Buy Cannabis Seeds Online in the USA, 1,300+ Premium Strains
Royal King Seeds is your trusted American source for premium cannabis seeds. Browse our complete collection of feminized, autoflowering, indica, sativa, hybrid, and CBD strains. We serve cultivators of all experience levels across the United States. Whether you are a first-time grower starting with easy autoflowers or an experienced cultivator chasing maximum potency, our catalog has the right genetics for your goals. Use our strain finder quiz to get personalized recommendations or explore our yield calculator to estimate your harvest.
Shop Shop All Cannabis Seeds
Browse 1,677 shop all cannabis seeds and filter by seed-to-harvest time, strain type, difficulty, THC, expected effects and flavor. Product specifications are breeder-reported unless otherwise noted and may vary by environment and growing method.
How to choose shop all cannabis seeds
Start with the factor that matters most for your setup: total growing time, available height, experience level, expected yield, cannabinoid profile or preferred flavor. Compare the complete strain specifications rather than choosing on THC percentage alone.
| Your priority | What to compare |
|---|---|
| A faster harvest | Seed-to-harvest time, not flowering time alone — they are different measurements |
| A small space | Expected height, stretch during bloom and recommended container size |
| A first grow | Difficulty rating, and how sensitive the cultivar is to feeding and training |
| A bigger yield | Indoor and outdoor yield ranges, and the environment the figure assumes |
| Potency | Breeder-reported THC and CBD |
| A particular experience | Cannabinoids, terpene profile and customer reports |
| Growing outdoors | Total lifecycle, climate suitability and your local season length |
Published THC, yield, height and finish times are estimates, not guarantees. Results vary with phenotype, environment, lighting, nutrition, container size and grower experience.
Shop All Cannabis seed guide
Why buy here
Royal King Seeds combines an extensive seed catalog with genuine customer care that sets us apart from other US-based seed banks. Our genetics are sourced from reputable breeders worldwide.
- American growers come back because we deliver consistent results, transparent strain information, and responsive support that helps you succeed from germination through harvest.
Types
Our catalog includes feminized cannabis seeds, autoflowering seeds (flowering on plant age, many finishing in approximately 8-11 weeks from seed), CBD-rich low-THC varieties, high-THC strains for experienced cultivators, and curated mix packs for those who want variety.
- Whether you are growing indoors in a small apartment in New York or outdoors in the California sun, we have genetics suited to your environment and goals.
- Use our yield calculator to estimate your harvest based on your specific setup.
How to choose
Consider your growing environment (indoor vs outdoor), experience level, desired effects, and your state climate. Beginners should start with autoflowering seeds, they flower automatically, stay compact, and finish in 8-10 weeks.
- Intermediate growers often prefer feminized photoperiod seeds for larger yields and more control.
- Advanced cultivators may explore exotic genetics, high-THC strains, or breeding projects.
- Our strain finder quiz helps you narrow down the best options in under 60 seconds.
Autoflower vs feminized
Autoflowering seeds are faster (8-10 weeks seed to harvest), stay smaller, and allow multiple harvests per year. Feminized photoperiod seeds produce larger plants, heavier individual harvests, and offer more control over plant size through vegetative growth timing.
- For beginners and limited spaces, autoflowers are ideal.
- For maximum single-harvest yield, feminized seeds win.
- Many experienced growers run both types simultaneously.
Growing tips
Start with quality genetics, strain selection is the single biggest factor in your results. Germinate seeds using the paper towel method or direct soil planting.
- Maintain proper temperature (70-85°F), humidity (40-60% during flower), and pH (6.0-6.5 in soil).
- Use quality lighting, LED or HPS for indoor grows.
- Feed conservatively and increase gradually.
- Train your plants with LST or topping for bigger yields.
- Check our complete grow guide library for detailed instructions on every stage from seed to harvest.
Need help choosing?
Answer a few quick questions and we'll recommend the best strains for your goals, experience, and growing setup.
Frequently asked questions
Is it legal to buy cannabis seeds in the USA?
Cannabis seed and cultivation rules vary by state and locality and may change, and laws can treat purchasing, possession, shipping, germination and cultivation differently. Confirm the current requirements for your state and locality before ordering or germinating seeds. This is general information, not legal advice.
How do I choose the right cannabis seeds?
Consider your growing environment (indoor vs outdoor), experience level, desired effects, and climate. Beginners should start with autoflowering or feminized seeds. Take our strain finder quiz for personalized recommendations based on your specific needs.
Do you offer a germination guarantee?
Royal King Seeds offers a 95% germination guarantee, subject to the eligibility and claim requirements of the current germination policy.
How is my order shipped?
Orders ship from within the United States. Free shipping is available on eligible orders of $150 or more. For current shipping details, see our Shipping page.
What is the difference between autoflower and feminized seeds?
Autoflowers flower based on age (8-10 weeks total), stay compact, and are beginner-friendly. Feminized photoperiod seeds require a light cycle change to flower, grow larger, and produce heavier individual harvests. Both types produce only female plants.
Where do orders ship from?
Orders ship from within the United States. Free shipping is available on eligible orders of $150 or more.
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