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Breeding male marijuana for seeds

How to Select Male Plants for Breeding & Seed Making

Often when selecting a male for breeding you should be looking for the same things you would generally like to find in a female plant. Look for vigorous males, in terms of growth rate and also root mass.

Selecting for Leaf & Plant Structure

Structure is very important. You want a plant with a sturdy structure that can hold some serious weight on its branches. As my males grow, I test their branch strength by pushing down on the middle of the branch with one finger with medium pressure. If it breaks, I cull the plant — don’t waste your efforts on a weak male. Remember, you’re looking to improve your cannabis in the hybrid, incross, or backcross you’re making, not water down its quality or strength.

Leaf structure is also important. Depending on what you’re looking for, you may or may not want fat-bladed leaves that can block light from the canopy. In most cases, I prefer thinner leaves and a high flower-to-leaf ratio in males. I’m shooting for something easy to trim that lets a lot of light and airflow penetrate to lower in the canopy.

Scent Matters

I look for males with the most smell in the vegetative stage. I like to rub the stems and see what smell comes off. Some plants will leave your fingers sticky with resin from rubbing the stems. Some stand out males will smell so strong in veg you won’t even need to rub the stem to notice how much the smell stands out.

What Male Flowers Show You About the Plant

The male flowers will tell you a lot about its potential in terms of yield, potency, health, etc. Things to look for:

  • Are the male flowers dense?
  • Do the male flowers get powdery mildew or mold if left untreated or in moist conditions? By growing enough males, you will see that some are more susceptible and others more resistant to these issues. Of course, choose the more resistant plants.
  • Are they big, fat clusters of flowers or are they smaller and thin?

When the flowers open, look for males that release copious amounts of pollen. You will see that some males release average amounts of pollen, but if you grow enough males you will see some true studs that produce an abundance of pollen. I’ve seen real stand out males drop insane amounts of pollen — ounces and ounces. Those males have always passed on large yielding plants from their seeds.

It’s About Timing

I’ve heard that the earliest to show sex and produce male flowers is something to avoid in males, unless your main goal is to shorten flower time. Some say the earliest males result in less potency in the progeny. I like to see early, fast flowering males, but I usually avoid using the very first to show sex and blow pollen.

Male Trichomes Do Exist

Do your male flowers develop trichomes? You don’t see it a lot, but when you do it’s exciting. I have heard some breeders say they think potency in males leads to less potent females in the next generation. Don’t listen to these breeders. Potency x Potency = Potency, at least in my experience. Pretty simple concept.

Selecting a Male For Your Breeding Needs

Sometimes knowing what you’re looking for is key. If you’re trying to preserve a certain female and looking for a male to use, you should look for a male that will pass on recessive traits so the female’s traits can dominate. It’s always a guess what’s recessive, but in this case I look for vigor and strength and less smell from a stem rub in the male.

Most of the time I’ve done this in a first generation hybrid, the majority of the plants grow flowers with characteristics dominant of the female with an improved yield and vigor. Of course, knowing what traits a male will pass on is always a guess until running the progeny. But by knowing the strain you’re selecting the male from, you can make an educated guess based on knowledge of the strain and observation.

Want Better Seeds? Grow More Plants

The best advice I can give is to grow more plants and plant more seeds. With your average cannabis seeds, you may be lucky to find a special male in 10–20 seeds. Grow 50–100 seeds of a strain and you’ll find something special.

It’s even more important to start with good seed stock. Know your source. The truth is, the cannabis seeds market is completely unregulated, so do your research on breeders and their practices. Keep in mind that average genetics will grow average cannabis. Growing from top notch seed stock is a must. Most plants will be worth growing, and choosing breeding males is much easier when you start with quality.

After making F1 hybrids and test growing them, you will learn which breeding selections were successful plant combinations and which ones were maybe not ideal. The experience is invaluable and you’ll learn a lot about the genetics you’re working with.

Make a Breeding Plan

Try to plan your goals ahead of time when you’re breeding or making seeds. Visualize what you’re trying to accomplish and spend time with your plants, really getting to know them. Observation is key, as it builds experience, intuition, instinct, and understanding. The better you get to know your plants, the more they will tell you and the more you will learn and understand.

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I could keep going, as I love talking about breeding and male selections. But I’ll save some more for another time. At this point at Rebel Grown, we no longer use just one male from each strain for breeding. We open pollinate with several males selected from each strain to ensure the best of the genetics are passed on, instead of relying on just one selection and its genes and traits. I’ll break down our breeding practices and seed making process in a future read.

Anyone can make their own cannabis seeds and everyone should. With time you can make amazing seeds and grow your own unique creations for a lifetime!

Cannabis Breeding: How Are New Strains Created?

While browsing Leafly’s strain database, you may wonder what a cross of this and that strain is, what a hybrid or a backcross is, or what a parent strain is. All of these have to do with plant breeding—essentially, breeding a male and female plant to combine or refine the genetics of two plants or strains. Breeding two different strains often results in a new strain, or hybrid.

Cannabis breeders typically breed to purify and strengthen strains, combine strain traits, or enhance specific characteristics.

Cannabis breeders typically breed to purify and strengthen strains, combine strain traits, or enhance specific characteristics like higher yields, specific aromas, potency, and many other things.

When growing and breeding, it’s important to know where your seeds come from and what kind of genetics they have. If the seed breeder can’t give you a detailed history of how a packet of seeds was bred or what they were crossed with, you never really know what you’re getting.

Plant breeding is a fundamental process of growing cannabis. Breeding is highly technical and typically done on a commercial scale, but with legalization increasing, breeding is becoming more popular. You can even do it yourself.

The Basics of Breeding

Cannabis plants can be either male or female. Cannabis consumers are mainly concerned with female plants, because only females produce the sticky buds that we all know and love. But male cannabis plants are important for the breeding process, as they are needed to pollinate the bud-producing females.

Take the strain Super Lemon Haze as an example. It’s a hybrid (or a “cross”) of Super Silver Haze and Lemon Skunk—these are the parent strains. At some point, the breeder decided that they liked some attributes of Super Silver Haze and some of Lemon Skunk and decided to combine the two.

To do this, you need a male of one strain to pollinate a female of the other. Once pollinated, the female will then produce seeds that express the genes of both the male and female plant. Those seeds will be harvested and grown separately, and voilà: You have created a hybrid.

So how do you know whether to pick a male or a female of each strain that you’re crossing?

“Often in cannabis, the traits of the female carry over to progeny (seeds) more than the male. That said, the traits of the male are often obvious to the discerning grower so one should definitely choose a male that will complement the traits of the female,” says Nat Pennington, founder and CEO of Humboldt Seed Company who’s been breeding cannabis for 20 years. “So much is possible with truly intentional breeding strategies.”

How to Breed Cannabis Plants

After two parent strains are selected for breeding, a male and several females are put into a breeding chamber to contain the pollen. A breeding chamber can be as simple as an enclosed environment with plastic sheeting on the sides, or a specially designed sterile environment for large-scale breeding.

“A healthy male can pollinate up to 20 females, and by pollinate, I mean absolutely cover the plant with seeds.”

A single male plant can pollinate tens of females. “It’s always a good idea to have only one male, genetically speaking, per pollination effort,” says Pennington. “A healthy male can pollinate up to 20 females, and by pollinate, I mean absolutely cover the plant with seeds.”

This is intentional breeding—any grower who’s accidentally grown a male and pollinated a crop will know that one male can easy pollinate hundreds of females, filling your whole crop with seeds.

Once in the breeding chamber, you can grow the plants vegetatively for a few weeks to let them get bigger, but it’s not necessary. Put them on a flowering light cycle: 12 hours of light, 12 hours of dark.

The mature male will grow pollen sacs within the first couple weeks of its flowering phase. Pollen will release from the sacs, move through the air, and land on the female plants, pollinating them. Having an enclosed breeding chamber is important to contain the pollen and also to prevent outside pollen from getting in.

You can also help along the pollination effort by shaking pollen from the male onto the females, or by collecting pollen from the male and directly applying it to the females. These female plants will continue to grow and flower, during which they’ll grow seeds (as well as buds). These seeds will express the genetics of both the male and female plant.

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When the seeds are mature, they are harvested and stratified (or dried). “The secondary process of maturation happens after the plant is dead, and the seed needs to be stratified before it will germinate,” says Pennington. “In general, harvest for flower takes place three to four weeks before harvest for seed.”

These seeds—now a hybrid of the two parent strains—will be grown on their own, outside of the breeding environment.

Phenotypes

But the process doesn’t end there. The hybrid strain that you buy at the dispensary has likely gone through many rounds—or generations—of breeding to strengthen its genes and to ensure that its descendants are healthy and consistent.

Just as you and your sibling might have different physical attributes from your parents, each seed created from a round of cross-pollination will have different attributes from its parent strains. Maybe you have your father’s eyes and your mother’s hair, but your sister has your mother’s eyes and hair. Each cannabis seed is unique and will express different traits, and different combinations of traits, from one or both of the parent strains. These seeds with various expressions are called phenotypes.

Homozygosity ensures that a plant will consistently produce the same seeds with the same genetic makeup over and over again.

A plant that produces a set of phenotypes that have a lot of variety are said to be heterozygous. With cannabis, you typically want seeds that are homozygous—ones that have the same set of genes. Homozygosity ensures that a plant will consistently produce the same seeds with the same genetic makeup over and over again, ensuring that buyers and consumers will get the same plant or seed time and again.

After a strain is crossed, a breeder will then have to select which phenotype of the new strain they like best. For large-scale growers, they want to choose the best phenotype for mass production.

Back to the Super Lemon Haze example: This strain takes a lot of its bud structure, trichome and resin production, and overall appearance from Super Silver Haze. But it takes its flavors and aromas from Lemon Skunk.

Lemon Skunk also tends to grow extremely tall and has loose buds, whereas Super Silver Haze grows smaller and has denser buds. Through selecting specific phenotypes, a breeder can pick one that has the attributes they want to keep. In this case, a phenotype that has the structure and bud density of Super Silver Haze and the flavors and aromas of Lemon Skunk.

Most likely, there were early phenotypes of Super Lemon Haze that grew tall and loose like Lemon Skunk, or tasted more like Super Silver Haze. But the breeder discarded those phenotypes and keep growing the ones that have the attributes of what we now know is Super Lemon Haze.

Backcrossing

High-quality breeding still doesn’t stop there. Once a breeder has crossed a strain and narrowed down a phenotype and finally has the one, they will usually backcross that strain to strengthen its genetics.

Backcrossing is a practice where a breeder will cross-pollinate the new strain with itself or a parent—essentially, inbreeding the strain. This makes the strain more homozygous, and strengthens its genetics and desirable characteristics, and also ensures that those genes continue to pass down from generation to generation.

The hybrid that you bought from the dispensary has gone through months and even years of growing, crossing, and backcrossing, as well as a selection process to pick the best phenotype of that strain.

Breeding is about time and patience. Says Pennington: “To be a breeder, you have to be willing to accept the fact that you won’t have uniformity in the offspring, [you’ll get] lots of ugly ducklings in the hunt for your golden goose. To make seeds that will actually reflect the golden goose takes time, and it takes more than just a one-off cross. Even after you found your golden goose, expect to have to do a whole number of stabilizing backcrosses to reproduce your golden goose in seed form.”

How To Easily Breed Seeds And Create New Cannabis Strains

Maybe it’s not every growers ambition to start their own seed company – and nobody’s saying you should. Though it can be pretty cool to create your own cannabis strain. Just imagine you’d be the one creating the next Tangerine G13 or Amnesia Haze – or another legendary, award-winning weed variety.

Imagine you’d be the one creating the next Tangerine G13!

Creating own cannabis varieties is pretty easy too and could potentially be a green goldmine. Even if you don’t create the next Super Silver Haze on your first try, it is still worth trying. Cross-breeding your own weed strains is very educative and results in a huge collection of cannabis genetics. Meaning you might hold seeds to strains that are no longer being produced – to cultivate or cross-breed with.

Crossing Weed Strains

There is one thing you definitely need if you’re planning to breed your own weed strains: male cannabis plants. Unless your plan is to make feminized cannabis seeds, which is a different story we’ll dive into another time. To recognize and distinct male from female (and hermaphrodite) weed plants, have a look here.

Because although you can grow male cannabis plants in the same room as female cannabis plants. It’s important to separate the males before their flowers open, releasing their pollen into the room, to avoid uncontrolled fertilization.

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Rest assured, there is no need for a separate grow room for the male plants to develop from there. As a flowering male can be held under a simple lightbulb or simply in the windowsill. Furthermore, you can even cut off a few branches and put them in a vase to collect the pollen a week later. Regular Cannabis seeds create male and/or female plants.

Selecting Parents For Your Strain

The trick to select the perfect male weed plant is to have good and above all trained senses. Because it’s up to you to see which male has the best growth and the most attractive (or present) aroma.

Hollow stems on male cannabis plants may indicate high THC-production in its offspring

Obviously, only select male cannabis plants with a nice structure and a healthy root system. If possible, cut off a few branches in search of hollow stems. As a hollow stem in weed plants is often an indicator for high THC-production in the plants.

Male plants that are quick to flower are often dominant in passing on their genes – so it’s best to leave those be. Late-bloomers however, carry recessive genes.

Crossing your female plant with late-blooming males will therefore retain the desired characteristics from your fem – instead of your cross turning into a copy of your male parent. If you’re serious about selecting the right male, make sure you have a separate room for them. As there you can leave them to flower longer, to discover more about their grow characteristics.

How To Collect Cannabis Pollen

Now you’ve selected the right male, it’s time to collect its pollen. A pretty easy job considering the plant is eager to release its pollen to fertilize female plants. Simply shake a branch with open male flowers above a sheet of (black) paper or a plastic container. And the pollen will fall down from the flower onto the desired surface.

Make sure there are no vents on and windows are closed though. As the male cannabis pollen is designed to travel with wind – and in this case we’re trying to contain it to not fertilize the wrong (or too many) female plants. Also avoid working with your female plants right after this job, as pollen easily sticks to your clothing and hair.

Fertilizing Female Weed Plants

Selecting the ideal female cannabis plant is easier than selecting males. As you can truly judge the fruits before you put in the labor. To guarantee a stable plant, try growing her out of seeds and cultivate it from clone too. Thereafter, you can choose the characteristics you like to see in your own creation(s). Be sure to take aroma, structure, flowering time, esthetics, taste and effect into account – as those are the most important elements to look for in a good cannabis plant. Logically, only select the best of the best females to create your own weed seeds with.

Simply use a paint brush to pollinate your female cannabis plant, with the collected male pollen. [Image: Gracie Malley / Cannabis Now]

Pollinating your female cannabis plants is as easy as collecting male pollen. Preferably wait until the plant(s) you want to fertilize are three to five weeks into their flowering period. Then take the selected female out of the grow room, again, to avoid uncontrolled pollination of the rest of the plants. Label one or more branches to fertilize, to know which plant was crossed with which and when. And use a clean (paint) brush to apply the pollen on one or more branches for seed production – leaving the rest of the flowers to produce seedless weed: sinsemilla.

Deactivating Cannabis Pollen

About three hours after fertilization, it is time to deactivate the leftover pollen on the plant. You can do that by simply spraying your plant with water. Be sure to change your clothes and have a shower after this, before you place the fertilized female back in the room.

After fertilization, you can let your cannabis plants fulfill their flowering period until they are ready to harvest. The seeds are fully grown after two to six weeks, but can stay in the bud and hung to dry after harvest. Your home grown cannabis seeds then require another month before they’re ready to be germinated – preferably with our favorite germination method.

Be sure to keep an eye on them once they start flowering, as you’ve now produced ‘regular cannabis seeds’. This means your plants can turn both male or female when they enter the flowering stage. Providing you with what you need to further stabilize your creation into the perfect weed strain.

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