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40-day Flowering Seeds
40-day Flowering Seeds Best Sellers
All the catalog: 40-day Flowering Seeds
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40-Day Flowering Seeds: Grow Faster and Boost Your Harvest
40-day flowering seeds are cannabis strains genetically optimized to complete their flowering phase in just 5–6 weeks. They achieve this speed through selective breeding between fast photoperiod strains and autoflowering varieties, combined with stabilization techniques that prioritize speed without sacrificing potency. Unlike traditional strains (which take 8–12 weeks to flower), these seeds accelerate their metabolism to produce dense buds in record time.
At GB The Green Brand you’ll find a wide range of 40-day flowering seeds so you can choose the one that best fits your needs and preferences.
Types of 40-Day Flowering Seeds
There are two types of 40-day flowering seeds: ultra-fast autoflowering and optimized photoperiod strains.
Ultra-fast autoflowering
These seeds are known for being the fastest of the fast. Thanks to improved Ruderalis genetics, they begin flowering automatically after just 3–4 weeks of life, regardless of the light cycle. Ideal for:
- Outdoor grows in short summers: Harvest before the first frost hits.
- Beginners: No need to change light cycles, making them perfect for new growers.
- Discreet setups: They reach a maximum height of about 1m.
Optimized photoperiod strains
The choice of experienced growers. Although they require 12 hours of darkness to flower, their flowering stage is compressed to 40 days after the light change. Perfect for:
- Maximizing yields: Produce denser buds.
- SCROG setups: Full control over the vegetative cycle.
- Customized photoperiods: Indoors, you can trigger flowering when the plant reaches your desired size.
Characteristics of 40-Day Flowering Seeds
- Compact yields: 400–600 g/m² indoors (depending on genetics).
- THC levels between 18%–24%: On par with standard strains.
- Enhanced resistance: Less sensitive to fluctuations in temperature and humidity.
- Controlled height: 80–120 cm indoors, ideal for limited spaces.
Advantages of 40-Day Flowering Seeds
Using these 40-day flowering seeds comes with several advantages over slower varieties:
- More harvests: Shorter cycles mean you can fit more grows into the same timeframe and increase overall production.
- Energy savings: Indoors, fewer weeks of light use translates to lower electricity consumption.
- Stealth growing: Faster flowering means less time exposed—great for discreet cultivation.
- Perfect for testing: Try out different genetics without waiting months.
How to Grow Fast Flowering Seeds
Growing 40-day flowering seeds isn’t too different from growing longer varieties, but there are some key considerations:
Growing medium
Fast strains can thrive in soil, coco, or hydroponic systems. Each has its pros: soil is beginner-friendly, while coco and hydro offer faster growth rates.
Light cycle
Although faster than traditional photoperiods, Fast strains still require a controlled light cycle to trigger flowering.
Proper nutrition
Use stage-specific nutrients. During the vegetative phase, use nitrogen-rich fertilizers; during flowering, focus on phosphorus and potassium.
Climate control
Maintain a steady temperature of 72–79ºF (22–26ºC) and relative humidity between 40% and 60%. Moderate watering is also key—allow the soil to dry slightly between waterings.
Discover why our 40-day flowering seeds stand out
Geist OG Fast Flowering: The fastest cannabis seed
Geist OG Fast Flowering by Humboldt Seed Organization is the result of crossing Geist OG with OG Auto, stabilized over two years to reduce flowering to just 7 weeks. It stands out with a gassy profile featuring citrus, earthy and metallic notes, up to 26% THC, heavy resin production, and deeply relaxing effects.
Gushers Fast Flowering: The most productive cannabis seed
Gushers Fast Flowering produces up to 500 g/m² indoors thanks to its dense and resinous buds. Outdoors, it yields up to 900 g per plant and finishes around mid-September. Its resilience and compact structure make it a top performer in any environment.
Gorilla Cookies Fast: The most psychoactive cannabis seed
Gorilla Cookies Fast is a photoperiod hybrid (45% indica / 55% sativa) with a whopping 29% THC. It delivers an intense euphoric high followed by deep physical relaxation — ideal for experienced users looking for a strong psychoactive effect.
Strawberry Cake Ultra Fast CBG: The most medicinal cannabis seed
Strawberry Cake Ultra Fast CBG is a 100% medicinal strain with 0% THC and 6–8% CBG, complemented with CBD to enhance its anti-inflammatory and anxiolytic properties, offering therapeutic relief with no psychoactive effects.
Buy the best 40-day flowering seeds at GB The Green Brand
Discover the highest-rated and most popular genetics in our catalog:
| Strain | Use | Physical Effect | Psychoactive Effect | Cannabinoids | Flavors |
|---|---|---|---|---|---|
| Strawberry Cola Sherbet F1 Fast | Medicinal | Medium | Social / Relaxing | THC dominant | Fruity and citrus |
| Strawberry Cake Ultra Fast CBG | Medicinal | Strong | None | CBG and CBD | Sweet and spicy |
| Blueberry Muffin | Recreational | Medium | Social / Relaxing | THC dominant | Sweet and fruity |
| Sweet Mandarine Zkittlez F1 Fast Version | Recreational | Medium | Stimulating | THC dominant | Sweet and fruity |
| Golosa Early Version | Medicinal | Strong | Deeply relaxing | THC dominant | Sweet and spicy |
Frequently asked questions about 40-day flowering seeds
Are 40-day flowering seeds as potent as longer-flowering strains?
Can I grow them outdoors during winter?
Should I choose autoflowering or photoperiod seeds?
- Autoflowering: Easier and quicker, with a complete life cycle from seed to harvest in just 70 days.
- Photoperiod: Higher yields but require controlled light schedules to maximize production.