Cannabis Sensei

Where to Buy Marijuana Seeds in Colorado (Safely)

By Aaron Girard · · Updated

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Colorado voters legalized recreational cannabis for adults in 2012, and Colorado residents 21 and older can grow a few plants at home. Many of them want good seeds to start with.

Whether you're a seasoned grower or just getting started, it helps to know the rules before you buy. We recommend online seed banks like ILGM, our top choice, and Herbies USA Express, for variety and grower support.

Online Seed Banks That Ship to Colorado

Ordering cannabis seeds online is the most convenient option for most Colorado growers. Some stores carry seeds, but selection is usually limited.

ILGM

ILoveGrowingMarijuana (ILGM) is our number one recommendation. ILGM ships within the United States from a U.S. warehouse, in discreet packaging. It also offers a germination guarantee; check the current terms on its site.

Its website has grow guides and lets you browse strains by type and traits.

BUY SEEDS AT ILGM

Herbies USA Express

Herbies USA Express is the U.S. storefront of Herbies, a large seed shop. Its site advertises free shipping in 2 to 4 days, free seeds with every order and a 90-day germination guarantee.

Herbies carries seeds from many breeders, and product pages list details such as flowering time and difficulty.

SHOP HERBIES USA

Some Colorado stores sell seeds or clones, but many don't stock seeds regularly, and those that do may have a small selection with no germination guarantee.

Local breeders can still offer interesting genetics, and Colorado Seed Inc.’s Hibiscus Sunrise is one worth knowing before you shop locally.

Seed availability in local shops changes often, so online seed banks are usually more consistent.

The Legality of Marijuana Seeds in Colorado

Colorado allows adults 21 and older to grow cannabis at home for personal use. You don't need a medical card for this.

According to the Colorado Department of Public Health and Environment, Colorado residents over 21 can grow up to six plants each, with up to three flowering at one time. Counties and cities can pass stricter limits; Denver, for example, caps a home grow at 12 plants even if three or more adults live there.

If you're across the border, our guide to buying marijuana seeds in New Mexico covers how the state handles home grow limits under its own Cannabis Regulation Act.

Plants must be kept in an enclosed, locked area that can't be viewed openly. The state health department says this means the plants can't be outside.

In homes with residents under 21, the grow area must be enclosed and locked in a separate space that minors can't access. Homegrown cannabis can't be sold.

Always check local ordinances before starting your grow, since local rules vary.

Is it Legal to Buy & Grow Cannabis Seeds in Colorado?

Under state law, Colorado residents 21 and older can grow cannabis for personal use within these limits. Exceeding plant limits can lead to criminal charges, and landlords can ban growing in rentals.

Seeds are a legal gray area. Under the current federal hemp definition, seeds at or below 0.3% delta-9 THC can count as hemp, which is why seed banks sell them as souvenirs.

A new definition in P.L. 119-37 counts total THC, including THCA, and excludes viable seeds above 0.3% total THC. The Congressional Research Service says that part now takes effect December 11, 2026.

Under federal law, marijuana remains a Schedule I controlled substance. A Federal Register rule published April 28, 2026 moved FDA-approved drug products containing marijuana, and marijuana covered by a state medical marijuana license, to Schedule III. Any other form of marijuana stays in Schedule I.

Should You Grow Weed Indoors or Outdoors in Colorado?

Because Colorado requires plants to be in an enclosed, locked area that isn't openly visible, most home grows are indoors. Indoor growing gives you control over light, humidity and temperature.

Indoor setups require equipment such as grow lights, fans, carbon filters and climate control. Colorado's health department advises having lights and electrical equipment installed by a licensed electrician to prevent fire hazards, and using only CO2 generators that are safe for indoor use.

Good ventilation also matters. The state recommends plenty of ventilation and walls that don't absorb water, to prevent mold.

When to Sprout Cannabis Seeds in Colorado

Indoor growers can start seeds year-round. Staggered planting lets you keep a steady cycle while staying under the flowering limit of three plants per person.

Whatever your setup, start with healthy seeds and a proven germination method. Paper towel germination, seedling plugs, and direct planting in soil all work if done properly.

Best Strains to Grow in Colorado

Here are three popular strains for indoor growers. Potency, yields and flowering times vary by grower and batch.

1. Bruce Banner Feminized

bruce banner - colorado

Bruce Banner is a popular, potent hybrid known for strong effects and dense buds.

It is grown both indoors and in controlled environments, and training techniques like LST or ScrOG help manage its canopy.

Growers like Bruce Banner for its balance of potency and productivity.

CHECK PRICE AT ILGM

2. Green Crack Auto

green crack auto - colorado

Green Crack Auto is a sativa-dominant autoflower with a short lifecycle, so it suits growers who want a quick harvest.

The strain is known for its sharp citrus aroma and energetic effects. Its compact height suits small indoor spaces.

Green Crack Auto is a good fit for growers short on time or space.

CHECK PRICE AT HERBIES

3. Godfather OG Feminized

godfather og - colorado

Godfather OG is a strong indica-leaning strain popular with experienced adult consumers. Start low if you are new to it.

Its dense, resinous buds make it popular for hash. Godfather OG is considered relatively easy to grow indoors, though dense buds need good airflow to avoid mold.

CHECK PRICE AT ILGM

Conclusion

If you're planning to grow cannabis at home, start with a reliable seed source. For Colorado growers, popular options are online seed banks like ILGM and Herbies USA Express.

Colorado residents 21 and older can grow up to six plants each, with three flowering at once, in an enclosed, locked area that isn't openly visible. Check local limits, and remember that cannabis remains illegal under federal law.

Frequently Asked Questions

Where to buy cannabis seeds in Colorado?

Many Colorado growers buy online from seed banks like ILGM or Herbies USA Express, which ship within the U.S. and offer germination guarantees.

Colorado law lets residents 21 and older grow cannabis at home, and seed banks ship seeds there. Federally, seeds are a gray area, and a new hemp definition takes effect December 11, 2026.

Yes, for Colorado residents 21 and older, within plant limits and in an enclosed, locked area.

How many marijuana plants can you legally have in Colorado?

Up to six plants per resident over 21, with up to three flowering at one time. Local governments can set lower limits, such as Denver's 12-plant cap per home.

Can I grow marijuana outdoors in Colorado?

Generally no. The state health department says plants must be in an enclosed, locked area that can't be viewed openly, which means they can't be outside.

BUY SEEDS AT ILGM

CHECK PRICE AT HERBIES

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