Growing autoflowering cannabis is ideal for beginners and experienced growers alike. This type of cannabis plant doesn’t rely on changes in light schedules to start flowering. Instead, it flowers automatically after a few weeks of growth, making the entire process more straightforward and quicker than traditional photoperiod cannabis strains. In this guide, we’ll walk you through how to grow autoflowering cannabis from seed to harvest.
Key Takeaways:
- Autoflowering cannabis plants are beginner-friendly due to their fast growth and resilience.
- Final pots should be used from the start because transplanting can stress these plants.
- Light cycles: Autoflowers do not need strict light schedules and can grow under 18-24 hours of light per day.
- Training: Use Low-Stress Training (LST) methods for autoflowers.
- Harvest: You can expect to harvest autoflowers in 8-12 weeks from seed.
What Is Autoflowering Cannabis?
Autoflowering cannabis is a variety that flowers automatically without needing specific light cycles. Traditional cannabis plants (photoperiod varieties) require controlled hours of light and darkness to start flowering. In contrast, autoflowering plants begin their flowering stage based on their age, making them ideal for beginners. If you’re wondering how to grow autoflowering cannabis, you’ll be happy to know that it’s a straightforward process that doesn’t require much experience with managing light schedules.
Why Choose Autoflowering Cannabis?
Autoflowers have shorter growth cycles, often finishing in 8-10 weeks from seed to harvest. However some strains can take up to 12 weeks to finish.These plants are resilient, small in size, and can thrive in various environments. For beginners or those with limited space, autoflowering strains are the way to go. Additionally, learning how to grow autoflowering cannabis is much simpler compared to photoperiod strains, as these plants don’t need meticulous light management to start flowering. Check out autoflowering cannabis seeds on our site for some popular options.
Seed Selection and Germination
Choosing the Right Seeds
The success of your grow largely depends on the quality of your seeds. Autoflowering cannabis seeds are available in many varieties, with some designed to produce higher yields, others to grow smaller, compact plants. For beginners, it’s essential to pick seeds from trusted seed banks like Crop House Seed Bank, which guarantee good genetics. Avoid seeds from unreliable sources, as they may not germinate or grow properly.
Pro tip: Opt for seeds with high resilience to pests and diseases if you’re new to growing.
How to Germinate Autoflower Seeds
Germinating seeds is the first step to success, and it’s quite easy. You can use the paper towel method, where you:
- Place your seeds between two damp paper towels.
- Keep them moist, but avoid waterlogging.
- After 24-72 hours, your seeds will sprout tiny roots.
Alternatively, you can plant them directly into the soil about 1/4 to 1/2 inch deep. This method is beginner-friendly, as it avoids handling delicate sprouts.
Learn more about germination techniques in our guide How to Germinate Marijuana Seeds.
Final Pot Size and Planting
Using the Right Pot Size
One of the unique characteristics of autoflowers is their dislike for transplanting. Since they flower based on age rather than light cycles, any shock from transplanting can stunt their growth, which leads to reduced yields. Always plant autoflowers in their final pots right from the start, which should typically be around 10-15 liters (2.5-4 gallons).
Pro tip: Fabric pots work well for autoflowers because they help the roots “air prune” themselves, preventing root-bound issues.
Preparing the Soil
Soil quality is crucial for healthy growth. Autoflowers prefer light, well-aerated soil. A mix like this works best:
- 3 parts peat moss
- 3 parts compost
- 2 parts perlite
- 1 part vermiculite
This mixture offers excellent drainage and the right amount of nutrients for the early stages of growth. Avoid heavy, clay-based soils as they can suffocate the roots.
Check out our guide on The Best Soil for Growing Autoflowers for more detailed information.
Light Requirements for Autoflowers
Understanding Light Cycles
Unlike photoperiod cannabis, autoflowering cannabis doesn’t depend on a strict light-dark cycle to flower. While they can technically grow under almost any light schedule, the most common and effective light cycle is 18 hours of light and 6 hours of darkness. Some growers even choose to run their lights 24 hours a day, although this is less efficient in terms of electricity, and its nice to give your plants a rest.
- Optimal Light Schedule: 18/6 or 20/4 (light/dark).
- Type of Light: LED lights are preferred for their energy efficiency and lower heat output. If you’re using High-Pressure Sodium (HPS) lights, make sure to monitor the temperature closely to avoid overheating your plants.
Learn more about Cannabis Lighting Techniques for autoflowers.
Watering Your Autoflowering Plants
Watering Tips for Beginners
Proper watering is one of the most critical aspects of growing autoflowers. Overwatering is a common mistake made by new growers. It’s important to keep the soil moist but not soggy, as too much water can cause root rot and kill your plants.
How to Water:
- Water your plants when the top 1 inch of soil feels dry.
- Use water that has been sitting out for 24 hours to allow chlorine to evaporate.
- Avoid watering too often; letting the soil dry out slightly between waterings encourages stronger root growth.
Want to dive deeper into watering techniques? Read our guide on How to Water Marijuana Plants.
Nutrient Management
Feeding Autoflowers
Unlike photoperiod plants, autoflowers don’t need as many nutrients, especially in their early stages. Start with a low-nutrient soil mix, and as the plant grows, slowly introduce nutrients.
Key Nutrient Phases:
- Vegetative Stage: Focus on nitrogen-rich nutrients to help the plant grow.
- Flowering Stage: Switch to nutrients higher in phosphorus and potassium to encourage bud development.
Many beginner growers make the mistake of overfeeding their plants. Autoflowers, due to their short life cycle, can’t handle high nutrient levels as well as other plants.
Want more tips on feeding? Check our guide on The Best Nutrients for Autoflowers.
Temperature and Humidity Control
Best Conditions for Growing
Autoflowers thrive in moderate temperatures. Ideally, maintain a temperature between 20-25°C (68-77°F). Autoflowers can tolerate cooler temperatures better than photoperiod plants, but it’s always good to keep things stable.
- Seedling stage: Keep humidity around 60-70% to help your seedlings thrive.
- Flowering stage: Lower the humidity to around 40-50% to prevent mold and mildew.
Low-Stress Training (LST)
Since autoflowers grow quickly and flower on a fixed schedule, it’s best to avoid high-stress training techniques like topping or super cropping, which can stunt their growth. Instead, use Low-Stress Training (LST). This method involves gently bending the branches to improve light exposure without damaging the plant.
Check out our full guide on Low-Stress Training for Autoflowers for step-by-step instructions.
Pest and Disease Management
Pests like spider mites, aphids, and fungus gnats can wreak havoc on your autoflowers. To prevent infestations, always inspect your plants regularly and keep the grow area clean.
- Use natural pest control methods like neem oil or predatory insects.
- Keep humidity and airflow in check to avoid mold.
Learn about the most common Pests and Diseases for Cannabis Plants.
Harvesting Autoflowers
One of the most exciting moments for any grower is harvesting. Autoflowering cannabis plants are ready for harvest around 8-10 weeks after germination. However, the best way to determine the right time is by checking the trichomes (small resin glands on the buds).
- Clear trichomes: Not ready.
- Milky trichomes: Time to harvest for a balanced effect.
- Amber trichomes: Harvest for a more relaxing, couch-lock effect.
Want to learn more about trichomes? Read our guide on What Are Trichomes to understand the best harvest timing.
FAQs About Growing Autoflowering Cannabis
How much light do autoflowers need?
Autoflowers thrive with 18-20 hours of light per day.
Can you grow autoflowers indoors and outdoors?
Yes! Autoflowers are versatile and can be grown in both environments.
How long does it take to grow autoflowers?
On average, you can expect 8-10 weeks from seed to harvest.
What is the best soil for autoflowers?
Light, well-draining soil with a mix of peat moss, compost, perlite, and vermiculite works best.
By following these steps, you’ll be well on your way to growing healthy and bountiful autoflowering cannabis plants. If you’re ready to get started, check out our selection of high-quality autoflowering cannabis seeds at Crop House Seed Bank
