C-99 Autoflower Seeds

C-99, also known as Cinderella 99, is a heavily sativa-dominant autoflower prized for its sweet tropical flavor and soaring cerebral effects. Originally developed by Brothers Grimm through an innovative cubing process in the late 1990s, C-99 has earned a devoted following among growers who value its compact size, fast turnaround, and potent daytime effects. This autoflower version brings all the character of the original into a seed-to-harvest format that suits impatient growers and limited spaces alike.

Genetics & Lineage

The lineage of C-99 traces back to a legendary breeding project by Brothers Grimm, led by breeder MrSoul. The foundation began with Princess, a standout Jack Herer phenotype that exhibited exceptional tropical fruit terpenes and uplifting effects. Princess was crossed with Shiva Skunk and then cubed over multiple generations to lock in the desired traits, concentrating the tropical flavors and energizing high with each successive generation. The result was a sativa-dominant hybrid with an unusually compact structure that defied expectations for a sativa-leaning variety. This autoflower version incorporates Ruderalis genetics for automatic flowering while maintaining the tropical terpene profile and energizing effects of the original photoperiod strain. At 85 percent sativa and 15 percent indica, C-99 is one of the most sativa-leaning autoflowers available on the market.

Appearance

C-99 auto produces light green buds with lively orange pistils and a dense, compact structure that belies its strong sativa dominance. The flowers are coated in heavy trichome coverage, giving them a frosty, almost crystalline appearance that hints at the resin production happening throughout the bud. Despite the strong sativa genetics, the buds tend to form tightly rather than growing airy or stretched, a trait inherited from the Shiva Skunk influence in the lineage. The compact bud structure combined with the sativa-driven trichome production makes C-99 auto a visually appealing strain that delivers substance to match its looks.

Aroma & Flavor

C-99 is a tropical fruit stand in cannabis form, and this is the trait that has made it famous among terpene enthusiasts. The aroma bursts with sweet pineapple, mango, and papaya, layered with citrus zest and a candy-like sweetness that makes it one of the most pleasant strains to open a jar of. Herbal spice notes round out the nose and add a layer of complexity that prevents the sweetness from becoming one-dimensional. The flavor delivers on every aromatic promise and then some, with sweet tropical fruit leading the way, followed by tangy citrus, a touch of pine and spice, and a floral sweetness that lingers on the exhale long after the hit has passed. This is a strain that appeals to growers who appreciate terpene-forward genetics and want flower that smells and tastes as good as it smokes.

Effects

C-99 is built for daytime use. The effects come on with a dreamy, euphoric lift that quickly sharpens into uplifting cerebral energy and mental clarity. Creativity flows freely, focus improves, and the overall mood is bright, optimistic, and engaged. There is very little body heaviness here, making C-99 an ideal choice for wake-and-bake sessions, creative projects, social outings, or any daytime activity where mental clarity and positive energy are valued over physical relaxation. THC levels typically range from 16 to 22 percent, providing solid potency without the overwhelming intensity of higher-THC strains. This approachable potency window makes C-99 a good entry point for those exploring sativa-dominant varieties for the first time, while still delivering enough effect to satisfy experienced consumers who appreciate a clean, functional high.

Growing Information

As an autoflower, C-99 runs from seed to harvest in approximately 10 to 12 weeks total, making it one of the faster turnaround options for growers who want quality flower without a long wait. Plants stay compact at 60 to 120 centimeters, fitting easily into small grow spaces, tents, closets, or balcony setups where height is a constraint. Indoor yields typically fall in the range of 400 to 500 grams per square meter, while outdoor plants may produce more modest yields of 50 to 200 grams per plant, as is typical for autoflower varieties compared to their photoperiod counterparts. C-99 auto is rated easy to moderate in grow difficulty and performs well in temperate to warm climates. The plants respond well to an 18/6 or 20/4 light schedule indoors. Light stress training can help maximize light exposure and improve yields, but heavy topping is generally not recommended for autoflowers due to their fixed vegetative timeline and limited recovery window. A light hand and consistent environment will bring out the best in this tropical classic.