How to Grow Cinderella 99 Auto
Cinderella 99 Auto, often shortened to C99 Auto, is a fruity, energetic sativa in autoflower form. It crosses a Jack Herer and Cinderella 99 hybrid with Magnum Auto, giving an 80% sativa plant that flowers automatically and packs a potent 24-26% THC, high for an autoflower. At a tall 4.92 ft with a sweet, tropical flavor, the Cinderella 99 Auto strain is built for growers who want a bright, uplifting daytime high and a big indoor harvest without a light schedule to manage.
This guide covers the full cycle for Cinderella 99 Auto feminized seeds from Blimburn Seeds, from germination to the cure, with every figure taken from the official datasheet.
Recommended Strains
Cinderella 99 Auto
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THC | 24% - 26% (High) |
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Type | Autoflowering |
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Yield | High |
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Phenotype | 20% Indica / 80% Sativa |
Cinderella 99
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THC | 13% - 17% (Medium) |
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Type | Feminized |
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Yield | High |
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Phenotype | 20% Indica / 80% Sativa |
Cinderella 99 Auto at a Glance
The official numbers first:
| Trait | Cinderella 99 Auto |
|---|---|
| Lineage | (Jack Herer x Cinderella 99) x Magnum Auto |
| Type | Autoflowering feminized |
| Phenotype | 20% Indica / 80% Sativa |
| THC | 24-26% (high) |
| Life cycle | 10-12 weeks (seed to harvest) |
| Height | 4.92 ft (1.5 m) |
| Yield indoor | 1.64-1.97 oz/ft² (500-600 g/m²) |
| Yield outdoor | 5.29-7.05 oz (150-200 g) per plant |
| Harvest | All season |
| Climate | Dry |
| Effects | Energetic, euphoric, creative |
| Flavors | Fruity, sweet, tropical |
Two figures define this plant. The 24-26% THC is genuinely high for an autoflower, and the indoor yield of up to 1.97 oz/ft² is excellent. The outdoor figure is more modest per plant, so the Cinderella 99 Auto strain is at its best indoors or grown as several plants rather than relying on one big outdoor specimen.
Promos & Deals
The Jack Herer and Cinderella 99 Parents of Cinderella 99 Auto
The backbone is a cross of two sativa legends. Jack Herer, the multiple Cup-winning haze, brings the energetic, clear-headed, creative lift and the spicy-fresh complexity, while Cinderella 99 adds the famous sweet, fruity, almost tropical flavor and a fast, resinous flowering habit.
Magnum Auto completes the recipe. A big-yielding autoflower, it introduces the ruderalis that makes the plant flower by age rather than light schedule, and it lends the vigor behind the strong indoor yield. The result keeps the C99 character but runs on a fixed 10-12 week clock.
These genetics place Cinderella 99 Auto among the most potent of Blimburn’s autoflowering seeds and its energetic sativa seeds, with the Jack Herer influence running through the whole profile.
Germinating and Growing Cinderella 99 Auto
Germinate with the paper-towel method at 70-79°F, then handle the seedling as little as possible. Autoflowers run on a fixed internal clock and do not recover from transplant shock the way photoperiod plants do, so plant each seed straight into its final 3-5 gallon container, taproot down and half an inch deep.
Run 18-20 hours of light a day from the moment it sprouts, and keep that schedule for the entire life cycle; there is no vegetative-to-flower switch to make. Growth is quick and distinctly sativa, and because the plant reaches 4.92 ft and stretches, give it a roomy pot and plenty of vertical space from the start.
Keep training gentle. Low-stress training, tying the tall branches down early, works well to control the stretch and even the canopy, but skip topping and heavy defoliation, since the auto life cycle leaves no time to recover from hard stress.
Growing Cinderella 99 Auto Indoors
Indoors is where this strain delivers. The routine is simple: an 18/6 or 20/4 light schedule held steady from sprout to harvest. Cinderella 99 Auto starts flowering on its own around weeks four to five and finishes the full run in 10-12 weeks, a little longer than most autos because of its sativa dominance.
Hold temperatures at 68-80°F and keep humidity low, around 50-55% early and 40-45% in flower, in line with the strain’s dry-climate preference. The plant stretches, so low-stress training and good vertical room matter. Reward the effort with a high indoor yield of 1.64-1.97 oz/ft² (500-600 g/m²).
Growing Cinderella 99 Auto Outdoors
Outdoors, Cinderella 99 Auto strongly prefers a dry climate, which suits the arid and semi-arid United States, places like Arizona, New Mexico, inland Southern California, and the high desert of Colorado, where low humidity keeps the sativa buds clean. As an autoflower it is all-season, so you can start a run almost any warm time of year.
Be realistic about outdoor yield, though: at 5.29-7.05 oz (150-200 g) per plant it is modest, so grow several plants rather than banking on one. The compact, fast cycle is an advantage on a balcony or patio, and the low-humidity preference means this is one to keep out of damp, muggy outdoor settings.
Flowering and Buds of Cinderella 99 Auto
Flowering begins automatically, usually around week four to five from germination. Over the back half of the 10-12 week cycle, Cinderella 99 Auto forms the long, spear-shaped colas of a sativa, filling in with dense, resin-frosted flower rather than bulking into tight indica knots. The sweet, fruity, tropical aroma builds steadily and is unmistakable by the finish.
Resin coverage is heavy, especially given the high 24-26% THC, frosting the slim sativa calyxes and sugar leaves alike. Keep humidity low and airflow steady; even on an airy sativa, the dry conditions this strain prefers bring out the cleanest, most flavorful flower.
Common Problems and Pro Tips
The golden rule with any autoflower applies here: do not stress the plant. With a fixed 10-12 week life cycle, there is no time to recover from a rough transplant, heavy topping, or a nutrient overdose. Plant in the final pot, train only gently, and keep the environment stable.
The two things to plan around are the stretch and the dry-climate preference. Expert tip: start low-stress training early to tame the sativa height indoors, and lean into this plant’s strengths by growing it inside or in a dry outdoor spot. The modest outdoor yield means indoor growers get far more out of its high-THC, high-yield potential.
Feeding and Watering
Autoflowers feed lightly, and Cinderella 99 Auto is no exception. Keep nutrient strength below photoperiod levels and build up slowly; overfeeding is the most common mistake on a plant this fast.
| Stage | EC | pH | Notes |
|---|---|---|---|
| Seedling | 0.4-0.6 | 6.0-6.5 | Plain water or quarter-strength feed |
| Early growth | 0.6-1.0 | 6.0-6.5 | Light nitrogen, add silica for stems |
| Early flower | 1.0-1.2 | 6.0-6.5 | Ease into bloom nutrients as pistils show |
| Peak bloom | 1.2-1.4 | 6.0-6.5 | Phosphorus and potassium, kept moderate |
| Flush | 0.0-0.4 | 6.0-6.5 | Final 7-10 days, plain water |
Water when the top inch of the medium dries, and err on the drier side given the strain’s arid preference. Let the pot lighten clearly between rounds, and watch for signs of overfeeding rather than hunger on such a light-feeding plant.
Finish with 7-10 days of plain water at EC 0.0-0.4. The sweet, fruity, tropical profile is delicate, and a clean flush keeps it bright on the exhale.
Flavor, Terpenes, and Effects of Cinderella 99 Auto
The flavor is sweet, fruity, and tropical, the signature C99 profile that made the original famous. Six terpenes shape it. Terpinolene leads with the fresh, fruity brightness C99 is known for, alpha-phellandrene and delta-3-carene add a sweet, zesty, almost citrusy lift, and pinene threads a crisp freshness through the top. Terpineol rounds the finish with a soft floral sweetness, while nerolidol fills in a gentle, woody depth beneath.
The effect is pure energetic sativa. It opens euphoric, creative, and genuinely stimulating, well suited to daytime, work, or anything social, with the clear-headed drive both Jack Herer and C99 are loved for. At a potent 24-26% THC it is strong, so newer users should go slow, even though the easy autoflower grow still earns it a beginner-suitable rating.
Harvesting, Drying, and Curing
Check trichomes from around week eight, since a sativa like this often wants the full cycle. Harvest when most are cloudy with just a little amber to preserve the bright, energetic character; too much amber dulls the uplifting edge. Expect a staggered ripening down the long colas, so take the tops first.
Dry whole branches at 59-68°F and 50-55% humidity for 7-14 days in darkness with gentle airflow, waiting for stems that snap. The airy sativa flowers dry quickly, so check early to avoid over-drying. Cure in glass for at least three weeks, burping daily early on; the sweet, tropical profile sharpens and cleans up with a patient cure.
What to Do With Your Trim
The high-THC resin makes the trim worth keeping. Dry-sift the sugar leaves for a sweet, fruity kief, run ice-water bags for hash, or press the sift into rosin to capture the tropical C99 terpene profile at full strength. Little needs to reach the compost.
Frequently Asked Questions
Is Cinderella 99 Auto an autoflower?
Yes. Cinderella 99 Auto is an autoflowering strain, thanks to the Magnum Auto in its lineage. It flowers automatically by age rather than light schedule and runs its full cycle in 10-12 weeks from seed, with no 12/12 flip needed, unlike photoperiod Cinderella 99 crosses.
What is the THC level of the Cinderella 99 Auto strain?
The official range is 24-26%, a high level for the Cinderella 99 Auto strain and especially strong for an autoflower. The effect is genuinely potent, so newer users should start with a small amount, though the easy grow still earns it a beginner-suitable rating.
How much does Cinderella 99 Auto yield?
Indoors the Cinderella 99 Auto strain yields a high 1.64-1.97 oz/ft² (500-600 g/m²). Outdoors it is more modest at 5.29-7.05 oz (150-200 g) per plant, so growers often run several plants or focus on indoor cultivation to get the most from it.
How long does Cinderella 99 Auto take from seed to harvest?
Cinderella 99 Auto finishes in 10-12 weeks from germination, a little longer than most autos because of its 80% sativa dominance. It flowers on its own around weeks four to five, and as an all-season autoflower it can be started almost any warm time of year.
Is Cinderella 99 Auto indica or sativa?
Cinderella 99 Auto is strongly sativa, at 80% sativa to 20% indica. The effect is energetic, euphoric, and creative, a clear-headed daytime high true to its Jack Herer and Cinderella 99 parentage, and the plant grows tall and stretchy to match.
What does the Cinderella 99 Auto strain taste like?
Cinderella 99 Auto tastes sweet, fruity, and tropical, the classic C99 profile. Terpinolene drives the bright fruity top note, phellandrene and delta-3-carene add a zesty lift, and terpineol lends a soft floral sweetness. The flavor is delicate and sharpens with a full cure.
