Some links in this post are affiliate links. If you make a purchase, we may earn a commission at no additional cost to you.
Autoflowering seeds are perfect for indoor growing because they’re fast, compact, and easy to care for. These strains flower based on age, not light cycles, making them beginner-friendly and efficient. Below are the 7 best autoflower strains for indoor setups, tailored to different needs like yield, growth speed, and potency:
- Granddaddy Purple Autoflower: Compact, disease-resistant, and ideal for tight spaces. Yields 5–15 oz/yd² in 70 days.
- Zkittlez Autoflower: Dense, bushy plants with yields of 16–17.6 oz/yd² in 60–65 days. THC: 16–20%.
- Bruce Banner Autoflower: High-yielding (16–21 oz/yd²) and potent (THC up to 25%). Moderate growing difficulty.
- Gelato Autoflower: Easy to grow, compact (24–39 inches), and yields 12–16 oz/yd². THC: Up to 26%.
- Mimosa Autoflower: Quick-growing (9–10 weeks), forgiving, and yields 10–12 oz/yd². THC: 21%.
- Wedding Cake Autoflower: Beginner-friendly with high yields (up to 600 g/m²) and a short cycle (7–8 weeks).
- Gorilla Punch Auto: Compact (28–47 inches), rich in cannabinoids (25.7%), and yields 450–550 g/m² in 56–63 days.
Quick Comparison Table
| Strain | Height | Yield (Indoor) | THC Content | Flowering Time | Difficulty |
|---|---|---|---|---|---|
| Granddaddy Purple | ~3.3 ft | 5–15 oz/yd² | Moderate | 10–14 weeks | Easy |
| Zkittlez | Medium | 16–17.6 oz/yd² | 16–20% | 60–65 days | Easy |
| Bruce Banner | 43–59 inches | 16–21 oz/yd² | Up to 25% | 10–11 weeks | Moderate |
| Gelato | 24–39 inches | 12–16 oz/yd² | Up to 26% | 8–10 weeks | Easy |
| Mimosa | 39–59 inches | 10–12 oz/yd² | 21% | 7–8 weeks | Easy |
| Wedding Cake | 35–47 inches | Up to 600 g/m² | Up to 20% | 7–8 weeks | Beginner |
| Gorilla Punch | 28–47 inches | 450–550 g/m² | Up to 26% | 56–63 days | Beginner |
These strains are compact, fast-growing, and yield well in controlled environments. For the best results, maintain temperatures at 70–80°F, humidity at 40–60%, and use a 20/4 light cycle. Whether you’re a beginner or experienced grower, these options ensure successful indoor harvests.
Auto Flowers! My best picks in 2024!
Key Features of Indoor Autoflowering Seeds
Autoflowering seeds are ideal for indoor cultivation because they flower based on age rather than light cycles. Their ruderalis genetics offer clear benefits for growers using controlled environments.
Automatic Flowering Cycle
These seeds simplify the growing process by starting to flower automatically after just 3–4 weeks. No need for complex light schedules.
Compact Growth Pattern
Autoflowering plants generally grow to a height of 1–4 feet by harvest. This smaller size is perfect for indoor setups, ensuring efficient use of space and even light exposure.
Quick Growth and Multiple Harvests
With a lifecycle of only 2–3 months from seed to harvest, growers can achieve multiple harvests within a year. This fast turnaround ensures consistent yields.
"Auto-flowering marijuana strains start automatically making buds (flowering) when they’re 3-4 weeks old. On average, plants are ready to harvest 2-3 months from germination. Sometimes as little as 55 days!" – Grow Weed Easy
Indoor Performance Metrics
Under the right conditions, these plants can produce yields of up to 500g/m².
| Feature | Details |
|---|---|
| Average Height | 1–4 feet |
| Time to Flower | 3–4 weeks |
| Total Growth Cycle | 8–12 weeks |
| Potential Yield | Up to 500g/m² |
In addition to their high yields, autoflowering strains are resilient and well-suited for indoor environments.
Resilience in Indoor Conditions
Thanks to their ruderalis genetics, these plants are naturally hardy and perform well even with varying indoor conditions.
1. Granddaddy Purple Autoflower
Granddaddy Purple Autoflower is a top pick for indoor growers thanks to its small size, straightforward care, and consistent harvests. This indica-heavy strain thrives in well-controlled, humidity-managed indoor setups.
Growth Characteristics
This plant stays compact, reaching about 3.3 feet (1 meter) tall, making it a great choice for tight spaces. It can yield between 5 and 15 ounces per square yard indoors.
Growing Requirements
For the best results, aim for these conditions:
| Parameter | Ideal Range |
|---|---|
| Temperature | 72–80°F |
| Humidity | 40–60% |
| Growth Cycle | 70 days |
| Flowering Period | 10–14 weeks |
These settings help the plant perform well in an indoor environment.
Key Benefits
This strain has strong resistance to diseases and works well in both soil and hydroponic systems, giving growers flexibility.
Environmental Control
To get the most out of Granddaddy Purple Autoflower, maintain proper indoor conditions. Use the right fertilizers and plant care products to maximize yields.
Its compact size, reliable harvests, and low-maintenance nature make it a solid choice for both beginners and experienced growers.
2. Zkittlez Autoflower
Zkittlez Autoflower is known for its impressive yields and ease of growth, making it a great option for indoor growers. Its compact size works well in controlled environments with limited space.
This strain grows to a medium height with a dense, bushy structure, producing yields of 450–500 grams per square meter (16–17.6 ounces per square yard).
| Growing Parameter | Specification |
|---|---|
| Flowering Period | 60-65 days |
| Indoor Yield | 16-17.6 oz/yd² |
| THC Content | 16-20% |
| CBD Level | <2% |
| Growth Pattern | Compact, bushy |
Ideal Growing Conditions
Zkittlez Autoflower thrives in warm environments and can handle a range of temperatures. This aligns with its strong performance indoors, where conditions can be controlled for consistency.
Care and Maintenance
To get the best results, focus on managing humidity and airflow, especially during the flowering phase. Here are some essential tips:
- Pruning: Trim excess leaves to improve airflow through the dense canopy. This helps avoid moisture buildup and lowers the risk of mold.
- Humidity Control: Keep humidity levels moderate, particularly as buds develop. This is crucial for preventing moisture-related issues that could harm your harvest.
- Air Circulation: Use proper ventilation systems to ensure steady airflow, which supports the plant’s bushy growth and overall health.
3. Bruce Banner Autoflower
Bruce Banner Autoflower is a high-yielding, potent strain ideal for indoor growers. This Sativa-dominant hybrid is known for its reliable indoor performance.
| Growing Parameter | Specification |
|---|---|
| Flowering Period | 10-11 weeks |
| Indoor Yield | 16-21 oz/yd² |
| THC Content | Up to 25% |
| Height | 43-59 inches |
| Growing Difficulty | Moderate |
| Genetic Makeup | 65% Sativa/35% Indica |
Best Growing Conditions
This strain thrives in indoor environments where temperatures stay between 68–80°F. During the flowering stage, aim for a relative humidity of 40–50%. These conditions help prevent issues like bud rot while enhancing trichome production.
Lighting and Nutritional Needs
Bruce Banner Autoflower performs best under strong LED or HPS grow lights. Its nutrient needs change as it grows:
- Vegetative stage: Focus on nitrogen-rich nutrients.
- Flowering stage: Shift to higher levels of phosphorus and potassium.
For soil, use one rich in organic matter and maintain a slightly acidic to neutral pH for optimal results.
Yield-Boosting Techniques
To maximize yields, try techniques like low-stress training (LST) and defoliation. These methods improve light exposure and airflow, encouraging better bud growth across the plant.
Care and Maintenance
Keep your plants healthy by:
- Allowing the soil to dry out between waterings.
- Ensuring proper ventilation to avoid mold or pest issues.
- Watching for signs of nutrient deficiencies or infestations.
- Providing at least 8 hours of strong light daily.
4. Gelato Autoflower
Gelato Autoflower is a balanced hybrid (50% Sativa, 50% Indica) created by combining Gelato #33 and Ruderalis genetics. With a stellar 4.9/5 rating from 33 verified growers, it’s a favorite for indoor setups.
| Growing Parameter | Details |
|---|---|
| Flowering Period | 8–10 weeks |
| Indoor Yield | Around 12–16 oz/yd² |
| THC Content | Up to 26% |
| Height | 24–39 inches |
| Growing Difficulty | Easy |
| Genetics | 55% Sativa / 45% Indica |
Best Growing Conditions
Keep temperatures steady between 72–75°F and maintain low humidity for best results. Its compact size makes it perfect for smaller indoor spaces. Plus, its sturdy genetics make it more resistant to common pests and diseases. Pay attention to proper nutrients and lighting to maximize its potential.
Lighting and Nutrient Needs
Start feeding nutrients at 1/8 strength, gradually increasing over time. During the flowering phase, focus on boosting phosphorus and potassium while carefully monitoring pH levels to avoid overfeeding.
Tips for Higher Yields
- Begin Low Stress Training (LST) early in the vegetative stage to promote bushy growth.
- Perform light defoliation to improve airflow and light exposure to lower branches.
- Use a carbon filter to manage its strong aroma.
Getting Ready for Harvest
Keep an eye on trichomes starting around week 6 to pinpoint the best harvest time. About 10 days before harvesting, flush the roots and reduce nutrients to enhance the buds’ quality and flavor.
sbb-itb-5407682
5. Mimosa Autoflower
Mimosa Autoflower is a popular choice among growers, earning a 4.5/5 rating from 296 reviews. With genetics that are 65% Sativa, 30% Indica, and 5% Ruderalis, this strain is compact and perfect for grow tents or small spaces. Its quick growth cycle – just 9–10 weeks from seed to harvest – produces yields of 10–12 oz/yd². This genetic mix not only supports healthy growth but also contributes to its distinct flavor and effects.
| Growing Parameter | Details |
|---|---|
| Flowering Period | 7–8 weeks |
| Indoor Yield | 10–12 oz/yd² |
| THC Content | 21% |
| Height | 39–59 inches |
| Growing Difficulty | Easy |
| Genetics | Mimosa x Orangeade Auto |
Flavor Profile and Effects
Mimosa Autoflower stands out with its citrus and diesel flavors. One grower shared their experience:
"Smells of citrus and orange! Beautiful plant. Will definitely be growing this strain again!" – C. T.
Tips for Indoor Growing
This strain thrives indoors, thanks to its forgiving nature and well-balanced genetics. Maintaining stable environmental conditions throughout the grow cycle allows it to respond well to standard indoor growing methods.
Harvest Expectations
When cared for properly, Mimosa Autoflower delivers consistent results. A satisfied grower noted:
"This is one of my favourites, great yield, fantastic flavour and done in no time.. so far one of best grows with this one.. highly recommended 👍" – V. G.
Keep an eye on the trichomes during the 7–8 week flowering phase to ensure you harvest at peak potency.
6. Wedding Cake Autoflower
Wedding Cake Autoflower is a highly-rated indoor strain with an impressive 4.7/5 rating from 2,175 reviews. This hybrid leans toward Indica, featuring a genetic mix of 55% Indica, 25% Sativa, and 20% Ruderalis. Its compact size makes it ideal for indoor setups.
| Growing Parameter | Details |
|---|---|
| Flowering Period | 49–56 days |
| Indoor Yield | Up to 600 g/m² (about 17.7 oz/yd²) |
| THC Content | Up to 20% |
| Height | 35–47 inches (90–120 cm) |
| Growing Difficulty | Beginner-friendly |
| Genetics | 55% Indica / 25% Sativa / 20% Ruderalis |
Indoor Growing Requirements
This strain thrives in controlled indoor environments. Plant 9–12 seeds per m² (8–10 per yd²) in 2.4–2.9-gallon (9–11 L) pots, ensuring seedlings are planted directly to avoid transplant-related stress.
Performance and Yield
With a short flowering time of just 7–8 weeks, Wedding Cake Autoflower consistently delivers strong results. To achieve the best yields, follow these practical tips during cultivation.
Growing Tips for Success
- Keep the climate stable during the flowering phase.
- Use nutrient-rich soil to encourage healthy growth.
- Apply training methods during the vegetative stage.
- Minimize stress on plants during flowering.
- Closely monitor and regulate humidity levels.
Its compact size, quick growth cycle of 65–70 days from seed to harvest, and reliable indoor yields make Wedding Cake Autoflower a solid choice for growers looking for efficiency and ease.
7. Gorilla Punch Auto
Gorilla Punch Auto is a standout choice among autoflowering seeds, designed specifically for indoor growing. With an impressive rating of 4.9/5 from 238 reviews, this strain offers a balanced genetic profile of 45% Sativa and 55% Indica. It boasts THC levels of up to 26% and a total cannabinoid content of approximately 25.7%.
| Growing Parameter | Details |
|---|---|
| Flowering Period | 56–63 days |
| Indoor Yield | 450–550 g/m² (1.5–1.8 oz/ft²) |
| THC Content | Up to 26% |
| Height | 28–47 inches (70–120 cm) |
| Growing Difficulty | Beginner-friendly |
| Total Cannabinoids | 25.695% |
Indoor Growing Requirements
This strain thrives in controlled indoor environments where growers can manage temperature, humidity, and light with precision. Its compact size makes it ideal for grow tents or smaller spaces. These controlled conditions help ensure stable growth and strong results.
Performance Highlights
Gorilla Punch Auto earned 2nd Place in the Best Sativa Category at the American Autoflowering Cup, showcasing its high-quality genetics and performance potential. To achieve the best results, follow these targeted growing tips.
Essential Growing Tips
- Provide Support: Use bamboo stakes or a SCROG net early on to support the plant’s heavy buds.
- Control Aroma: Install a carbon filter and exhaust fan to manage the strain’s strong scent.
- Maintain Optimal pH: Keep the soil pH between 6.0 and 7.0 for healthy growth.
- Use Low-Stress Training (LST): Maximize light exposure and airflow by gently training the plant.
When grown under the right conditions, Gorilla Punch Auto produces dense, cannabinoid-rich buds, making it a solid choice for both new and experienced indoor growers.
Strain Comparison Chart
When growing autoflowering strains indoors, maintaining a temperature of 70–80°F and humidity levels between 40–60% helps plants thrive. While individual strain requirements may differ slightly, these general conditions create a solid foundation for successful cultivation.
Here are some key indoor growing essentials for autoflowers:
- Proper spacing to allow roots to develop fully
- Good air circulation to prevent mold and promote healthy growth
- Effective ventilation systems to maintain fresh airflow
- Strategic light placement for even coverage
- Regular humidity checks to stay within optimal ranges
- Stable temperatures to avoid stress on plants
These guidelines work well for most autoflowering strains, though small adjustments may be needed based on specific traits of each variety. For more tailored advice, check out the next section on optimizing your indoor setup.
Growing Tips for Indoor Autoflowers
Getting the best results with indoor autoflowers starts with choosing the right containers and creating the ideal environment. Here’s how to set yourself up for success.
Container Selection
- For 1–4 plants, go with 2.65–4-gallon containers.
- For 5–10 plants in a SOG (Sea of Green) setup, use 1.72–2.25-gallon pots.
- Fabric pots are a great choice because they improve air circulation and drainage, helping to prevent root rot.
Light Cycles and Intensity
A 20/4 light cycle – 20 hours on, 4 hours off – is ideal for autoflower growth. Adjust light intensity and distance based on the plant’s growth stage:
| Growth Stage | PPFD (μmol/m²/s) |
|---|---|
| Seedling | 100–300 |
| Vegetative | 300–600 |
| Flowering | 600–900 |
Nutrient Schedule
If you’re using an inert medium, follow this feeding plan:
- Seedling Stage (Week 1): Use plain water only.
- Early Vegetative Stage (Weeks 2–3):
- Week 2: Feed with ⅛-strength vegetative nutrients.
- Week 3: Increase to ¼-strength vegetative nutrients.
- Pre-flowering and Flowering (Weeks 4–7):
- Weeks 4–5: Transition to ½-strength vegetative nutrients and start blending in bloom nutrients.
- Weeks 6–7: Fully switch to ½-strength bloom nutrients.
- Ripening Stage (Weeks 8–9): Flush with plain water to prepare for harvest.
For best results, keep a close eye on climate conditions to ensure proper nutrient absorption.
Climate Control Tips
- Use oscillating fans to keep air moving.
- Monitor conditions with a hygrometer.
- Keep temperatures between 68–79°F.
- Lower humidity levels during the flowering stage.
- Position LED lights 24–30 inches above the canopy.
Conclusion
To wrap up, these autoflowering strains are excellent choices for indoor growers. Each of the seven options has specific advantages, so pick the one that matches your space and goals.
These strains are perfect for indoor setups thanks to their efficient use of space, quick growth cycles, and solid yields. Under the right conditions, some can produce as much as 400 grams per square meter.
Keep in mind, successful indoor cultivation requires maintaining the right environment and following the growing tips shared earlier. Use this information to get the most out of your indoor harvests.