Colorado was one of the earliest states to embrace recreational cannabis legalization, and since 2012, it has become a hub for cannabis culture and home cultivation. With adults over 21 legally allowed to grow their own marijuana plants, it’s no surprise that many residents are looking to buy high-quality cannabis seeds.
Whether you’re a seasoned grower or just getting started, knowing where to buy marijuana seeds in Colorado—safely, legally, and with guaranteed results—is essential for a successful grow.
We recommend buying from reputable online seed banks like ILGM, our top choice, and Herbies USA Express, for the best variety, genetics, and customer support.
Online Seed Banks That Ship to Colorado
Ordering cannabis seeds online is the safest and most convenient option for growers in Colorado. While some dispensaries may carry limited stock, they usually can’t compete with the variety and customer service offered by online seed banks.
ILGM
ILoveGrowingMarijuana (ILGM) is our number one recommendation. As a U.S.-based seed bank, ILGM offers fast and free shipping across the country, including discreet packaging to protect your privacy. What really sets ILGM apart is its germination guarantee—if your seeds don’t sprout, they’ll send replacements at no extra cost.
This peace of mind makes them especially popular with beginners.
Their website is easy to navigate and packed with educational resources. You can browse strains by THC or CBD content, climate suitability, yield potential, and more. For those growing in Colorado’s dry climate and high elevation, ILGM makes it simple to find strains that match the state’s growing conditions.
Herbies USA Express
Herbies USA Express is another excellent online source for cannabis seeds that ships quickly from within the U.S. Unlike their international warehouse, the USA Express branch guarantees faster shipping and avoids any customs complications.
Herbies stands out for its massive seed selection, offering hundreds of strains from top breeders around the world.
Each product page includes detailed information such as grow difficulty, flowering time, and yield potential. Their customer support team is responsive, and they frequently run discounts and promotions, making them a cost-effective option.
Local Seed Bank Stores in Colorado (Not Recommended)
Despite Colorado’s long history with legal cannabis, local seed banks and dispensaries are not the best places to buy marijuana seeds. Many dispensaries don’t regularly stock seeds, and those that do often offer a limited variety with no germination guarantees.
Some stores that occasionally sell seeds include Colorado Seed Inc. in Boulder, Kind Love in Glendale, Seeds Here Now in Pueblo, The Farm in Boulder, and Green Dream Cannabis in Denver. While these may be helpful for emergency buys or unique genetics, they generally lack the reliability, support, and pricing benefits of online seed banks.
Additionally, seed availability in local shops fluctuates frequently, and staff may not be equipped to provide cultivation advice. That’s why we strongly suggest ordering your seeds online if you want consistency and quality.
The Legality of Marijuana Seeds in Colorado
Colorado law is very friendly to cannabis cultivation. Adults aged 21 and over are legally allowed to buy, possess, and grow marijuana seeds. You don’t need a medical card to grow weed at home for personal use.
According to Denver’s official marijuana guide, each adult can grow up to six plants at a time, with a maximum of three flowering plants. Regardless of how many adults live in a residence, the total household limit is twelve plants.
All cannabis plants must be grown in an enclosed, locked space that is not visible to the public. This means no backyard grows unless the area is fully enclosed with solid walls and a roof. Also, plants must be kept out of reach of minors.
Cities like Denver have additional rules prohibiting outdoor cultivation altogether, so always check local ordinances before starting your grow.
Is it Legal to Buy & Grow Cannabis Seeds in Colorado?
Yes, it is completely legal to buy and grow cannabis seeds in Colorado for personal use. You can order seeds online, purchase them from dispensaries, or even receive them as gifts. Just make sure you follow the state’s cultivation limits and secure your grow space properly.
The law is clear: adults can grow marijuana, but the number of plants per person and household is strictly regulated. Exceeding these limits could lead to criminal charges. If you live in a rental property, check your lease—some landlords prohibit cultivation even if it’s legal under state law.
Should You Grow Weed Indoors or Outdoors in Colorado?
Both indoor and outdoor cannabis cultivation are viable in Colorado, but each method has its pros and cons based on your environment, goals, and experience. Growing indoors gives you total control over your environment. You can regulate lighting, humidity, and temperature to optimize your plants’ performance.
This setup is ideal for cities like Denver and Boulder, where outdoor cultivation is often restricted. With the right equipment, indoor growers can enjoy multiple harvests per year, higher potency, and greater discretion.
However, indoor setups require more investment upfront, including grow lights, fans, carbon filters, and climate control systems.
Outdoor growing in Colorado can be incredibly rewarding if timed right. The high elevation means intense sunlight and dry conditions, which reduce the risk of mold. On the flip side, spring and fall bring unpredictable weather, including hail and early frosts.
Successful outdoor cultivation requires careful planning—starting seeds indoors in early spring, hardening off seedlings, and transplanting outdoors in mid-May. Protective structures like greenhouses or hoop houses can help extend the growing season and shield plants from environmental stress.
When to Sprout Cannabis Seeds in Colorado
Timing is crucial when sprouting marijuana seeds in Colorado. If you’re growing outdoors, it’s best to germinate your seeds indoors in late April or early May, just after the last expected frost.
This allows your seedlings to develop in a controlled environment before being transplanted outside once nighttime temperatures consistently stay above 50°F.
Indoor growers enjoy more flexibility and can start seeds year-round. Still, many choose to begin in winter to align with seasonal harvest cycles and reduce heat-related issues in the summer. For year-round harvests, staggered planting cycles every 8–10 weeks are common.
Regardless of your setup, always start with clean, healthy seeds and follow a proven germination method. Paper towel germination, seedling plugs, and direct planting in soil are all effective if done properly.
Best Strains to Grow in Colorado
Choosing the right strains for Colorado’s unique climate is key to maximizing yield, potency, and plant health. Below are three of the best cannabis strains to grow in Colorado, selected for their adaptability to high elevation, dry air, and short growing season.
1. Bruce Banner Feminized
A Colorado classic, Bruce Banner was developed with the local climate in mind. This hybrid is known for its massive THC content—often testing over 25%—and its ability to deliver both mental stimulation and physical relaxation. The strain features a genetic blend of OG Kush and Strawberry Diesel, giving it strong resilience and fast flowering.
It typically finishes in 8 to 10 weeks, making it an excellent choice for Colorado’s shorter growing season. Bruce Banner performs equally well indoors and outdoors.
Outdoors, it thrives in the dry climate and intense UV of higher altitudes. Its bushy structure and thick buds produce high yields, especially when supported with proper pruning and training techniques like LST or ScrOG.
Growers love Bruce Banner for its balance of power and productivity. Whether you’re growing under lights or under the sun, this strain will reward you with dense, trichome-coated flowers and a euphoric high that lingers.
2. Green Crack Auto
Green Crack Auto is a fast-growing, sativa-dominant autoflower that’s ideal for Colorado growers seeking a quick, easy, and low-maintenance harvest. With a full lifecycle of just 8 to 9 weeks from seed to harvest, it’s a fantastic option for balconies, patios, or stealthy greenhouse grows.
The strain is famous for its sharp citrus aroma and energetic, uplifting effects—perfect for daytime use.
Its compact height and tight internodal spacing make it ideal for discreet outdoor growing in urban areas, where you might need to keep plants out of sight. It’s also forgiving in drier environments, making it an excellent match for Colorado’s arid summers.
Green Crack Auto doesn’t sacrifice quality for speed. Growers report impressive resin production and solid yields, especially in containers with rich, well-draining soil. If you’re short on time or space but still want high-quality cannabis, this strain delivers.
3. Godfather OG Feminized
Often hailed as one of the strongest indica strains available, Godfather OG boasts THC levels that can reach a staggering 30%. This makes it a favorite among experienced consumers looking for deep relaxation, pain relief, and sleep support.
Godfather OG thrives in indoor environments and controlled greenhouses, where it can complete its flowering cycle in about 8 to 10 weeks. Its dense bud structure and heavy trichome coating make it especially appealing to those interested in making concentrates or hash.
Despite its power, Godfather OG is relatively easy to grow. It’s naturally resistant to mold and mildew, which is essential in Colorado’s unpredictable shoulder seasons. Growers report heavy yields when plants are trained to maximize light exposure.
With proper support, these plants can produce bulky, rock-hard buds that weigh down the branches by harvest time.
Conclusion
If you’re planning to grow cannabis at home, the first step is finding a reliable source of high-quality marijuana seeds. For Colorado growers, the best options are online seed banks like ILGM and Herbies USA Express, which offer excellent genetics, fast shipping, and dependable customer service.
Growing cannabis in Colorado is legal, accessible, and rewarding. As long as you follow the state’s cultivation laws, secure your grow properly, and choose the right strains, you can enjoy a healthy harvest whether you’re growing marijuana plants indoors, outdoors, or in a greenhouse.
Frequently Asked Questions
Where to buy cannabis seeds in Colorado?
The best place to buy cannabis seeds in Colorado is online from reputable seed banks like ILGM or Herbies USA Express. They offer discreet shipping, quality genetics, and germination guarantees.
Is it legal to buy seeds in Colorado?
Yes. Adults 21 and older may legally buy and possess marijuana seeds in Colorado for personal use, whether it be recreational marijuana or medical marijuana for growing.
Is it legal to grow your own weed in Colorado now?
Yes. Home cultivation is legal under Colorado law. Each adult may grow up to 6 plants, with a household cap of 12 plants. Only 3 plants per adult can be flowering at any given time.
How many marijuana plants can you legally have in Colorado?
A maximum of 6 plants per person is allowed, with up to 12 total per household. Only half of those may be flowering at any given time.
Can I grow marijuana outdoors in Colorado?
Yes, but only if your local city or county allows it. For example, outdoor cultivation is banned in Denver unless the plants are grown inside a fully enclosed, locked structure not visible to the public.
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