Types of Cannabis Seeds: Do You Know Them All? A Complete Guide

Want to learn about cannabis seeds? A complete guide to types and differences

4 key characteristics that determine the type of cannabis seed

When people in the cannabis community talk about the “type cannabis seeds”, they usually mean a combination of several characteristics.

In practice, four different factors are combined, which together determine how well the plant will thrive, how quickly it will complete its life cycle, and what its final cannabinoid profile might be 👇 :

 From a grower’s perspective, the biggest decision points are 👇:

An illustrated monkey wearing a cap ponders the different types of cannabis seeds—photoperiod vs. autoflowering; the CannabiZoo logo is shown at the bottom right

🌱 Flowering Type (Photoperiod vs. Autoflowering/Day-Neutral)

Some varieties wait for a change in light (photoperiod), while others are as impatient as meerkats 🐿️ and bloom on their own regardless of day length (autoflowering).

Cannabis sativa (Cannabis sativa L.) is described in scientific literature as an annual “short-day” plant. This means that long days promote growth, whereas shorter days trigger flowering.

That is why growers in indoor cultivation usually switch to a shorter light cycle to induce flowering.

However, modern research shows that the response to photoperiod can vary depending on the specific cultivar, so universal rules may not always apply equally to all varieties.

♀️♂️ Plant sex (feminized vs. regular)

Cannabis is a dioecious plant, meaning there are male and female plants. That is why seed banks offer two basic types of seeds:

  • Regular seeds: a natural mix, approximately 50% male and 50% female.
  • Feminized seeds: bred so that the majority of plants are female. Many breeders report roughly 95% or more females.

⏱️ Cycle completion speed

Another characteristic is the speed at which the plant completes flowering.

  • Some varieties have a genetically shorter flowering time (e.g., around 7–8 weeks).
  • The label “fast version” usually refers to a photoperiod plant into which some autoflower genetics have been mixed to make the entire cycle finish faster.

🧬 Chemotype and Target Cannabinoids

The final factor concerns which cannabinoids the plant produces.

A chemotype refers to the genetically determined profile of these compounds, such as the ratio of cannabinoids like THC and CBD in the plant’s flowers.

For example, CBD-rich strains (seeds rich in CBD) are bred to have a higher proportion of CBD and a low proportion of THC in their flowers, or a balanced ratio of cannabinoids (such as 1:1 THC:CBD).

An illustrated monkey wearing a hat examines CBD-rich hemp seeds through a magnifying glass; the CannabiZoo logo is shown at the bottom right

6 Types of Cannabis Seeds: Do You Know Them All?

There are 6 main types of cannabis seeds, which differ in their flowering patterns, genetic traits, or breeding objectives.

Below you’ll find an overview and their basic characteristics. For easier reference, the individual types are summarized in clear tables 📊.

☀️🌙 Photoperiod seeds

Cannabis sativa L. is a “short-day” plant—long days promote vegetative growth, while shorter days trigger flowering 👇.

Definition Photoperiod cannabis triggers flowering based on day and night length.

Longer days support growth, shorter days trigger flowering.
Light cycle (indoor) Most growers switch to 12 h light / 12 h darkness to support flowering.

However, some cultivars can flower even with longer days (e.g. up to around 14 h of light).
Seed types Feminized cannabis seeds, regular cannabis seeds and fast flowering.
Flowering time Most commonly around 8–9 weeks, fast lines about 7 weeks, some sativa/haze varieties can take significantly longer.
Advantages Maximum control over vegetative length and plant size.

Allows for high yields, as the plant can grow longer before switching to flowering.
Disadvantages Sensitivity to light cycles – light leaks or interruptions of the “night” can affect flowering.

Outdoor growing may be limited by the length of the season.
Strain characteristics Suitable for indoor growers who want to control plant size, and for outdoor areas with a sufficiently long season.
Example strains Sensi Seeds Northern Lights Feminized: flowering time 45–50 days, compact, indoor-friendly, indica-dominant photoperiod genetics.

Royal Queen Seeds Northern Light: flowering time 55–60 days, feminized, photoperiod, datasheet with height and yield for indoor/outdoor.

ℹ️ You can find a brief summary of key information in the datasheet. It’s a short “profile” that highlights the most important parameters without a lengthy description.

For cannabis seeds, the datasheet typically includes, for example, 👇:

  • Flowering time / time from seed to harvest
  • Genetic type (feminized, autoflowering, fast-flowering, regular)
  • Dominance (Indica / Sativa / hybrid)
  • Plant height
  • Indoor/outdoor yield
  • Possibly THC / CBD ratio or genetic origin

♀️ Feminized seeds

Feminized seeds are bred to produce primarily female plants that produce flowers. They are among the most popular types of seeds among growers 👇.

Definition Feminized seeds are bred so that they grow into predominantly female plants.
How they are created A female plant can be stimulated to produce pollen (“female pollen”), which is then used to pollinate another female plant.

The resulting seeds then have a very high probability of producing female offspring.
Sex probability In high-quality lines, it is often stated that approximately 95% or more will be female plants.
Growth and flowering time Feminization itself does not determine the cycle length – there are feminized photoperiod and autoflowering varieties.
Advantages More efficient use of space and time – growers usually don’t need to remove male plants.

Very practical especially for smaller indoor growing setups.
Disadvantages Stability depends on the quality of breeding.

In less stable lines, hermaphrodite traits may appear (development of male flowers at the end of the cycle).
Strain characteristics Ideal for growers who want to maximize production of female flowers without selecting males, especially in indoor cultivation.
Example strains Silent Seeds Critical Jack Feminized: flowering time about 60 days (~8–9 weeks), feminized photoperiod genetics, sativa-dominant hybrid (Critical+ × Jack Herer), very high yield up to around 625 g/m² indoor, vigorous growth and suitable for indoor and outdoor.

Royal Queen Seeds Amnesia Haze Feminized: flowering time about 10–11 weeks, feminized photoperiod genetics, sativa-dominant haze hybrid, medium-tall plants (80–140 cm), yield up to 600–650 g/m² indoor.

♀️♂️ Regular cannabis seeds

Regular cannabis seeds are natural seeds produced through the normal pollination of a female plant by male pollen. As a result, these seeds typically produce approximately half males and half females 👇.

Definition Regular seeds are created through natural pollination of a female plant by male pollen.

The result is approximately 50% male and 50% female plants.
Plant sex Unlike feminized seeds, there is a natural ratio of male and female plants.
Growth and flowering time Just like feminized seeds, regular seeds themselves do not determine the cycle length.

Many regular strains are photoperiod, with a typical flowering time of around 8–9 weeks (depending on genetics).
Advantages They produce male plants, which are essential for breeding, crossing and preserving genetic lines.
Disadvantages For growers focused on flowers, males can be a disadvantage. They take up space and, if pollination occurs, can reduce the production of seedless buds (sinsemilla).
Strain characteristics Most useful for experienced growers and breeders who want to work with selecting parent plants or create their own genetics.
Example strains Sensi Seeds Sensi Skunk® Regular: flowering time 45–50 days, regular photoperiod seeds, indica-dominant hybrid (Skunk #1 × sweet mother line), suitable for indoor and mild outdoor climates.

T.H.Seeds™ S.A.G.E.™ ’n Sour Regular: flowering time approx. 9 weeks (~63 days), regular photoperiod, sativa-dominant hybrid (S.A.G.E. × Sour Diesel), taller plants around 120–140 cm, suitable for indoor and outdoor.

⚡ Fast-flowering seeds (fast version)

In practice, you’ll encounter two similar terms 👇:

  • fast flowering: generally refers to a short flowering period in photoperiod strains
  • fast version: a specific type of photoperiod genetics that utilizes some autoflowering traits to speed up the flowering process. Some breeders classify this as a separate category.
Definition Fast flowering strains are usually photoperiod plants that have been bred to finish flowering faster than the original genetics.
Genetics The fast version label often refers to photoperiod genetics with a partial share of autoflower genetics, which speeds up the completion of the cycle.
Typical flowering time Approximately 6–8 weeks, often about 1–2 weeks faster than the original photoperiod version of the same strain.
Advantages Faster harvest, lower risk of problems at the end of the outdoor season, and the ability to shorten the growing cycle in indoor cultivation.
Disadvantages Results may be more dependent on specific genetics and line stability.

“Fast” is not a universal guarantee – traits may vary depending on the breeder.
Strain characteristics A good choice for outdoor growing in regions with shorter seasons or for indoor growers who want a shorter cycle while keeping photoperiod plant behavior.
Example strains Fast Buds Wedding Cheesecake FF: flowering time 7–8 weeks (≈49–56 days), FF photoperiod feminized genetics, sativa-dominant hybrid (Wedding Cake × Cheese × Wedding Cheesecake Auto), suitable for indoor and outdoor.

Blimburn Seeds Gorilla Glue G4: flowering time approx. 7–9 weeks, fast flowering photoperiod feminized genetics, sativa-dominant hybrid derived from Gorilla Glue #4, strong resin production, suitable for indoor and outdoor growing.

ℹ️ Early-flowering varieties offer growers an attractive compromise between traditional photoperiod strains and autoflowering genetics, as they retain light-cycle control but allow for a faster harvest.

🌱 Autoflowering cannabis seeds (day-neutral)

Autoflowering strains are bred to begin flowering based on the plant’s age, not on the length of day and night.

As a result, they do not require a change in lighting schedule, which is necessary for photoperiod strains 👇.

Definition Autoflowering strains begin to flower automatically based on plant age, not based on shortening daylight.
Genetics This type was created by adding genetics from Cannabis ruderalis, which allows flowering independently of photoperiod.
Typical cycle time Approximately 8–11 weeks from seed to harvest, with some fast strains finishing in around 10 weeks.
Advantage Short and relatively predictable cycle, simple growing without the need to change light schedules, and the possibility of multiple harvests in one season.
Disadvantages Short life cycle means less time for recovery from stress.

Plants are usually smaller and often produce lower yields than large photoperiod plants.
Strain characteristics A good choice for outdoor growing in regions with shorter summers or for indoor growers who want a simple cycle without strict light control.
Example strains Royal Queen Seeds Amnesia Haze Auto: 80–85 days from seed to harvest, autoflowering feminized genetics, sativa-dominant hybrid (Amnesia Haze × ruderalis), height approx. 50–100 cm, high yield up to around 400 g/m² indoor.

The Bulldog Seeds TB Lemon Haze Auto: 50–55 days of flowering (approx. 65–70 days total), autoflowering feminized genetics, sativa-dominant hybrid (Lemon Skunk × Silver Haze × ruderalis), height around 100 cm, yield approx. 450–500 g/m² indoor.

ℹ️ With autoflowering strains, it’s important for the plant to get off to a good start because the cycle is short, so early stress can more easily affect the final size and yield.

🌾 CBD-rich cannabis seeds

CBD-rich seeds are bred so that the plants produce flowers with a higher cannabinoid content CBD.

These are typically strains with low THC or a balanced THC:CBD ratio (e.g., 1:1) 👇.

Definition CBD-rich cannabis seeds are bred so that plants produce flowers with a higher CBD content.
Chemotype (genetic cannabinoid profile) Plants are genetically bred for higher CBD production and often low THC content.
Growth and flowering time CBD content does not determine the cycle length – there are photoperiod and autoflowering CBD-rich varieties.
Advantages Allow growers to cultivate plants with a targeted cannabinoid profile.
Disadvantages CBD and THC levels may vary depending on the specific line, so it is important to choose reliable breeders and stable genetics.
Strain characteristics When choosing seeds, focus mainly on the THC:CBD ratio, growth type (photoperiod or autoflowering), and breeder reputation.
Example strains Royal Queen Seeds Painkiller XL Feminized (High CBD): flowering time approx. 8 weeks (~56 days), CBD-rich photoperiod feminized genetics, sativa-dominant hybrid (Royal Highness × Juanita la Lagrimosa), THC:CBD approx. 1:1 (about 9% / 9%), compact plants with high yields up to 500–550 g/m² indoor.

Sensi Seeds Skunk Dream CBD Feminized: flowering time 70–75 days, CBD-rich photoperiod feminized genetics, sativa-dominant hybrid (Skunk #1 / Sensi Skunk × Alpine Delight CBD), very low THC (~0.25%) and high CBD ratio (approx. 1:26), tall plants with yields up to 550–600 g/m² indoor.

ℹ️ The seeds themselves usually do not contain CBD or THC – these compounds are mainly found in the resin of the flowers.

Cannabis genetic types: sativa, indica, hybrid, and ruderalis

The terms sativa, indica, and hybrid are used in practice as a general description of the plant’s appearance and growth style. However, these are not precise scientific categories of effects.

Due to long-term crossbreeding of modern varieties, these types often overlap, and the plant’s true character is more determined by specific genetics, cannabinoids, and terpenes 🌿.

Ruderalis differs slightly from these types—it is a genetic group of cannabis originating from the colder regions of Eurasia, known primarily for its ability to flower regardless of day length. It is precisely this trait that is utilized in the breeding of autoflowering strains.

Overview of cannabis genetic types and growing characteristics

The following table summarizes the main genetic types of cannabis and their typical growing characteristics 👇.

Type Growth characteristics Flowering time Characteristics Famous strains
Sativa Taller, slimmer plants with narrower leaves, often showing significant growth during the transition to flowering (“stretch”). Usually longer flowering, often several weeks more than indica. Require more space and light, often suitable for larger indoor spaces or warm outdoor climates. Sour Diesel,
Jack Herer,
Durban Poison
Indica Shorter, more compact “bushy” growth, wider leaves and denser buds. Usually shorter flowering than sativa. A good choice for indoor, smaller spaces or faster harvests.

Dense buds can be more sensitive to humidity and mold.		 Northern Lights,
Bubba Kush,
Granddaddy Purple
Hybrid A combination of sativa and indica traits; appearance and growth vary depending on the specific genetics. Very variable. The most common type of modern strains.

Best evaluated based on the datasheet (flowering time, height, recommended climate) of the specific strain.		 Blue Dream,
White Widow,
OG Kush
Ruderalis Smaller, hardy plants from colder regions, often with a short life cycle. Short cycle. Genetic base for autoflowering strains. Lowryder,
Auto AK-47,
Auto White Widow

ℹ️ Today’s autoflowering strains were developed by crossing traditional strains with Cannabis ruderalis, which gives them the ability to flower regardless of day length.

Comparison of 6 types of cannabis seeds

In this table, you’ll find all types of seeds neatly listed side by side. And don’t forget to check out the FAQ section as well.

Seed type Flowering Sex Cycle time Best for
Photoperiod based on day length feminized/regular approx. 8–10 weeks of flowering when the grower wants control over plant growth and size
Feminized based on specific genetics almost always female plants varies by strain if the grower doesn’t want to deal with male plants
Regular based on specific genetics approx. 50% male / 50% female varies by strain suitable for breeding and working with genetics
Autoflowering based on plant age mostly feminized approx. 8–11 weeks from seed for easy growing and faster harvest
Fast flowering based on light cycle mostly feminized about 1–2 weeks faster than standard photoperiod for shorter outdoor seasons
CBD rich based on specific genetics varies varies by strain if the grower wants plants with higher CBD content

FAQ

1. What is the difference between photoperiod and autoflowering cannabis seeds?

Photoperiod seeds begin to flower when the days get shorter and the nights get longer. For indoor cultivation, the lighting schedule is therefore typically switched to approximately 12 hours of light and 12 hours of darkness.

Autoflowering seeds are not dependent on day length—the plants begin flowering automatically based on their age, usually a few weeks after germination.

2. What is the difference between feminized and regular cannabis seeds?

Feminized seeds are bred to produce predominantly female plants that produce flowers. This means growers usually don’t have to worry about removing male plants and can use their growing space more efficiently.

Regular seeds are produced through natural pollination of a female plant by male pollen and yield approximately half male and half female plants.

This type of seed is mainly used for breeding new varieties or preserving genetic lines.

In short 👇:

  • Feminized seeds → mostly female plants, suitable for general cultivation.
  • Regular seeds → natural ratio of males to females, suitable mainly for breeding.

3. What is the difference between indoor and outdoor cannabis cultivation?

🏠 Indoor cultivation takes place in a controlled environment under artificial lighting, where the grower can regulate light, temperature, and humidity (for more precise control over plant growth).

Suitable strains and seed genetics 👇:

🌄 Outdoor cultivation takes place outdoors, and plants are dependent on natural conditions such as day length, weather, or the length of the growing season.

Suitable strains and seed genetics 👇:

4. Why do growers monitor the sex of cannabis plants?

Cannabis is a dioecious plant → there are male and female plants. Female plants produce flowers, while male plants produce pollen.

If pollination occurs, female plants will begin to form seeds, and the production of seedless flowers will decrease.

Therefore, growers often remove male plants or use feminized seeds to minimize the risk of pollination.

5. What are the legal limits for growing and possessing cannabis in the Czech Republic?

According to the amendment to Act No. 270/2025 Coll., effective as of January 1, 2026, the rules for growing and possessing cannabis for personal use in the Czech Republic are changing.

For persons over the age of 21, the following limits apply, for example:

  • possession of cannabis in a residence: up to 100 g
  • possession of cannabis outside a residence: up to 25 g
  • cultivation of cannabis for personal use: a maximum of 3 plants

Exceeding these limits may be considered a misdemeanor.

Criminal liability may arise, for example, when growing more than 5 cannabis plants or when possessing a larger quantity of cannabis (e.g., more than 200 g in a residence or 50 g outside a residence).

⚠️ This information is for informational purposes only and does not constitute legal advice. Laws may change and always depend on the specific situation.

6. What cannabis seed brands can I find on CannabiZoo?

On CannabiZoo, you’ll find cannabis seeds from well-known seed banks around the world 👇:

Each seed bank focuses on a slightly different style of genetics—some are known for classic strains, while others specialize in autoflower, CBD, or fast-flowering strains.

⚠️ Cannabis seeds are sold on CannabiZoo as collectibles. When purchasing and using them, it is always important to respect the current laws in your country.

7. Which cannabis seeds are the cheapest?

Generally speaking 👇:

  • The cheapest are usually regular seeds, because their production is simpler.
  • Feminized seeds tend to be more expensive due to the feminization process.
  • Autoflowering or special genetics (e.g., CBD-rich) may also be more expensive, as these are specifically bred varieties.

However, the price always varies depending on the specific seed bank, strain, and package size.

 

Sources:

  

Author: Patricie Mikolášová

 

 

Photo: AI

The content of this article is intended for informational purposes only. The information provided should not be construed as legal or medical advice. Readers are advised that the cultivation, possession, and use of cannabis may be subject to legal restrictions and regulations in various jurisdictions. Specifically, the cultivation of cannabis plants that contain 0.2% or more of tetrahydrocannabinol (THC) or other psychoactive substances may be considered illegal and subject to criminal penalties, depending on the country and its specific laws.

This article is intended for those interested in the ethnobotanical and collecting aspects of cannabis seeds. Any mention of cultivation or usage is for educational and informational purposes only and should not be interpreted as encouragement or endorsement to engage in illegal activities.

It is the reader's responsibility to understand and comply with the laws and regulations governing cannabis in their respective country or region. The authors and publishers of these articles do not assume any responsibility for the actions of readers who choose to cultivate, possess, or use cannabis in violation of local laws. Furthermore, while we strive to provide accurate and up-to-date information, we do not guarantee the germination or any other characteristics of cannabis seeds discussed in these articles. The sale of cannabis seeds and related products is intended for adults over 18 years of age.

By accessing and reading these articles, you acknowledge and agree to this Disclaimer.

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