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Navigating the Growth Cycle: An In-Depth Guide to Cultivating Autoflowering Cannabis

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The 420 Gardener

Growing autoflowering cannabis requires a deep understanding of the plant’s unique lifecycle and needs. These plants are prized for their rapid growth and resilience, but they require careful attention to thrive. This extended guide covers the intricacies of growing autoflowering cannabis, from seed selection to harvest, providing detailed insights for both novice and experienced growers.

Seed Selection and Germination

Choosing the Right Seeds:

  • Autoflowers are available in numerous strains, each with its own characteristics and growth requirements. Consider THC/CBD levels, taste, aroma, and suitability for your growing conditions when selecting seeds​​.
  • Reputable online seed banks or local dispensaries can be good sources for quality seeds. Research the supplier’s reputation before purchasing​​.


  • The germination process typically takes 1-5 days. Ensure a humid environment with temperatures between 70-85°F for optimal germination. Use a potting mix rich in nutrients and with good drainage​​.

Seedling Stage (Weeks 1-2)

  • Maintain high humidity and gentle care during this stage. Avoid overfeeding; half the recommended nutrient dose is usually sufficient.
  • A temperature around 68°F and humidity levels around 70-90% are ideal. This stage is crucial for establishing a strong root system​​​​.

Vegetative Stage (Weeks 3-4)

  • This stage requires careful monitoring. Autoflowers grow rapidly, so any stress or damage can significantly affect their development.
  • Implement low-stress training (LST) techniques like bending or tying to control plant structure. Avoid high-stress methods such as topping or fimming, as autoflowers have limited time to recover from stress​​.

Transition to Flowering (Weeks 5-6)

  • Autoflowers will automatically enter the flowering stage based on age, not light cycles. This is typically around week 5 or 6.
  • Increase water and nutrient supply, focusing on phosphorus and potassium to support budding. However, be cautious of overfeeding, which can harm the plants​​.

Monitoring and Adjusting (Week 7)

  • Maintain optimal conditions in terms of light, temperature, and humidity. Dropping humidity to around 40% and keeping temperatures around 68°F can reduce the risk of mold and pests​​.
  • This period is crucial for identifying and addressing any issues such as nutrient deficiencies, pests, or diseases.

Late Flowering and Preparation for Harvest (Weeks 8-9)

  • Flushing may be initiated around week 8. This involves stopping the use of fertilizers to clear any residual nutrients from the soil, although opinions vary on its necessity​​.
  • Light defoliation can help improve light penetration to the lower buds. Handle the plants gently to avoid stress​​.

Harvesting (Weeks 10-12)

  • Timing is critical for harvesting. Look for signs like the color of trichomes and pistils. Milky white trichomes indicate peak THC levels, while amber trichomes suggest a more mellow effect​​.
  • Post-harvest, drying and curing follow standard cannabis practices. Aim for a humidity level of around 62% during curing for optimal quality​​.

Special Considerations for Autoflowering Cannabis

  • Lighting: Autoflowers don’t need a change in light cycles to flower. An 18/6 or 24/0 light schedule is commonly used. However, continuous 24-hour lighting might increase costs without significant yield benefits​​​​.
  • Nutrient Sensitivity: Autoflowers are generally more sensitive to nutrients due to their smaller size. Start with pre-fertilized soil and gradually introduce nutrients at a reduced dose. Overfeeding can lead to nutrient burn​​.
  • Training Techniques: Due to the rapid lifecycle, the best time for training is early in the vegetative stage. Employ low-stress training to avoid damaging the plants​​.
  • Soil and pH: Autoflowers prefer slightly acidic to neutral soil (pH 6.0-7.0). Regularly test soil pH to ensure optimal nutrient absorption​​.
  • Watering: Be cautious with watering; overwatering can lead to root rot, while under-watering can stress the plant. The water needs may vary depending on the growth stage and environmental conditions​​.


Autoflowering cannabis offers a unique and rewarding cultivation experience but demands an understanding of their specific requirements. Attention to detail in each stage of growth, from germination to harvest, is crucial. By following these guidelines, growers can optimize their autoflowering cannabis cultivation, ensuring healthy plants and abundant yields.

This guide provides a comprehensive overview for growers

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