Brothers Grimm Seeds: The Legacy of Cinderella 99 and Mr. Soul

Brothers Grimm Seeds is one of the most iconic cannabis seed companies to ever emerge from the American cannabis underground. Founded in the late 1990s by Mr. Soul and his partner Sly, this Colorado-based collective became legendary almost overnight — not just for the quality of their genetics, but for the culture they helped define during one of the most creative periods in cannabis history.

In an era before legal dispensaries, Instagram genetics, and viral strain drops, Brothers Grimm was quietly revolutionizing what cannabis could be. Their most famous creation, Cinderella 99, remains one of the most sought-after sativa-dominant strains ever bred. Nearly three decades on, the story of Brothers Grimm Seeds is a story about passion, precision, and an almost obsessive love for exceptional cannabis.

History of Brothers Grimm Seeds

Brothers Grimm Seeds was born in the late 1990s when a Colorado grower who went by the name Mr. Soul began sharing his exceptional cannabis genetics on online forums. This was the early internet era — a time when cannabis enthusiasts gathered on text-heavy communities like Overgrow.com to swap grow reports, debate genetics, and share knowledge across borders. Mr. Soul partnered with a fellow grower named Sly, and together they launched Brothers Grimm Seeds.

Operating semi-anonymously out of necessity, they released a small but extraordinary catalog of seeds that quickly became the talk of the online cannabis world. Their approach was meticulous: they weren’t just crossing whatever was available — they were hunting phenotypes, stabilizing genetics through patient multi-generation selection, and choosing for specific qualities that made their strains stand apart from everything else available at the time.

The original operation ran until approximately 2002, when the pair dissolved the company. For several years, Brothers Grimm genetics survived only through cuts held by dedicated collectors, seeds stashed by long-time growers, and deeply reverent forum threads. Then in 2016, Mr. Soul relaunched Brothers Grimm Seeds — bringing updated versions of the classic catalog to a new generation of growers who had grown up hearing about these legendary strains.

The revival was met with enormous enthusiasm. Decades of reverence had only amplified the legend, and growers who had spent years reading about Cinderella 99 finally had a chance to work with authentic genetics from the original breeder.

Iconic Strains From Brothers Grimm

Cinderella 99 (C99)

No strain is more synonymous with Brothers Grimm than Cinderella 99. The origin story is a piece of cannabis folklore: Mr. Soul reportedly found a seed inside a bag of Jack Herer purchased from an Amsterdam coffee shop. He germinated that seed, discovered a remarkable female he called “Princess,” and then embarked on a multi-generation backcross breeding project to stabilize and amplify her best traits.

The result was Cinderella 99 — a fast-finishing, sativa-dominant hybrid with soaring, euphoric effects, a complex pineapple-citrus aroma, and dense, resin-coated buds that defied its predominantly sativa genetics. C99 typically finishes in 7–8 weeks indoors, which was virtually unheard of for a sativa-leaning strain at the time. That combination of quality, speed, and terpene complexity made C99 an instant legend.

C99 delivers a genuinely exceptional high: clear-headed, energetic, and creative, without the racing anxiety that can accompany pure sativas. The terpene profile — tropical fruit, sweet pineapple, hints of sandalwood — is as memorable as the effects. Cinderella 99 has since been used as a parent in hundreds of modern crosses, contributing genetics to strains found in dispensaries all over the world.

Apollo 11

Apollo 11 is another Brothers Grimm masterpiece, born from crossing Genius with Cinderella 99. Like C99, Apollo 11 leans sativa but finishes quickly — typically around 8 weeks from flip. The high is clear, functional, and uplifting, with a pronounced grapefruit and lemon citrus aroma. Apollo 11 earned its name from the sense of mental liftoff it delivers; growers seeking a daytime strain that inspires creativity and focus without sedation have long ranked Apollo 11 among their top choices.

The “Genius” phenotype of Apollo 11 became especially prized within the collector community — a selection with extreme trichome density and an intensely potent cognitive effect that became one of the most discussed cannabis selections of the early 2000s online era.

Genius

Genius was Brothers Grimm’s attempt to breed a strain optimized for cerebral potency and creative thinking. The result was a highly resinous, fast-finishing hybrid that combined elements of C99 with carefully selected complementary genetics. Genius plants tend to be compact with impressive trichome production, and the high is intensely mental — focused and creative rather than heavy or sedating.

Princess and Other Notable Releases

Beyond the Big Three, Brothers Grimm has offered preserved Princess genetics (the original C99 mother line), Rosebud, Killer Queen, and other carefully developed crosses. Each release reflects the same core philosophy: start with exceptional parents, select rigorously across multiple generations, and never release a strain until it consistently meets the standard.

Breeding Philosophy and Techniques

What has always set Brothers Grimm apart is not just what they breed, but how they breed. Mr. Soul documented his processes extensively on cannabis forums in the late 1990s and early 2000s — sharing not just seeds but the detailed reasoning and methodology behind each breeding project. His transparency helped educate an entire generation of home breeders and genetics enthusiasts.

His approach to creating Cinderella 99 is a textbook example of patient backcross selection. After identifying the exceptional Princess phenotype, Mr. Soul backcrossed her across multiple generations — selecting the most Princess-like offspring each time, then repeating the process to stabilize her dominant traits while maintaining enough genetic diversity for healthy, vigorous plants. This methodical process produced a line that consistently expresses its best traits across multiple grows and different growing environments.

Mr. Soul also places enormous emphasis on phenotype hunting — growing out large numbers of plants from each cross and selecting only the most exceptional individuals for the breeding program. This patience and selectivity are what keep Brothers Grimm genetics at a level above breeders who rush new releases to market every few months.

Post-revival, Brothers Grimm has maintained these same high standards while incorporating modern breeding knowledge. The commitment to quality that defined the original catalog remains the foundation of everything they produce.

Brothers Grimm’s Impact on Modern Cannabis

It is nearly impossible to overstate the influence Brothers Grimm Seeds has had on the broader cannabis genetics landscape. Cinderella 99 alone has been used as a parent in an enormous number of popular contemporary strains. Its fast-finishing growth profile, combined with a tropical terpene expression and manageable sativa structure, made it an ideal breeding parent for creating uplifting hybrids that don’t require extended flowering periods.

Beyond genetic contribution, Brothers Grimm helped establish a culture of precision and transparency in cannabis breeding. Mr. Soul’s forum posts from the late 1990s remain required reading for anyone serious about cannabis genetics methodology. He wrote openly about phenotype selection, backcrossing, and S1 feminization at a time when most serious breeders kept such knowledge closely guarded.

The Brothers Grimm story also helped establish the modern collector’s market for elite cannabis genetics. When Mr. Soul relaunched the brand in 2016, it demonstrated that exceptional genetics could retain their value and cultural significance across decades — a principle that has become even more relevant in today’s competitive genetics marketplace. In an era when new strains are announced almost daily, Brothers Grimm represents a different kind of value: proven, time-tested genetics with documented history and a breeder who has earned community trust over nearly thirty years.

Where To Find Brothers Grimm Genetics Today

Following the 2016 revival, Brothers Grimm Seeds are once again available through reputable seed banks worldwide.

When shopping for Brothers Grimm seeds, purchase only from authorized, verified retailers. Due to the brand’s legendary status, counterfeit and misrepresented genetics do circulate in the market. Established seed banks with verified stock are the only safe option.

For growers interested in sativa-dominant genetics that finish quickly, deliver exceptional cerebral highs, and produce memorable terpene profiles, Brothers Grimm Seeds remains an essential source. Cinderella 99 is a strain every serious grower should experience at least once — not just as a great plant, but as a piece of living cannabis history.

Frequently Asked Questions: Brothers Grimm Seeds

Who founded Brothers Grimm Seeds?

Brothers Grimm Seeds was founded in the late 1990s by Colorado-based growers Mr. Soul and Sly. Mr. Soul is the primary breeder and creator of Cinderella 99.

What is Cinderella 99?

Cinderella 99 is a sativa-dominant hybrid bred by Mr. Soul through patient backcross selection from a Jack Herer descendant. It is known for its fast 7–8 week finish, pineapple-citrus aroma, and uplifting, euphoric effects.

Are Brothers Grimm Seeds still available?

Yes. After a hiatus following the original company’s dissolution around 2002, Mr. Soul relaunched Brothers Grimm Seeds in 2016. Authentic genetics are available through verified retailers.

How long does Cinderella 99 take to flower?

C99 typically finishes in 7–8 weeks indoors — exceptionally fast for a sativa-dominant strain.

What other strains did Brothers Grimm create?

Notable Brothers Grimm strains beyond C99 include Apollo 11, Genius, Princess, Rosebud, and Killer Queen.