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male vs female marijuana seeds

Understanding Male, Female, And Hermaphrodite Cannabis

When you grow cannabis plants, they will either turn out as females, males, or hermaphrodites, meaning a hybrid of the two sexes. Knowing the difference between the three is vital to maintaining a strong growing operation, whether you’re planning on crossbreeding strains, maximising the yield of your female plants, or studying each of the types.

A guide to differentiating between male, female, and hermaphrodite cannabis plants.

  • 1. Why does it matter that cannabis is dioecious?
  • 2. Male vs female cannabis: What’s the difference?
  • 3. Hermaphrodites: When cannabis plants become monoecious
  • 4. How to identify different sexes of cannabis plants
  • 4.a. Identifying male cannabis plants
  • 4.b. Identifying female cannabis plants
  • 4.c. Identifying hermaphrodite cannabis plants
  • 5. Types of hermaphrodite cannabis plants
  • 6. How to avoid hermaphrodite plants in your grow room
  • 7. What type of cannabis seeds are good for breeding?
  • 1. Why does it matter that cannabis is dioecious?
  • 2. Male vs female cannabis: What’s the difference?
  • 3. Hermaphrodites: When cannabis plants become monoecious
  • 4. How to identify different sexes of cannabis plants
  • 4.a. Identifying male cannabis plants
  • 4.b. Identifying female cannabis plants
  • 4.c. Identifying hermaphrodite cannabis plants
  • 5. Types of hermaphrodite cannabis plants
  • 6. How to avoid hermaphrodite plants in your grow room
  • 7. What type of cannabis seeds are good for breeding?

From psychoactive cannabinoids to aromatic terpenes, cannabis features many traits that make it unique within the plant kingdom. However, the uniqueness of the plant doesn’t stop at the phytochemicals it produces.

See, the vast majority of plant species are monoecious, a term meaning they possess both male and female reproductive organs. These include edible plants, such as corn and squashes, that can readily fertilise their own flowers using their own pollen.

Cannabis belongs to a minority of species that are dioecious in nature, meaning they produce separate male and female plants. Specifically, it should be noted that only 7% of all angiosperms (flowering plant species) possess this rare and interesting trait.

WHY DOES IT MATTER THAT CANNABIS IS DIOECIOUS?

Cannabis growers and breeders use this trait to their advantage, since it allows them to separate male and female plants. This enables them to prevent the flowers from becoming fertilised and going to seed, which results in better quality flowers, known as sinsemilla.

It also means cannabis growers have more control when it comes to crossing specific males and females together. They can choose two healthy and vigorous specimens, place them close together, and produce progeny that express certain traits.

Let’s take a deeper look into male and female cannabis plants. From there, we’ll see what causes some specimens to develop both male and female reproductive organs.

MALE VS FEMALE CANNABIS: WHAT’S THE DIFFERENCE?

Male and female plants look identical during the seedling and vegetative phases. But, as they begin to transition into the flowering phase, plants finally begin to reveal their sex. During this time, females produce resinous buds loaded with cannabinoids, and males form sacs filled with pollen.

Female cannabis plants are the main focus of casual growers looking to harvest a personal stash. But, depending on their genetics, female plants can look drastically different from one another. Some remain small, producing dense canopies and significant lateral growth. Others grow in excess of 3m, produce massive harvests, and look more like trees than regular garden plants.

Despite their differences, all female plants share one thing in common: they produce flowers. These flowers, colloquially known as buds, possess small glandular structures called trichomes that produce cannabinoids such as THC and CBD.

Male plants, in contrast, don’t produce flowers. This makes them less valuable for growers seeking only buds. However, they do produce pollen sacs. These small vessels create the genetic material required to fertilise female flowers and create hybrids. This makes the males extremely important for breeding new cannabis strains.

It should also be noted that male pollen sacs and female flowers develop at the same point on the plant. Both structures emerge from nodes, the point at which branches meet the main stem. So, when you see buds starting to form on some plants, start looking for pollen sacs too.

Male female preflower

FEMALE PRE-FLOWER

MALE PRE-FLOWER

HERMAPHRODITES: WHEN CANNABIS PLANTS BECOME MONOECIOUS

Cannabis, like those who love it, doesn’t always stick to the rules, though. Sometimes, this dioecious plant species goes against the grain and develops both male and female reproductive organs. These specimens are known as hermaphrodites. Either genetic or environmental factors, or both, can cause plants to develop this unusual trait. Having both buds and pollen sacs, they end up developing the ability to pollinate and reproduce with themselves.

Of course, growers want to avoid this phenomenon if they’re aiming for the best flowers possible. We’ll dive deeper into what causes hermaphroditism and how to avoid it below.

HOW TO IDENTIFY DIFFERENT SEXES OF CANNABIS PLANTS

The ability to determine plant sex as early as possible is a critical skill for cannabis growers. As you develop this eye for identifying plant sex, you will be able to prevent any accidental pollination.

  • The goal: find the males and move them out of your grow room or garden as quickly as possible. The sex of a plant becomes fairly obvious during the early flowering stage, but time is of the essence in that regard. The quicker you can identify and remove male plants, the more you reduce the chances of accidental fertilisation.

IDENTIFYING MALE CANNABIS PLANTS

Growers identify plant sex by identifying pre-flowers, which are small structures that form at the nodes during late vegetation.

During the early flowering stage, take a stroll around your grow room or garden with a magnifying glass or jeweller’s loupe. Inspect a few nodes on each plant to see how far along into the flowering process they are. At this stage, you won’t see any obvious flowers or pollen sacs. Instead, you’re looking for young pre-flowers. Although these tiny structures look similar, they have distinct features that allow growers to tell them apart.

Male pre-flowers look like tiny green eggs or “balls”. These young pollen sacs will look smooth and won’t possess any fine hairs, or any distinct point. Later into the flowering stage, pollen sacs begin to form larger and denser clusters. They’ll become easy to identify with the naked eye by this point. However, pollen sacs usually begin to disperse their contents around 2–3 weeks after forming. Be sure to remove them from your space with haste if you don’t plan on crossing your plants.

Male female preflower

MALE CANNABIS

IDENTIFYING FEMALE CANNABIS PLANTS

Female pre-flowers also develop at the nodes. You can distinguish them based on one obvious visual characteristic: hairs. Female pre-flowers feature tear-drop shaped calyxes with small hairs protruding from the tip. These small hairs, known as pistils, are the sex organs of female cannabis flowers.

These protruding structures are designed to capture pollen, which leads to fertilisation. They stick out away from the flower to capture pollen from the air, and to await being brushed up against by pollen-covered insects.

Within a matter of weeks, these small pre-flowers swell into dense nuggets and begin churning out cannabinoid and terpene-rich resin. Since you the removed males and prevented pollination, your flowers will continuously produce resin until the end of the growing cycle.

Male female preflower

FEMALE CANNABIS

IDENTIFYING HERMAPHRODITE CANNABIS PLANTS

Several factors can cause female plants to start to develop pollen sacs—or exposed stamens—alongside their flowers. This trait means that plants don’t need to rely on a nearby male to burst their sacs and fertilise them. As we’ll discuss in a bit, this is actually a savvy survival mechanism and a display of nature’s genius. However, hermaphrodites aren’t desirable in the grow room or garden. Now, let’s discuss both types and how to avoid the issues they cause.

TYPES OF HERMAPHRODITE CANNABIS PLANTS

Hermaphrodite cannabis plants come in two different forms: true hermaphrodites and “bananas”.

The former features distinctly male and female reproductive organs. Upon close inspection, you’ll notice pollen sacs occupying some nodes, and female flowers residing at others. When the pollen sacs rupture, the pollen will displace into the flowers, and the plant will effectively breed with itself. From there, it’ll go to seed and produce the subsequent generation.

“Banana” hermaphrodites get their name from their physical characteristics. Instead of producing separate organs, they develop a bare pollen-producing stamen within the female flower. This naked appendage drops pollen directly onto buds to ensure self-reproduction. These stamens share a similar shape and colour to a certain tropical fruit, hence their name.

CANNABIS HERMAPHRODITES

BANANA HERMAPHRODITES

TRUE HERMAPHRODITES

HOW TO AVOID HERMAPHRODITE PLANTS IN YOUR GROW ROOM

Hermaphroditism stems from two major driving factors: stress and genetics. In regards to stress, hermaphroditism serves as a survival mechanism. If a plant experiences damage, heat, disease, or nutrient deficiencies, they start to freak out. Essentially, plants get the impression that their time is up. In a last-ditch attempt to reproduce, they decide to stop waiting around for a male and get the job done themselves.

To avoid this issue, try to maintain a stable environment in your grow room. Use a thermo-hygrometer to monitor temperature and humidity, keep your light schedule strict, and ensure your plants get all the nutrients they require.

Even if you have all of these bases covered, plants can still pollinate themselves due to poor genetics. Plants with a bad genetic history and too much genetic variation are prone to becoming hermaphrodites. For this reason, it’s important to shop with reputable companies that offer high-quality seeds with stable genetics.

WHAT TYPE OF CANNABIS SEEDS ARE USED FOR BREEDING?

If you want to try breeding, you’re going to need regular cannabis seeds, and Royal Queen Seeds offers a premium range. In contrast to feminized seeds that produce only female specimens, regular seeds offer a 50% chance of the plant being male or female.

These seeds provide breeders with an army of males and females to experiment with. Cross the very best specimens together to create your own unique strains that match your taste. However, if you’re growing for nothing but buds, you can still use them for their stable and trusty genetics. As you may know, regular seeds provide excellent mother plants to produce clones and amazing yields. You’ll have to spot male plants, but the payoff will be more than worth it.

Cannabis plants can be male, female, or hermaphrodites. Knowing the difference can make or break your cannabis operation. Find out their differences inside!

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

Friday August 17, 2018

Growing

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?

Interested in growing? Click here to purchase your own seeds and start growing today!

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.

Male vs. Female

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.

Male Plant

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

Erin Hiatt

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.