins, your plant will develop sex organs – look for male pollen sacs on the bud sites rather than the calyxes and pistils seen in female plants. Look for little green balls appearing first at the top and then lower down the plant. Viable pollen appears within three to four weeks once the plant has been sexed. Collect the pollen and use it to pollinate other female plants. These plants will then yield feminized seeds.
  • Keep your treated plant isolated well away from females. If a pollen sac should burst, it will release millions of spores, and you don’t want them near your girls.
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As soon as you’ve collected the pollen, discard the plants. Do not smoke them, and do not be tempted to try and rinse the colloidal silver off. Silver is a toxic metal, so never smoke the plant. Colloidal silver is absorbed into the plant’s foliage, and that plant is no longer fit for consumption. Toss it in the trash immediately.

Five Best Feminized Cannabis Seeds For Sale

Blue Dream

We’ve never made any secret that Blue Dream is one of the finest elite strains we offer. By crossing Blueberry Ice with a Haze, you get a high-yielding 70% photoperiod sativa strain of superb quality.

It’s a fairly easy strain to grow and performs well indoors or out. Blue Dream can yield as much as gm/m2 indoors, whereas outdoor cultivators can expect up to 850 gm/plant. Blue Dream is a high-THC strain that produces up to 20% THC on its sparkling, resin-covered crystals.

As a sativa, it’s a tall plant that tops out around 350cm in height when grown outdoors, and with a flowering time of around 10 weeks, you won’t have too long to wait for this wonder weed.

Blue Dream is high in alpha-pinene, a monoterpene with therapeutic benefits. Benefits include relief from anxiety, depression, arthritis, inflammation, nausea and pain. The aroma and taste of Blue Dream are lemon-citrus, with berry and Haze notes. The effect of this strain is a powerful and uplifting cerebral one, mentally stimulating but bodily relaxing at the same time.

Purple Ghost Candy

Purple Ghost Candy from Seedsman is an absolute must if you’re looking for the highest of the high THC strains. This is another high-quality strain that delivers a knockout punch like few others.

Purple Ghost Candy is an easy-to-grow cannabis strain, so much so that it’s recommended even for beginners. Make no mistake, though – this is genuinely connoisseur cannabis. It’s another mostly-sativa strain, but it packs an incredible 27% THC!

The aromas and taste of Purple Ghost Candy are every bit as sumptuous as its appearance. Fuel-like in its scent, but the flavours are decidedly fruitier – let those lemon and peachy tones dance on your palate, with earthy mint notes in support. This is an absolute taste sensation.

Purple Ghost Candy’s very high THC content makes for a potent effect. Expect physical relaxation balanced well with cerebral stimulation. The 12-week maximum flowering time of Purple Ghost Candy is longer, but it is most certainly worth waiting for this absolute champ!

Peyote WiFi CBD 2:1

In sharp contrast to the high-THC madness of Purple Ghost Candy, Seedsman proudly presents a unique cannabis strain – Peyote WiFi CBD 2:1. This is an intriguing cross-breed of Peyote Purple, WiFi OG, and Seedsman CBD#2. The result is a high CBD cannabis strain with the power to soothe and relieve for medical consumers.

Peyote WiFi CBD 2:1 is an indica/sativa hybrid with a THC percentage between 5-10%. CBD is between 12-14%, meaning the therapeutic benefits of this strain are free to enjoy without THC’s debilitating psychoactive effects.

Peyote WiFi CBD 2:1 is a hardy and resilient plant that grows well in most climates and has a flowering time of around 65 days. Its benefits include relief from pain, depression, anxiety, and loss of appetite. This unique medical cannabis grows well in all environments.

Strawberry Cheesecake Auto

One of our most in-demand strains, Strawberry Cheesecake Auto is a fast-finishing strain that will automatically begin flowering regardless of light. This strain consistently delights growers thanks to its high yields and big, dense buds.

Coming in at under 200cm, Strawberry Cheesecake is pretty compact, making it ideal for growing in confined spaces. Don’t let the size fool you, though – what it may lack in stature, it more than makes up for in flavour!

Skunky with fruity lemon notes, this strain is an absolute treat on the palate. THC content is around 15%, and its mostly indica nature means the effect is quite physically relaxing but mentally stimulating at the same time. Strawberry Cheesecake Auto is ideal for relaxing daytime use without serious impairment.

Jack Herer FAST

To include something for everyone, Seedsman presents Jack Herer FAST. What better than a legendary old-school strain that’s ready in just seven weeks if you need weed in a hurry?

This speed demon of a plant combines the classic Jack Herer cannabis strain with FAST genetics, reducing the waiting time and bringing top-notch buds to you quicker than ever. Jack Herer FAST is another easy-to-grow strain suitable for beginners and will yield a respectable 400 gm/m2 of high THC (20%) resinous buds.

Jack Herer FAST is a squat plant and will have a limited stretch to just over 100cm. It maintains the sweet peppery taste of the original and is every bit as potent as you’d hope.

Cultivation information, and media is given for those of our clients who live in countries where cannabis cultivation is decriminalised or legal, or to those that operate within a licensed model. We encourage all readers to be aware of their local laws and to ensure they do not break them.

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