Cinderella 99

Cinderella 99 (C99): The Commercial Sativa Benchmark

Cinderella 99 — universally known as C99 — occupies a unique position in cannabis genetics: it delivers the soaring cerebral euphoria of a top-shelf sativa in a compact, fast-finishing, commercially viable package. Created by Mr. Soul of Brothers Grimm Seeds through a meticulous backcross programme in the late 1990s, C99 became one of the most sought-after indoor strains of its era and remains a reference point for sativa breeders worldwide.

Genetics & Brothers Grimm Origins

The C99 story begins with Mr. Soul, the breeder behind Brothers Grimm Seeds, discovering a single seed in a package of Sensi Seeds Jack Herer he received in the mid-1990s. That seed — which he named “Princess” after its exceptional quality — became the foundation for a deliberate backcross programme designed to stabilise its outstanding sativa traits in a form compatible with commercial indoor cultivation.

Mr. Soul crossed Princess with Shiva Skunk, then backcrossed the resulting offspring to Princess three times (a process known as cubing). The triple backcross locked in the sativa-dominant genetics, tropical aroma, and fast finishing time while eliminating the height and season-length issues that plague most pure sativas. The result was Cinderella 99 — named for the fairy tale character’s transformation from ordinary to extraordinary.

Brothers Grimm released C99 commercially in the late 1990s and it immediately became one of the most acclaimed strains of the era, winning multiple awards and establishing Brothers Grimm as one of the premier seed banks of the period. When Mr. Soul closed Brothers Grimm Seeds in 2002, C99 survived primarily as a clone-only variety passed between dedicated growers. Various seed banks produced crosses and tributes in the years following, but authentic Brothers Grimm C99 in seed form remained unavailable for over a decade.

Mr. Soul re-launched Brothers Grimm Seeds around 2016–2017, making C99 available in seed form again and restoring the original genetics to the broader market. The relaunch was met with significant enthusiasm from the growing community, many of whom had only experienced C99 through secondhand clones or tribute crosses during the years of absence.

Terpene Profile

C99’s tropical fruit aroma — dominated by pineapple and citrus with sweet mango undertones — is driven by a terpinolene-forward profile with supporting contributions from myrcene and caryophyllene. This combination produces both the characteristic scent and C99’s clear-headed, anxiolytic-adjacent effect profile.

The terpinolene-myrcene combination in C99 is particularly effective at producing uplifting euphoria without anxiety — a critical distinction from high-caryophyllene strains that can amplify introspection. The relatively lower caryophyllene presence keeps the mental effects light and social rather than heavy or contemplative, contributing to C99’s reputation as an anxiety-friendly sativa.

Effects: What to Expect from C99

Cinderella 99 is defined by its ability to deliver potent sativa cerebral effects without the anxiety, paranoia, or racing thoughts that can accompany high-THC pure sativas. The indica backbone from the Shiva Skunk cross provides just enough grounding to keep the experience clean and manageable.

Onset (0–15 Minutes)

C99’s onset is noticeable within the first five minutes: a warm, optimistic mood lift accompanied by heightened sensory awareness and an immediate sense of mental clarity. Unlike some sativas that produce a jarring cerebral rush, C99’s onset is described as smooth and welcoming, with euphoria building steadily rather than arriving all at once.

Peak (15–90 Minutes)

The peak is characterised by elevated mood, genuine creative energy, sharp conversational focus, and heightened appreciation of sensory input — particularly music and visual environments. Many users report a sustained ability to engage with tasks, social interactions, and creative work without the distracted, tangential thinking that can accompany more stimulating sativas. This makes C99 particularly valued by people who need to remain functional and productive while using cannabis.

Tail (90–180 Minutes)

The comedown from C99 is notably gentle: effects taper into a warm, grounded contentment without heavy sedation or significant body load. Mild appetite stimulation often appears in the tail phase. The clean finish is one of C99’s most appreciated traits — users can transition to other activities without experiencing the cognitive fog or inertia common in more indica-influenced strains.

Medical Uses

C99’s clean, uplifting profile without significant sedation or body load makes it well-suited to a range of conditions where daytime functionality is a priority.

• Depression: The consistent euphoric lift and motivational boost make C99 one of the most cited sativas for depression management. The absence of heavy anxiety side-effects widens its applicability compared to more stimulating sativa varieties.
• Anxiety: Unlike many high-THC strains, C99’s terpinolene-forward profile and indica grounding reduce the risk of anxiety amplification at moderate doses. It is regularly cited by anxious cannabis users as one of the few potent strains that remains manageable.
• Fatigue: The energy and mental clarity produced by C99 make it a functional daytime tool for those dealing with fatigue, whether from medical conditions, sleep issues, or demanding schedules.
• Stress: The mood-elevating, perspective-shifting effect of C99 provides effective relief from acute stress without impairing cognitive function.
• Mild Pain: Caryophyllene’s CB2 receptor activity provides some analgesic contribution; C99 is not a primary pain strain but offers mild relief alongside its primary mood effects.

Consult a licensed healthcare provider before using cannabis for medical conditions. Cannabis affects individuals differently based on dose, tolerance, and health status.

C99 vs. Similar Sativa-Dominant Strains

Growing Cinderella 99

C99 is exceptional among sativa-dominant strains for its grow-room compatibility. Its indica-influenced structure — inherited from the Shiva Skunk cross — keeps height manageable, and the 7–8 week flower time makes it one of the most efficient indoor sativas in terms of grams-per-day-of-flower. These qualities made C99 a commercial production favourite through the 2000s and the appeal has not diminished.

Indoors, C99 performs best under high-intensity lighting with good air circulation around the canopy. Low-stress training (LST) during early veg distributes growth across the canopy and prevents the main cola from dominating at the expense of side branches. The fast 7–8 week cycle means growers can complete additional harvests per year compared to longer-finishing sativas — a key factor in C99’s commercial appeal.

Buds are typically dense and resin-coated with a brilliant pineapple-citrus aroma that becomes pronounced from week 5 onward. Carbon filtration is strongly recommended — C99 in full flower is highly aromatic. Phosphorus and potassium levels should be elevated from week 3 of flower to support trichome and bud development; flush for the final 7–10 days to preserve the tropical terpene profile at harvest.

Clones root readily, and C99 mothers are productive — another reason the strain became a commercial favourite. Seed-grown plants can show some phenotypic variation; selecting for the most tropical-aromas plant in a run and using it as a mother is a common approach among dedicated C99 growers.

The Brothers Grimm Legacy

Brothers Grimm Seeds — and C99 in particular — represent a pivotal moment in cannabis seed bank history. In the late 1990s, most seed banks were Dutch or UK-based, and the American market was dominated by Dutch varieties. Brothers Grimm, operating from the US, brought a distinctly American perspective to professional cannabis breeding: rigorous backcross methodology, precise selection criteria, and a commitment to genetic stability that was ahead of its time.

Mr. Soul’s breeding notes and documentation of the C99 development process — published on cannabis forums in the late 1990s and early 2000s — remain some of the most detailed and scientifically coherent breeding records from the era. They influenced a generation of American breeders who came after him, including many who now operate major seed companies.

The C99 story also illustrates a broader pattern in cannabis genetics: great strains go underground, survive as clones passed between dedicated growers, and eventually find their way back to the market through the perseverance of those who valued them. The 14-year gap between Brothers Grimm’s closure and Mr. Soul’s return only increased C99’s legendary status among connoisseurs.

Drug Test Detection Windows

See our full drug testing guide for detail on how testing works, metabolite half-lives, and THC clearance factors.

Buying Cinderella 99: What to Look For

When purchasing C99 from a legal dispensary, quality indicators include:

• Terpene profile: Look for terpinolene as the leading terpene — this is the clearest marker of authentic C99 genetics. Batches with caryophyllene or myrcene leading may be crosses rather than true C99.
• Aroma: Immediate tropical pineapple-citrus on opening — bright, sweet, and clean. Flat, earthy, or diesel-forward aromas indicate different genetics.
• THC range: 20-23%. Material above 25% labelled as C99 is likely a cross. Verify via COA.
• Flower time for growers: If sourcing clones for cultivation, ask for the established cycle time. Authentic C99 finishes in 7-8 weeks; longer cycles indicate different genetics.
• Source: Brothers Grimm Seeds is the original and most authoritative source of genuine C99 genetics in seed form. Look for Brothers Grimm branding or licensed genetics when purchasing seeds.

C99 is available across most legal US cannabis markets and in Canadian dispensaries. Its commercial popularity means availability is generally consistent, though premium Brothers Grimm-lineage batches may be intermittent. Colorado, California, and Washington typically have the best consistent supply of quality-tested C99.

Frequently Asked Questions