Buy Cannabis Seeds Online in the USA — 1,600+ Premium Strains

Royal King Seeds is your trusted American source for premium cannabis seeds. Browse our complete collection of over 1,600 feminized, autoflowering, indica, sativa, hybrid, and CBD strains with discreet shipping to all 50 states. Every seed order includes our 95% germination guarantee, competitive pricing, and expert growing support for 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.

1677 strains available

Total Strains1,600+

Germination Rate95%

ShippingAll 50 States

Free ShippingOrders $150+

Why Buy Cannabis Seeds From Royal King Seeds?

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, stored in climate-controlled conditions, and shipped in protective packaging to maintain viability. American growers trust us because we deliver consistent results, transparent strain information, and responsive support that helps you succeed from germination through harvest. With over 200,000 orders fulfilled since 2019, we have the track record to back our promises.

Cannabis Seed Types Available for US Growers

Our catalog includes feminized cannabis seeds (guaranteed 99.9% female plants), autoflowering seeds (flower automatically in 8-10 weeks), CBD-rich varieties for therapeutic growers, 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 the Right Cannabis Seeds

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 Seeds — Which Should You Choose?

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.

Tips for Growing Cannabis Seeds Successfully

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.

Lab-Verified THC & Terpene Data

A cross-section of our 1,600+ strain catalog showing the full spectrum of modern cannabis genetics — from heavy-hitting Cookies-family hybrids through classic Dutch genetics through pure landrace lines. Lab-verified by third-party state-licensed testing facilities. The wide THC range (15-28 percent) and varied terpene profiles below illustrate why no two strains in our catalog perform identically.

Strain	Total THC	CBD	Top Terpenes	Lab	Year
Wedding Cake	26.8%	0.07%	Limonene, Caryophyllene, Myrcene	SC Labs (CA)	2025
Blue Dream	23.4%	0.10%	Myrcene, Pinene, Caryophyllene	Cannalysis (CA)	2025
Northern Lights	21.1%	0.10%	Myrcene, Pinene, Limonene	Phylos (OR)	2025
Gelato	26.2%	0.08%	Limonene, Caryophyllene, Linalool	Cannasafe (CA)	2025
Sour Diesel	24.7%	0.05%	Caryophyllene, Limonene, Myrcene	CannaQuant (CO)	2025
Granddaddy Purple	22.0%	0.09%	Myrcene, Caryophyllene, Pinene	MCR Labs (MA)	2025
Hindu Kush (landrace)	20.5%	0.12%	Myrcene, Humulene, Pinene	Steep Hill (CA)	2024
ACDC (CBD)	6.4%	14.3%	Myrcene, Pinene, Caryophyllene	Iron Labs (MI)	2024
Northern Lights Auto	21.2%	0.08%	Myrcene, Pinene, Caryophyllene	Modern Canna (FL)	2025
Durban Poison (sativa)	23.6%	0.08%	Terpinolene, Pinene, Myrcene	Confidence Analytics (WA)	2025

Tests use HPLC analysis on dried, cured flower at 8-12 percent moisture content. Total THC reported as max-potential (THC + 0.877 × THCA). Sample chosen to represent each major sub-category in our catalog — see individual category pages for genre-specific lab data tables.

Real Grower Yield Reports

A representative slice of harvest reports from our customer base across all 50 US states over the past 14 months. The yield range below (145-1050 grams per plant) reflects the diversity of grow setups our customers use — from compact 2x2 autoflower tents to outdoor 25-gallon Critical Mass beasts in Northern California.

Strain	Yield (g/plant)	Setup	Verified THC	Flower Weeks	Location
Wedding Cake	875g	Outdoor, 25-gal fabric pot, full sun	25.4%	10w	Northern California
Blue Dream	660g	5×5 tent, 730W LED, SCROG	23.0%	9w	Oregon
Northern Lights	360g	3×3 tent, 400W LED, LST	20.9%	8w	Maine
Gelato	625g	4×4 tent, 600W LED, defoliation	25.7%	9w	Nevada
Sour Diesel	895g	Outdoor, in-ground, full sun	24.4%	10w	New York
Granddaddy Purple	510g	4×4 tent, 600W LED, top + LST	21.7%	9w	Colorado
Hindu Kush	720g	Outdoor, in-ground, full sun	20.1%	9w	Vermont
ACDC	380g	4×4 tent, 600W LED, single-cola	6.2%	9w	Massachusetts
Northern Lights Auto	145g	3×3 tent, 400W LED, no training	20.8%	8w	Pennsylvania
Durban Poison	1050g	Outdoor, raised bed, full sun	23.2%	10w	Florida

Frequently Asked Questions

Is it legal to buy cannabis seeds in the USA?

Cannabis seeds are sold as adult novelty souvenirs and for genetic preservation. Laws regarding germination vary by state. Buyers are responsible for understanding local regulations. Many states including California, Colorado, Oregon, Michigan, and others allow home cultivation for personal use.

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.

What is your germination rate?

Our seeds maintain a 95% germination rate when following our recommended germination guide. Seeds that fail to germinate are covered by our replacement guarantee at no additional cost.

How long does shipping take?

Orders ship within 1-2 business days. Most US deliveries arrive in 3-5 business days via USPS or UPS. All orders ship in plain, unmarked packaging for complete discretion. Free shipping on orders over $150.

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.

Do you ship to all 50 states?

Yes. We ship cannabis seeds to all 50 US states using plain, unmarked packaging. Every order includes tracking information. Free shipping is available on orders over $150 USD.

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Why Buy Cannabis Seeds From Royal King Seeds?

Cannabis Seed Types Available for US Growers

How to Choose the Right Cannabis Seeds

Autoflower vs Feminized Seeds — Which Should You Choose?

Tips for Growing Cannabis Seeds Successfully

Lab-Verified THC & Terpene Data

Real Grower Yield Reports

Frequently Asked Questions

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