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how to tell if seeds are female

Can You Tell if a Cannabis Seed is Male or Female?

Friday August 17, 2018

W hen it comes to growing cannabis, sex is important. Not that kind of sex! We’re talking gender, as in being able to discern male from female. The reason for this is simple enough: only female seeds produce flower, also known as the buds you might have in your stash as we speak.

When it comes to growing cannabis, seeds can be male, female or hermaphrodites. Females produce the resin-secreting flower, and males make small sacs of pollen near the base of the leaves. Over the years, cultivators have learned that un-pollinated females (remember, males produce pollen) continue to make resin and flowers that have not been pollinated are much more likely to produce high-potency cannabis. But is there a way to know if a seed is female before growing?

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Determining if a Seed is Male or Female

If what you’ve got is a handful of seeds, it’s pretty much impossible to tell which ones are male or female. The only way true way to tell the plant’s gender is to plant some seeds, then wait. After a period of several weeks, it will begin to pre-flower, or form a small bud in the crux of a branch. One of the first signs your cannabis plant is female is the appearance of pistillates that are wispy and generally white in color.

If you’re looking for more precise, science-based methods to tell your plant’s gender, there are several labs that can sex your plant right after germination – eliminating the lengthy (usually around 6 weeks) wait to learn its gender. Portland, Oregon start-up Phylos Bioscience is in the business of studying cannabis genetics, and they sell a “plant sex kit” that’s pretty simple to do, even for the not scientifically-inclined. Simply press a cotyledon, or embryonic leaf, onto the kit’s filter paper and send it to their lab. They then test the leaf for the “Y” chromosome to determine its gender, just as would happen for a human male.

What are Feminized Seeds?

While it’s basically not possible to determine the sex of a seed from a random bag of seeds, a practice known as feminizing is becoming quite popular. Feminized seeds are selectively bred to produce female plants, however, some growers do worry about some feminized seeds turning into hermaphrodites.

Despite the potential for hermies, if growing cannabis is more hobby than full-time endeavor, and you want to guarantee you’ll have some consumable product, knowing your seeds are female from the beginning is probably your best bet.

There are many companies that sell feminized seeds, but, buyer beware, do your research to make sure the seller is reputable, especially if purchasing online. Thanks to modern technology, most feminized seeds from reliable brands will be 100% female as advertised – but that doesn’t mean there aren’t people selling low-quality seeds out there.

Methods for Feminizing Cannabis Plants

If you have some experience growing cannabis and would like to bend a crop to your will to ensure that the seeds will be female, there are a few feminizing methods you might try. One such technique is to literally stress out a healthy female plant by interrupting the light cycle during flowering, called Rodelization Feminizing.

In the colloidal silver feminizing method, distilled water is mixed with pure silver and sprayed on female plants. This method works best when the plants are flowering. This results in pollen sacs being formed, which will allow the seeds to produce female plants.

Feminizing via the silver thiosulfate technique involves carefully selecting a nearly mature female plant, then spraying it with 50/50 mix of sodium thiosulfate and silver nitrate. This triggers a gender change, from female to male. Place this plant back with the others to pollinate other female plants, and female seeds are created.

How Important is Your Plant’s Sex?

How much time you want to spend figuring out the sex of your cannabis plants really depends on how much time and energy you’d like to devote to growing your own marijuana. If you are a medical cannabis patient or caregiver, for example, and need to know what kind of cannabis you are getting every time, buying feminized seeds from a trusted seller is the way to go. But, if you have some time, consider yourself a green thumb, and want to experiment with your grow, you could simply plant your seeds and see what comes up. Happy growing!

What are your thoughts on feminized seeds? If you’ve used them before, how did it go? Share your experiences in the comments below!

Erin Hiatt is a New York City-based writer who has been covering the cannabis industry for more than six years. Her work – which has appeared in Hemp Connoisseur Magazine, PotGuide, Civilized, Vice, Freedom Leaf, MERRY JANE, Alternet, and CannaInvestor – covers a broad range of topics, including cannabis policy and law, CBD, hemp law and applications, science and technology, beauty, and psychedelics.

If you're interested in growing cannabis, determining the sex of your plant is a critical aspect in the cultivation process. Learn whether or not you can tell if a marijuana seed is male or female and more information about feminized seeds.

Sexing Cannabis: How to tell if your plant is male or female?

If you grow regular cannabis seeds you will find the resulting plants to be a mix of male and female cannabis plants. Apart from breeders, most people discard the male plants as soon as they are identified. This prevents them pollinating the female plants, which would fill the buds with seeds.

But before you throw any plants away, you need to be confident about the differences between male and female cannabis plants. Identifying male and female cannabis is known as sexing cannabis plants.

Difference between male and female cannabis plants

Most people grow cannabis for the potent buds. That means growing female cannabis plants. Male cannabis plants do produce THC, but not generally in the amounts worth the inconvenience of growing them. Few people (other than cannabis breeders) want to see seeds in their cannabis buds.

Female plants produce the buds we are familiar with. Male plants produce small pollen sacs, these look like small balls. When they open they look like miniature bananas, releasing cream-coloured pollen dust.

What does a hermaphrodite cannabis plant look like?

Hermaphrodite cannabis plants, also known as ‘hermies’, display characteristics of both male and female cannabis plants. Just like males plants, hermaphrodite cannabis plants are also usually removed from grow rooms to prevent pollination (and therefore unwanted seeding) of buds.

Sexing cannabis plants pictures

Male vs female cannabis plants look different and grow a little differently too. Male plants are often taller, giving them a pollen distribution advantage when their pollen sacs eventually open. The pollen sacs form at the nodes on the stem. Pollen can be collected and frozen if required e.g. for breeding purposes.

Pictures of male and female cannabis plants are a useful reminder to the novice grower should there be any doubt identifying male and female cannabis plants. Sexing cannabis, and understanding the difference between male and female cannabis plants prevents the disappointment of finding seeds in your buds later.

Male cannabis plant picture

Female plants produce the buds familiar to cannabis growers. Ensuring that no pollen is present keeps the buds seed-free, just the way the connoisseur grower likes it! Male or female cannabis seedlings can’t usually be separated/identified by sight alone. Cannabis professionals sometimes use DNA testing of leaf material from a young cannabis plant to determine whether it is male or female. This gives the professional cannabis grower the opportunity to identify his cannabis plants as male or female many weeks before the plant sex would normally be revealed.

Those interested in learning more about the various forms of DNA testing of cannabis plants may wish to check out Delta Leaf Laboratories. As well as offering a $10 DNA test for plant sex, they can also test for the types of future cannabinoids that are likely to be produced by your plants.

Cannabis sex is usually clearly visible soon after the plant is placed in bloom conditions. However, the observant cannabis grower may also occasionally notice that some plants can be identified during veg growth.

Male and female cannabis can be grown from regular seeds. Feminised seeds tend to give rise to around 95% female plants. Images of male and female cannabis plants are useful if the less experienced grower is unsure. Cannabis male female identification is an easy skill to learn.

Female cannabis plant picture

Hermaphrodite cannabis plant pictures can show varying numbers of pollen sacs. Small numbers of them can be plucked off and the plant can be saved. Heavily affected hermies are often simply removed. Any seeds produced by cannabis hermaphrodite plants should be treated with caution – they may give rise to hermaphrodite cannabis plants if germinated.

Hermaphrodite cannabis plant picture

How and when to tell if your cannabis plant is male or female

If you grow from feminised cannabis seeds or autoflowering seeds you may rarely see male plants. Male pollen sacs are easy to see, allowing males to be easily identified. Sexing cannabis pictures are a useful reference if you are new to the subject.

Sometimes, if bloom has only recently begun, it can be difficult to know for sure if you have male or female cannabis plants. If unsure take another look a day or two later, it may be easier to tell the difference.

Male and female cannabis seeds

Simply looking at a cannabis seed appearance can’t tell you whether you will have male or female plants in future. Only the genetics inside the seed will determine the final plant type.

Some old school growers and breeders prefer to use regular cannabis seeds which will produce male and female cannabis plants. But 95% of cannabis seeds sold are feminised seeds or autoflower seeds. These will usually only produce female plants.

Few cannabis growers can be bothered with the hassle of producing their own seeds. It’s easier to buy the best cannabis seeds they can get from a seedbank they can trust. If you grow good quality photoperiod feminised seeds, or autoflower seeds you should be assured of female plants and a great harvest.

Want to know the difference between male and female cannabis plants? Read on to know what sexing cannabis is and how hermaphrodite cannabis plants look.