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From F1 Hybrids to Landrace strains, we stock only the most stable and potent phenotypes.
We stand by our seeds. If they don't pop, we replace them. Simple as that.
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Whether you are setting up a Screen of Green (SCROG) or a massive outdoor crop, we have the strain for you.
Photoperiod | 99.9% Female
Eliminate the guesswork. Our feminized cannabis seeds are bred to produce only female plants, ensuring every inch of your grow space is devoted to producing potent, resinous buds (Sinsemilla). Ideal for growers maximizing yield.
Ruderalis Hybrid | Fast Flowering
Integrating Cannabis ruderalis genetics, these plants flower automatically based on age, not light cycle. Perfect for perpetual harvests and discreet balcony grows. Go from seed to harvest in as little as 60 days.
Sterile | 3 Chromosome Sets
The future of commercial cultivation. Triploid genetics are naturally sterile, meaning they cannot be pollinated. This directs all plant energy into trichome and cannabinoid production, resulting in massive colas and higher ROI.
Male & Female | Breeding Stock
For the purists and breeders. Regular seeds produce both male and female plants, essential for creating your own F1 hybrids or preserving a mother plant. Experience the vigor of unaltered genetics.
At Colorado Seed Supply, we don't just sell seeds; we teach you how to master the art of the grow. Understanding the botany of Cannabis sativa L. is crucial for maximizing your harvest.
1. Germination: The process where the seed sprouts. Requires moisture, heat, and darkness. The taproot emerges, anchoring the plant.
2. Vegetative Stage: The plant focuses on structural growth (stems and fan leaves). Nitrogen is the key nutrient here. Light cycles usually run 18/6 (18 hours on, 6 off).
3. Flowering Stage: Triggered by a shift to 12/12 lighting (photoperiodism). The plant stops growing vertically and produces calyxes, pistils, and resin-filled trichomes.
| Element | Sign of Deficiency |
|---|---|
| Nitrogen (N) | Lower leaves turn yellow (chlorosis). |
| Phosphorus (P) | Slow growth, purple stems/leaves. |
| Potassium (K) | Brown, burnt edges on leaves. |
| Calcium (Ca) | Brown spots, weak stems. |
| Magnesium (Mg) | Yellowing between leaf veins. |
Looking for the biggest bang for your buck? These strains are renowned for their "g per watt" efficiency.
A Colorado classic. Resistance to powdery mildew makes it perfect for beginners. Expect yields up to 600g/m² indoors. Flavor profile is heavy on blueberry and sweet vanilla.
The legendary indoor strain. Short, bushy, and incredibly resinous. Low odor profile makes it great for stealth grows. Hits hard with a relaxing body high.
Known for gluing your scissors together during trim jail. Incredible THC levels often exceeding 28%. A heavy feeder that rewards you with dense, golf-ball sized nugs.
The coffee shop icon. Covered in white trichomes. High energy effect. Extremely resilient to temperature fluctuations.
Famous for its dessert-like aroma and purple hues. A lower yielder than Blue Dream, but the quality commands a premium price.
Curious about your harvest? Use our estimator based on average strain performance and lighting wattage.
| Feature | Regular Seeds | Feminized Seeds | Autoflower Seeds |
|---|---|---|---|
| Gender | 50% Male / 50% Female | 99.9% Female | 99.9% Female |
| Light Requirement | Photoperiod (12/12 to flower) | Photoperiod (12/12 to flower) | Any (18/6 recommended) |
| Difficulty | Advanced | Intermediate | Beginner |
| Cloning | Excellent | Good | Poor |
| Yield Potential | High | Very High | Medium |
Yes. Under the 2018 Farm Bill, cannabis seeds are classified as hemp products as long as they contain less than 0.3% THC (which seeds do). They are legal to possess as novelty items or souvenirs.
Store your seeds in a cool, dark, and dry place. A refrigerator is ideal. Keep them in their original packaging or an airtight container to maintain viability for years.
Morphologically, Sativas are tall with thin leaves, originating from equatorial regions. Indicas are short, bushy, with broad leaves, originating from the Hindu Kush mountains. Hybrids are a mix of both.
Currently, Colorado Seed Supply ships to all 50 US states. International shipping is coming soon.