ILGM Best Strains: The Must-Have Seeds This Year

For years, beginner and expert growers alike have looked to ILGM (I Love Growing Marijuana) as the best cannabis seed breeders.

They’ve practically become a digital home for growers—recently announcing the launch of an AI grow assistant, a seed finder app, and a community platform to connect fellow cultivators.

As the market-leading and top-ranked cannabis seed bank in the United States, there’s no better time than now to check out their 2025 catalog. And yes, all of their seeds have a 100% germination guarantee.

This time around, we’re diving into the top 5 ILGM seeds for hobbyists and professional cultivators alike. Our criteria? In no particular order:

• Flavor
• Effects
• Potency
• Reviews
• Popularity
• Yield potential
• Ease of growth

From new releases to best sellers, these are the best strains ILGM has to offer in 2025. Get your space ready—these high quality cannabis seeds are here to deliver a good time.

• THC: 25%
• Growing Difficulty: Beginner
• Indoor/Outdoor: Both
• Flowering Time: 8-10 weeks
• Yield: 14-17 ounces 

A cult classic. This fan-favorite strain has never done me dirty, always coming through with long-lasting relaxation and a buzz that feels like a weighted blanket.

Granddaddy Purple is a powerful West Coast Indica. And I mean pure Indica. It’s a cross between Purple Urkle and Big Bud, which are two pure Indica strains on their own. The result? A heavy-hitting old-timer.

Climate: Although it can be grown indoors and outdoors, Grandaddy Purple is highly sensitive to environmental factors like humidity and temperature—so choose your space carefully. It’s particularly suitable for the following climates:

• Sunny
• Continental
• Mediterranean

If that’s you, try cannabis cultivation outdoors. This plant is impressively disease-resistant. For indoor grows, some say it’s easier to cultivate, considering it produces the best results in humidity-controlled environments around 50%.

Grow Details: Grandaddy Purple can grow up to 60 inches upward, with indoor harvest time around 8-10 weeks. Outdoors, expect to harvest around late October.

Effects: This is one of the most relaxing strains on the market. Since it’s a pure Indica, bred by two heavy Indicas, you can sort of guess what you’re getting into. However, it’s worth noting that it doesn’t produce mega couch-lock. Sure, it might, after 3-4 sessions. But it’s an excellent choice for a mild yet satisfying buzz with a case of euphoric giggles and munchies.

GDP’s Medical Benefits: There are several impressive medical benefits associated with the Grandaddy Purple strain:

• Stress relief
• Combatting insomnia
• Managing chronic pain

Its mind-body relaxation and uplifting nature make it a great choice for maximum relief.

Flavor & Aroma: The flavor and aroma of Grandaddy Purple offer similar experiences, with a juicy mouthful of grapes on the inhale crossed with fresh-pressed wine and citrus fruits. If you’ve got a sweet tooth, this is right up your alley.

• THC: 21%
• Growing Difficulty: Beginner
• Indoor/Outdoor: Both
• Flowering Time: 8-9 weeks
• Yield: 18 ounces

These calming buds are a breeze to grow. If you’re after relaxing effects that calm every inch of your body from head to toe, try growing Gorilla Glue #4.

Its 21% THC content might seem mild for seasoned users, but its well-rounded effects and mouthwatering flavors have landed this sticky strain a few notable awards:

• Winner of the Jamaican World Cup by High Times
• 1st place at the Los Angeles Cannabis Cup 2014
• 1st place at the Michigan Cannabis Cup 2014

Made by crossing parent strains Chem’s Sister, Chocolate Diesel, and Sour Dubb, these genetics produce some deeply immersive, euphoric effects.

Climate: Perfect for both indoor and outdoor grows, GG#4 has a high resistance to disease and best performs in warm and dry environments. Just keep her away from extreme weather changes, and she’ll keep growing.

Grow Details: While the average yield of GG#4 is around 18 ounces per plant, you can likely reach 21 ounces when grown outdoors and let it flower for a couple of weeks longer. On average, it takes 8-9 weeks of flowering time indoors and outdoors.

Effects: This calming Indica strain hits in all the right places. Euphoria, happiness, long-lasting upliftedness—it’s the perfect strain for any time of day. Just a warning: you’ll definitely get the munchies. But paired with the strain’s breezy effects, it’s totally worth it.

Flavor & Aroma: This strain’s flavor profile is complex and intriguing—with hints of black coffee, sweet moss, and pine after a summer’s rainfall. This unique blend of flavors and aromas makes it particularly sought after for edibles, considering how well they blend with chocolates and sweets.

• THC: 25%
• Growing Difficulty: Beginner
• Indoor/Outdoor: Both
• Flowering Time: 8-9 weeks
• Yield: 14-18 ounces

This is a relatively new strain, and Archive Seedbank was originally bred in 2016. It’s become beloved in the weed world for its high THC content and relaxing 70:30 Indica:Sativa ratio.

Do-si-dos‘ potent Indica-leaning high is a result of parent strains, Girl Scout Cookies phenotype OGKB (OG Kush Breath), and Face Off OG. Lucky for you, it’s pretty easy to grow.

Climate: Whether grown indoors or outdoors, Do-si-dos thrives in sunny, semi-humid climates. ILGM explains how the environment should be a balance of arid and moist, with daytime temperatures between 70℉ and 80℉.

Grow Details: This plant can literally tower over you, so be sure you’ve got the space. Indoors, expect it to reach a comfortable 2.6ft to 3.3ft (80-100cm). Outdoors? She can grow over 8ft—that’s 2.5 meters. If you don’t already have one, it might be worth investing in a fence to keep away peering eyes.

Effects: Ever heard of the dance, the Do-si-do? It’s French for two figures dancing in circles back-to-back. It’s honestly the perfect representation of the synergistic effects and euphoric energy provided by the strain. Expect to ride a wave of upliftedness that settles into moments of focus and, later, deep relaxation.

Flavor & Aroma: An incredibly flavorful strain—Do-si-dos offers hints of lime and pine alongside its core scent of diesel and a subtle layer of freshness. Since this strain is equally aromatic, it will definitely dank up your space. Indoor growers might want to consider leveling up their smell-proof processes.

• THC: 19%
• Growing Difficulty: Moderate
• Indoor/Outdoor: Mainly indoors
• Flowering Time: 9-12 weeks
• Yield: 21 ounces

While moderately challenging to grow, Amnesia Haze is extremely rewarding. It’s an earthy-citrus Sativa-dominant hybrid with a comfortable THC content of around 19-21%.

What’s most impressive about this Sativa Cup and Cannabis Cup winner is its origin, tracing back to Jamaican, South Asian, Hawaiian, Afghani, and Thai landrace strains:

• Thai Sativa
• Haze Sativa
• Hawaiian Sativa
• Jamaican Sativa
• Cambodian Sativa
• South Asian Indica
• Amnesia Haze Indica

Climate: Don’t get me wrong—you can grow Amnesia Haze indoors and outdoors. But the former is tough. This strain requires lots of sunlight and warmth, between 72 to 80 degrees in Mediterranean, mild, and sunny climates. It’s also very susceptible to pests, so it’s better left indoors.

Grow Details: If you plan on growing weed for the retail market, this strain isn’t a great choice. It has a longer flowering period of 9-12 weeks with moderate difficulty. Indoors, expect 9 weeks to harvest with 21 ounces per yield. Outdoors (in favorable environments), you can reach 25 ounces per plant in late October.

Effects: The blend of Sativa and Indica genetics produces a perfectly balanced hybrid with a first wave of creativity, energy, and euphoria. After about an hour, it settles into a general feeling of upliftedness and focus—perfect for checking off daily tasks.

Flavor & Aroma: Pucker up because these hints of lemony sweetness and tangy citrus will have your mouth watering. Its aromas and flavors offer similar experiences for a consistent sensory experience.

• THC: 21%
• Growing Difficulty: Expert
• Indoor/Outdoor: Both
• Flowering Time: 9-10 weeks
• Yield: 16 ounces

Sour Diesel is a fascinating strain—if you can manage to grow it. This Sativa-dominant hybrid is a California legend, and its origins and heritage are quite a mystery.

Some say it was bred between Super Skunk and Chemdawg 91, offering some insane genetics for an energizing experience. With about 60% Sativa and 40% Indica, Sour Diesel’s long-lasting, dreamlike high remains unmatched.

Climate: This strain best performs in sunny and Mediterranean climates where it’s generally warm. However, it’s also prone to powdery mildew, so outdoor groos can be tough. A general rule of thumb for growing Sour Diesel is less humidity and more warm, dry air.

Grow Details: Growing Sour Diesel indoors requires replicating its favorite Mediterranean environment, which can be done with high-intensity lights in a dry, sterile room. If grown outdoors with proper sunlight, it can grow pretty big, with harvest around November.

Effects: If you love bright-eyed, buzzy effects, Sour Diesel is for you. It packs an immersive cerebral experience with effects of happiness, elation, and mental stimulation. Users love its fast-acting and long-lasting effects, not to mention its anti-anxiety genetics and feel-good nature.

Flavor & Aroma: Upon first whiff, you’ll notice heavy aromas of pungent diesel—enough to make your mouth water. But Sour Diesel actually tastes pretty different from how it smells. Expect notes of citrus lemon and balanced herbs alongside notes of tropical pineapple and papaya.

Successful cannabis cultivation—whether for personal use or commercial production—starts with selecting the right seeds. While indoor vs. outdoor growing plays a big role in your setup, seed choice directly impacts yield, flowering time, and overall ease of growth.

Just like choosing the right cannabis product to suit your needs, different seeds are designed for different growing goals. Whether you’re working with limited space, looking for faster harvests, or ensuring an all-female crop, here’s a breakdown of the most common cannabis seed types—and which one is right for you.

Autoflowering seeds grow some of the easiest plants to work with. What’s special about them is their genetics, which contains the automatic flowering species Cannabis ruderalis.

That means they naturally transition from the vegetative stage to flowering about 2-4 weeks after germination.

Who Should Use Them?

This variety of seeds is undoubtedly great for beginners or experts seeking a simpler growing process.

Some other potential scenarios where autoflowering seeds are useful include:

• Growers with smaller spaces
• Those in regions with shorter summers
• People who don’t want to manage light cycles
• Anyone looking for multiple harvests per season

Choose Autoflowering Seeds If

You want a fast, easy grow cycle without feeling like you’re tending to a newborn baby. If you’re after resilience, ease, stealth, and speed, autoflowering seeds are your best bet.

This is another relatively easy type of cannabis seed to work with, considering it only grows female plants.

Feminized seeds are specifically designed to make your grows easier by eliminating male genetics and only producing flower-growing females.

Who Should Use Them?

Feminized cannabis seeds are all about efficiency. You never have to “weed out” the males again. If you want to save time and effort, these seeds are for you.

They’re also great for:

• Growers who want to maximize space
• Those who don’t want to waste resources
• Anyone looking to simplify the growing process
• People who don’t care to breed their own strains

Choose Feminized Seeds If

You don’t want to go through the hassle of identifying between male and female plants.

If you want to ensure that all plants are packed with cannabinoid-rich buds, feminized seeds are definitely the most efficient way to go.

Regular cannabis seeds are unmodified, naturally occurring seeds that have an equal 50/50 chance of developing into male or female plants.

Unlike feminized or autoflowering seeds, regular seeds require growers to identify and remove male plants if they want to prevent pollination and seed production. While this might seem like extra work, regular seeds offer genetic purity and are essential for breeding new strains or preserving rare genetics.

Who Should Use Them?

As mentioned, regular cannabis seeds are perfect for breeders looking to create new strains. Some other situations include:

• Those seeking the full natural experience
• People looking for wider phenotype variety
• Growers who want to produce their own seeds

Choose Regular Seeds If

You’re into breeding, want to produce your own seeds, or are looking for the most natural expression a strain can deliver. They’re also great for selecting and preserving specific traits.

Fast-flowering cannabis seeds—often labeled as “Quick” or “Fast Version” strains—are a hybrid between photoperiod strains and autoflowering genetics. This cross reduces flowering time while still allowing plants to respond to light cycles like regular photoperiod strains.

Unlike full autoflowering plants, which begin flowering automatically based on age, fast-flowering seeds still require a 12/12 light cycle (12 hours of light, 12 hours of darkness) to trigger flowering.

However, they bloom faster than standard photoperiods, often cutting 1-2 weeks off the flowering stage without compromising yield or potency.

Who Should Use Them?

You can think of fast-flowering cannabis seeds as another “best of both worlds” situation. You get the speed of autoflowering plants with the impressive yields of photoperiods.

They also work for:

• Commercial cultivators maximizing annual harvests
• Growers in regions with short summers or early frost
• People who want to beat mold/rain season outdoors

Choose Fast-Flowering Seeds If

You want the best of both worlds—faster harvest times without sacrificing too much yield or potency.

They’re perfect for outdoor growers in less-than-ideal climates or anyone looking to speed up their growing cycle.

If you prefer to experience cannabis through its non-psychoactive effects, high-CBD seeds are for you.

These seeds might contain THC, but their key component is high levels of relaxing, non-intoxicating, therapeutic CBD.

Who Should Use Them?

High-CBD strains are particularly beneficial for medical patients who prefer to experience the benefits of cannabis without an overwhelming buzz.

They’re also useful for:

• Those who want to avoid THC-induced paranoia and anxiety
• People in areas with THC restrictions but legal CBD

Choose High-CBD Seeds If

You’re mainly interested in the therapeutic benefits of low-to-no THC, you don’t want to get significantly intoxicated, or you’re in a THC-free area where CBD is allowed.

These are practically premium cannabis seeds—coveted in the weed world among connoisseurs and growers. Landrace strains are thousands of years old and come from their native regions, usually in Central Asia, the Middle East, and the Hindu Kush mountain range.

They haven’t been modified or intervened with human breeding—they’re sought after for their unique expression of their native roots.

Who Should Use Them?

Besides the fact that growing a landrace strain is pretty darn cool, here are a few other situations why someone might want to pick up these seeds:

• Breeders wanting unaltered genetics for new strains
• Experienced growers looking for unique genetics
• Those interested in weed history

Choose Landrace Seeds If

You want in on a slice of cannabis history. Landrace strains are also hot for breeders looking for pure genetics to work with or the connoisseur who appreciates the significance of OG strains.

If you’re looking for some of the most complex genetics and unique characteristics you can find, look to Polyhybrids.

These strains are made by crossing not just one but multiple hybrids to create a rich genetic profile. In fact, the hybrid strain you’re smoking right now is likely a polyhybrid.

With all the intense breeding in today’s modern industry, most strains for sale often fall under the poly category.

Who Should Use Them?

Want maximum terpenes? Grow a polyhybrid strain. Their extensive genetic background gives them impressive blends and terpene percentages.

Polyhybrids will also work for:

• Growers looking for specific trait combinations
• Those wanting the strongest, most flavorful strains
• Anyone wanting maximum THC or unique cannabinoid profiles

Choose Polyhybrids If

You prefer puffing on the most potent, mouthwatering strains you can find. Also, choose polyhybrids for specific growth traits or something more complex than what regular seeds have to offer.

Generally, breeders work with S1 (Selfed) seeds, which are pretty complex to create.

These seeds are made by forcing a female plant to produce pollen through chemicals and/or stress. Then, its own pollen is used to either pollinate itself or another cutting of that same female plant.

It’s essentially creating an exact genetic copy.

Who Should Use Them?

Breeders and those looking to grow the same strains with consistent potencies and terpene profiles.

S1 seeds are also good for:

• Preserving genetics
• People who want to “backup” a quality cutting
• Breeders working with rare or clone-only strains

Choose S1 Seeds If

You want to create exact replicas of a female plant, preserve genetics, or grow a “backup” strain.

Usually, cannabis plants have two sets of chromosomes—but not triploids. These seeds contain three sets, which are created through intense breeding.

Although, they won’t usually produce seeds themselves. They’re mainly grown for their unique makeup.

Who Should Use Them?

Triploid seeds add a layer of convenience for growers, especially in the retail market. They don’t produce seeds, meaning handling and packing them is easier than their seed-filled counterparts.

These seeds can also be used for:

• Anyone interested in modern breeding
• Those wanting more cannabinoids in their plants
• People looking to experience the originality of 3 chromosomes

Choose Triploid Seeds If

You’re growing cannabis for sale and prefer to go seedless, you’re interested in the added concentration of cannabinoids, or you simply want to explore the unique characteristics that modern breeding has to offer.

Choosing which seeds are right for you takes some grower’s reflection. Ask yourself:

How Experienced Am I?

Beginner? Get the best of both worlds and start with an autoflowering feminized seed. You won’t have to weed out the males, and your plants will flower automatically. It’s a win-win.

As you get more familiar with the process, start experimenting with regular seeds, landrace seeds, and more.

Where’s My Setup?

Find a suitable space to grow your plants, be it indoors or outdoors.

Depending on which you choose, refer to the above section for more information on choosing which seeds are suitable for specific environments.

Do I Have Time Constraints?

In a pinch and need weed in 8-10 weeks? Autoflowering and fast-flowering seeds will grow buds pretty quickly.

If you’re in it for the long haul, try experimenting with time-consuming strains for a more immersive experience.

What’s My Goal?

Always check the cannabinoid contents of the original strain your seeds came from. It’s the best way to predict your experience.

Medical users or seasoned recreational connoisseurs might want high-THC polyhybrids, whereas others may enjoy the calming nature of CBD-rich strains.

What’s My Budget?

If you’re looking to save big and grow big, regular seeds often cost the least. Next up is autoflowering and feminized, with landrace and triploid seeds typically costing the most.

The reality is that quality matters a lot more than which type of seed you’re using. Marijuana seed banks like ILGM have been supporting happy cultivators since 2012 with superior genetics and a 100% germination guarantee.

For your next grow, ILGM is the way to go.