Deadhead OG
aka Dead Head, Deadhead
- THC
- 20.5–25%
- Flowering
- 8–9 wk
- Terpene
- Caryophyllene
- Effect
- Relaxed
- Difficulty
- Beginner
Chem 91 strain
Kush × Hash Plant
Strain facts
Checked Oct 21, 2026 · 3 sources
Chem 91 is a hybrid that's intermediate to grow. It was bred from Kush and Hash Plant. Its THC is about 23% (sources say 19–27%), higher than 68% of the 2,347 strains in our database that list THC. It flowers in about 10.5 weeks (one source lists 10–11 weeks).
Learn to grow Chem 91: Indoor & Outdoor Growing course, $199
- Type
- Hybrid
- THC
- About 23%19–27% across 3 sources
- Top terpenes
- Caryophyllene peppery, spicy
- Limonene citrus
- Myrcene earthy, musky
- Lineage
- Kush × Hash Plant
- Grow difficulty
- Intermediate1 source
- Flowering
- About 10.5 weeks10–11 weeks · 1 source
3 sources for this profile
- CTU strain dataset (public strain listings)
Grow facts
- AllBud (strain database) THC
- Crop King Seeds (seed bank) CBD, difficulty, flowering, THC, yield indoor and yield outdoor
Grow facts come from the breeder first, then seed banks and strain databases. With 2 sources we show the range and the middle; with 3 or more, the range and the median, after leaving out values far from the rest. The breeder's own value is the anchor, unless it is far from every other source (outside their range and more than 20% from their median); then we show the full range and the median of all of them. A fact from a single source is marked "1 source", and a fact no source lists is left out. Yields are converted to one unit: indoor per square meter, outdoor per plant.
CTU writes every profile from these facts; we do not copy other sites' descriptions. Values that are a generic default in the source data are left out. Last checked Oct 21, 2026.
Source: CTU strain dataset (public strain listings and breeder info, checked by CTU), verified Oct 2026. Potency, flavor and effects vary by grower, batch and plant. Facts no source lists are left out.
How to grow Chem 91
The grow facts a breeder or public strain listing gives for Chem 91.
- Flowering time
- About 10.5 weeks10–11 weeks · 1 source. Slower than 95% of strains with a listed time
- Yield indoor
- About 400 g/m²1 source
- Yield outdoor
- About 550 g per plant1 source
- Difficulty
- Intermediate1 source. One of 884 intermediate-rated strains
Flowering window (weeks after the switch to 12/12)
- 1
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- 14
Sources: the breeder, seed banks and strain databases listed under sources, checked Oct 2026. Percentages compare with every strain in our database that lists the same fact.
Learn to grow Chem 91: Indoor & Outdoor Growing course, $199
About Chem 91
Chem 91, a hybrid strain, boasts a high THC content ranging from 23% to 27%, and its unique lineage of Kush and Hash Plant results in a distinct earthy and diesel flavor profile. This strain is favored by experienced growers due to its substantial yield potential, which requires careful cultivation practices to maximize output.
Effects people report
The high from Chem 91 begins with a euphoric lift, enhancing creativity and sociability. As the effects progress, users experience deep relaxation without full sleepiness, making it suitable for evening use. The duration of the high typically lasts 2-3 hours, transitioning from an energized state to a calm, tranquil finish.
Flavor and aroma
Upon opening, Chem 91 emits a pungent diesel aroma complemented by earthy undertones. The inhale showcases a citrusy zest, while the exhale leaves a skunky, lingering taste on the palate. Proper curing enhances these flavors, making the experience richer and more complex.
Growing notes
Chem 91 thrives both indoors and outdoors, with indoor growers benefiting from controlled environments to manage humidity and airflow. Outdoor cultivation is best in warm, dry climates to optimize yield, which can reach up to 700g per plant. Utilizing training methods like topping and LST helps manage its stretch and enhance light penetration for better bud development. Keep humidity between 40-50% during flowering to prevent mold growth, especially in densely packed buds.
Grower tips
- Top during week 3 of veg for optimal canopy
- Maintain humidity at 40-45% from week 6 of flower
- Start feeding at 0.8 EC, increasing by 0.2 weekly
- Ensure strong airflow to prevent mold due to dense bud structure.
Common mistakes
- Overwatering early can lead to root rot
- Poor airflow increases the risk of mold in dense buds
- Delaying topping past day 14 of veg can create an uneven canopy
- Harvesting too early diminishes overall potency and yield.
Expert insight
Chem 91's high nutrient sensitivity means growers often overshoot their EC levels by week 3 of flower, which can lead to nutrient lockout. Maintaining a lower feeding schedule until late flower helps prevent this issue and ensures optimal growth.
Who should grow Chem 91?
Experienced indoor growers using topping or LST to manage canopy and optimize yield; Growers in warm, dry climates who can control humidity and airflow effectively.
How it compares
Compared to Chem Dog, Chem 91 has a higher THC content and a more pronounced diesel flavor. In contrast to Chem's Sister, Chem 91 tends to yield more due to its denser bud structure. Deadhead OG offers a similar euphoric high but with a different flavor profile, leaning more towards earthy and pine notes.
Chem 91 FAQ
What is the THC level of Chem 91?
Chem 91 has a THC level ranging from 23% to 27%, making it a potent strain that should be approached with caution by novice users. Its high potency contributes to its popularity and efficacy for various uses.
Is Chem 91 indica or sativa?
Chem 91 is classified as a hybrid strain, combining elements of both indica and sativa. This balance allows for a range of effects, from relaxation to creativity, appealing to a wide audience.
How long does Chem 91 take to flower?
The flowering time for Chem 91 typically ranges from 8 to 9 weeks. This duration allows for optimal bud development and resin production, contributing to its overall potency.
Is Chem 91 easy to grow?
Chem 91 is best suited for experienced growers, as it requires careful attention to humidity and nutrient levels. Its high yield potential can be rewarding, but it demands knowledge for optimal results.
What does Chem 91 taste like?
Chem 91 presents a complex flavor profile that includes earthy, diesel, and citrus notes. This combination creates a rich and satisfying experience, especially when properly cured.
Chem 91 family tree
Parents and the strains bred from it, from published lineage.
This strain
Chem 91Hybrid · 19–27% THC · 10–11 wk
Bred from it
Animal GasAnimal Cookies x Chem 91
Cheese DawgChem 91 x Big Buddha Cheese
Cold Creek KushChem 91 x MK Ultra
Gas LeakChemdawg x Chem 91
Similar strains
Matched on shared parents, top terpenes, type and THC. Never on medical use.
Bc Kush
- THC
- 20–27%
- Flowering
- 7–9 wk
- Terpene
- Limonene
- Effect
- Energetic
Champagne Kush
aka Champagne
- THC
- 14% · CBD 0–6%
- Flowering
- 8–10 wk
- Terpene
- Caryophyllene
- Effect
- Euphoric
- Difficulty
- Intermediate
Grimmdica
- THC
- 14–18%
- Flowering
- 8 wk
- Terpene
- Myrcene
- Effect
- Relaxed
Where to buy
Find licensed dispensaries in your state
Only state-licensed stores, checked against official license lists.
Grow it
Flowering time, height and difficulty from the sources, then the full method in the Growing course.
