How to Grow Cindy 99
Few strain names carry as much nineties nostalgia as Cindy 99, the nickname growers gave Cinderella 99 back when it was the fastest sativa anyone had seen. This version honors the original recipe: Princess crossed with Cinderella 88, the very pairing that created the C99 legend in the first place. The feminized seeds are listed as Cindy 99 at Blimburn Seeds.
On paper it reads like a classic sativa with the rough edges sanded off: 70% sativa genetics, 20-22% THC in the medium band, and a flowering window of just 8-10 weeks where old-school sativas demanded four months. The effect follows the cindy 99 strain reputation faithfully, opening happy and talkative and settling into an easy relaxed finish that never turns heavy.
Recommended Strains
Cindy 99
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THC | 20% - 22% (Medium) |
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Type | Feminized |
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Yield | High |
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Phenotype | 30% Indica / 70% Sativa |
Cindy 99 Regular
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THC | 20% - 22% (Medium) |
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Type | Regular |
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Yield | High |
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Phenotype | 30% Indica / 70% Sativa |
The one number that should shape your whole plan sits in the height row: up to 9.84 ft outdoors. This plant is a tree in waiting, and this guide treats height management as seriously as feeding. Read the training sections twice if you grow in a tent.
Cindy 99 at a Glance
The datasheet tells you most of what you need to decide where and how to run it.
| Type | Feminized (photoperiod) |
| Lineage | Princess x Cinderella 88 |
| Phenotype | 30% Indica / 70% Sativa |
| THC | 20% – 22% (medium) |
| Climate | Tropical to warm |
| Height | Up to 9.84 ft (3 m) |
| Flowering time | 8 – 10 weeks after the flip |
| Harvest month | October |
| Yield indoor | 1.47 – 1.8 oz/ft² (450 – 550 g/m²) |
| Yield outdoor | 21.16 – 24.69 oz/plant (600 – 700 g/plant) |
| Effects | Happy, relaxed, talkative |
| Flavors | Fruity, sweet |
Those outdoor numbers are the payoff for the height: give this plant room to become itself and it returns up to 700 grams of fruity, sweet flower. Indoors, the same genetics tamed by training still fill a canopy with 450-550 g/m², a generous return for a sativa this fast.
Promos & Deals
Getting Cindy 99 Started
Germinate at 70-79°F; the vigor shows immediately, with seedlings that outpace most of the catalog in their first two weeks. Start in small pots and transplant up as roots fill each container. Indoors, cap the final pot at 3-5 gallons to help restrain size; outdoors, go as big as your space allows, because root room translates directly into those 700 gram harvests.
Veg under 18 hours of light with daytime temperatures of 68-82°F; as a tropical-climate cultivar it shrugs off heat that troubles other strains, and it genuinely prefers the warm end of the range. Keep humidity at 50-60% during veg. Here is the counterintuitive part: indoors, veg this plant SHORT. Two to three weeks is plenty, because the post-flip stretch does the rest of the growing for you.
Feeding Cindy 99 by EC
Sativas of this era were bred in soil and sun, and Cindy 99 keeps a moderate, steady feeding style rather than the brute hunger of modern production hybrids. Measure with an EC meter and hold pH at 6.0-6.5 in soil.
| Stage | Weeks | EC | Notes |
|---|---|---|---|
| Seedling | 1-2 | 0.4 – 0.6 | Plain water or very light feed |
| Vegetative | 2-3 | 0.8 – 1.2 | Nitrogen-leaning base nutrients |
| Preflower | Flip + 1-2 | 1.2 – 1.4 | Transition feed through the long stretch |
| Bloom | Flip + 3-8 | 1.4 – 1.6 | Bloom base, add PK booster |
| Flush | Final 1-2 | 0.0 – 0.4 | Plain pH-corrected water |
Nitrogen deserves special attention during the stretch: the plant builds a lot of structure in those two weeks and pales quickly if the transition feed cuts nitrogen too sharply. Watch the oldest fan leaves; they are the first to fade when reserves run low.
Once buds set, shift the balance to phosphorus and potassium and hold EC near 1.5. Ease off anything heavy in the last two weeks and flush well; delicate fruity terpenes are the first casualty of a dirty finish.
Training and Flipping to 12/12
Top the plant above the fourth node early, around day 18-21, and again a week later on the strongest two mains if you want a wider frame. Follow with low-stress training, pulling every leader down to horizontal. You are not shaping this plant for esthetics; you are fighting for every inch of vertical headroom you will desperately want later.
Flip to 12/12 when the canopy fills barely half of your footprint. That sounds early, and it is meant to: Cindy 99 stretches two to three times its size after the flip, the signature move of its 70% sativa blood. Flowering then runs 8-10 weeks, fast enough that the long-sativa dread never materializes. Keep bloom humidity at 40-45% with steady airflow; the buds run slimmer than indica colas but still stack tight along the branches.
Managing the Height of Cindy 99
At up to 9.84 ft outdoors, this is one of the tallest plants in the Blimburn Seeds catalog, and pretending otherwise ruins grows. Indoors, the full toolkit applies: short veg, early topping, aggressive low-stress training, and a screen (ScrOG) if you have one, with every shoot woven horizontally as it grows. Done right, a plant that wanted to be a tree finishes as a flat, even table of colas at 4 ft.
Outdoors, flip the problem into the advantage it really is. Plant directly in the ground in a sunny, discreet corner, stake or cage the main stem early, and let the vertical ambition work for you; height is exactly where those 21-24 oz harvests come from. In a tropical or warm climate the plant cruises through summer heat and comes down in October. Gardeners who need discretion can bend the main stem horizontal early and grow it as a sprawling bush instead.
Harvesting and Curing Cindy 99
Watch trichomes from week 7 after the flip. Harvest at cloudy with the first ambers for the bright, talkative character that made the name, or wait a few more days if you want the relaxed side to lead. In October, outdoor plants this size come down branch by branch over several days, so plan drying space for a small tree.
Dry at 59-68°F and around 55% humidity for 10-14 days, then cure in glass for at least two weeks. The fruity sweetness that seems light at harvest concentrates beautifully in the jar; by week three it smells like a bowl of ripe orchard fruit with a sweet, almost candied edge.
What to Do With Your Trim
A 3-meter plant produces trim by the bagful, and C99-family resin has always been prized for concentrates. Freeze it for bubble hash, dry-sift for kief, or set a portion aside for infused butter where the fruity profile carries through. With this much material, even a modest percent return becomes a serious jar of concentrate.
Aroma, Flavor and Terpenes
Fruity and sweet is the whole flavor story, and the datasheet backs it with one of the more unusual terpene lists in the catalog. Terpinolene leads with the bright, fruity sparkle classic to this family, and nerolidol deepens it with notes of ripe pear and blossom. Terpineol adds a soft lilac sweetness you rarely meet in cannabis, while pinene keeps the profile fresh and clean.
The quieter pair does the seasoning: carene brings a sweet, earthy warmth and eugenol a trace of clove that gives the exhale its gentle spice. Alpha-phellandrene completes the seven-strong list. None of the loud modern terpenes dominate here, which is exactly why cured Cindy 99 smells like fruit candy instead of fuel, and why fans of vintage sativa flavor keep coming back to it.
Common Problems and Pro Tips
Cindy 99 is a rewarding grow, but it is a tall, stretchy 70% sativa that can reach 3 m, so height control comes first.
- Control the height: outdoors it can reach 3 m, so indoors run a short veg, top it early and use low-stress training or a SCROG net to keep it near a manageable height.
- Plan the vertical space: it stretches hard after the flip, so decide on your space and training before you germinate, not after the stretch has already started.
- Keep air moving: it finishes fast for a sativa and prefers warmth, so keep a fan moving air through the open canopy so the buds ripen evenly.
Expert tip: its ripe pear and orchard-fruit flavour turns almost candied after a two to three week cure, one of the best-loved vintage sativa profiles. Dry slowly and give it that time in jars.
Frequently Asked Questions
Is Cindy 99 the same as Cinderella 99?
Cindy 99 is the classic grower nickname for Cinderella 99, and this strain follows the original Princess x Cinderella 88 recipe behind the legend. Note that the Blimburn Seeds catalog also carries a separate product named Cinderella 99 with its own distinct lineage, so check the datasheet when comparing the two.
How tall does Cindy 99 grow?
Outdoors in open soil it reaches up to 9.84 ft (3 m), true sativa territory. Indoors, a short veg, early topping and low-stress training keep it near 4 ft. Plan vertical space before germinating, not after the stretch starts, since this one really runs once it flips to flower.
How long does Cindy 99 take to flower?
Flowering runs 8 to 10 weeks after the 12/12 flip, remarkably fast for a 70% sativa. Outdoor plants in tropical to warm climates finish in October. That speed was the breakthrough that made this genetic line famous in the late nineties, and it is a big part of the appeal today.
How much does Cindy 99 yield?
Indoor growers harvest 1.47 to 1.8 oz/ft² (450 to 550 g/m²) from a trained canopy. Outdoors, a full-size plant in the ground delivers a generous 21.16 to 24.69 oz (600 to 700 g), with the height directly powering that output, so give it room and sun to reach the top of the range.
How strong is Cindy 99?
Flowers test at 20 to 22% THC, a solid medium level. The experience leans happy, talkative and social rather than overwhelming, which is faithful to the original C99 character and makes it an easy strain to enjoy in company, without the knockout intensity of some modern hybrids.
What does Cindy 99 taste like?
Ripe fruit and sweetness front to back: pear and orchard fruit notes over a soft floral base, with a faint clove spice on the exhale. After a two to three week cure the profile turns almost candied, one of the best-loved vintage sativa flavors, so give it that time in jars.
