How to Manage Your Cannabis Plants in the Flowering Stage


Cultivating cannabis plants can be an exciting and rewarding experience for enthusiasts and medical users alike. Whether you’re a seasoned grower or just starting out, understanding how to manage your cannabis plants in the flowering stage is crucial for achieving optimal results. This stage is when your plants transition from the vegetative phase to the flowering phase, and proper care during this period can significantly impact the quality and yield of your harvest. In this comprehensive guide, we’ll delve into the key factors and techniques involved in managing your cannabis plants during the flowering stage.

Understanding the Flowering Stage

Before we dive into the specifics of managing cannabis plants in the flowering stage, let’s first understand what this stage entails. The flowering stage is the crucial period when your cannabis plants shift their focus from growing leaves and stems to developing flowers or buds. This transition occurs when you adjust the light cycle to initiate flowering, typically by reducing the daily light exposure to 12 hours or less. During the flowering stage, your plants will exhibit significant changes in growth and appearance. They will develop dense clusters of buds, emit a strong aroma, and may require additional support due to the weight of the flowers. Proper management during this stage is essential to ensure healthy bud development, maximize yields, and maintain the overall well-being of your plants. (Read more about marijuana flowering stages weeks 1 to 4.)

The Importance of Light and Darkness

Light Exposure in the Flowering Stage

During the flowering stage, providing the appropriate amount of light is crucial for the health and productivity of your cannabis plants. The duration and intensity of light exposure significantly influence bud development and resin production. It’s recommended to provide your plants with 12 hours of uninterrupted darkness each day, followed by 12 hours of intense light. This light cycle mimics the natural conditions that trigger flowering in cannabis plants.

The Role of Darkness

Darkness is equally important as light during the flowering stage. During the dark period, a crucial process called “phytochrome conversion” occurs. This process triggers hormonal changes in the plant, promoting bud development. It’s essential to maintain a consistent and uninterrupted dark period as any light interruption, even for a brief moment, can disrupt this process and negatively impact your plant’s growth.

Monitoring Light and Darkness

To ensure the proper light and dark cycle for your cannabis plants, it’s recommended to use a timer to automate the lighting schedule. This will help you maintain consistency and avoid human error. Additionally, consider using light-proof curtains or blackout materials to prevent any light leaks during the dark period. Light leaks can confuse your plants and hinder their flowering progress.

Nutrient Requirements in the Flowering Stage

Transitioning to Flowering Nutrients

As your cannabis plants enter the flowering stage, their nutrient requirements change. During the vegetative phase, plants primarily need nitrogen for leaf and stem development. However, in the flowering stage, they require more phosphorus and potassium to support healthy bud formation and resin production.

Phosphorus and Potassium

Phosphorus plays a critical role in energy transfer and DNA synthesis, promoting robust root development and bud formation. Potassium, on the other hand, aids in nutrient absorption, enhances flower size and quality, and helps the plant resist diseases and stress. It’s crucial to provide your plants with a well-balanced nutrient solution containing the appropriate ratio of phosphorus and potassium during the flowering stage.

Avoiding Nutrient Burn

While it’s important to provide the necessary nutrients, overfeeding your plants can lead to nutrient burn, a condition where the tips of the leaves turn yellow or brown. To avoid this, always follow the manufacturer’s instructions for nutrient dosage and dilute the solution to the recommended strength. Regularly monitor the pH levels of your nutrient solution and adjust as needed, as imbalanced pH can affect nutrient uptake.

Temperature and Humidity Control

Optimal Temperature Range

Maintaining the right temperature in your grow space is crucial for the health and productivity of your cannabis plants. During the flowering stage, it’s recommended to keep the temperature between 68-78°F (20-25°C) during the day and slightly cooler at night. Temperature fluctuations outside of this range can stress your plants and negatively impact bud development.

Humidity Considerations

Humidity levels also play a significant role in the flowering stage. Initially, it’s ideal to keep the humidity levels around 40-50% to prevent mold and mildew growth. As your plants progress further into the flowering stage, gradually reduce the humidity to around 30-40% to promote resin production and prevent moisture-related issues.

Ventilation and Air Circulation

Proper ventilation and air circulation are essential for maintaining optimal temperature and humidity levels. Installing exhaust fans, intake fans, and oscillating fans can help ensure a steady airflow within your grow space. This helps prevent the buildup of stagnant air, reduces the risk of pests and diseases, and strengthens your plants’ stems.

Pruning and Training Techniques

Topping and FIMming

Pruning techniques like topping and FIMming (short for “fuck, I missed”) can be employed during the vegetative stage to promote bushier growth and increase the number of bud sites. However, it’s generally recommended to avoid aggressive pruning during the flowering stage as it can stress the plants and disrupt bud development.

LST (Low-Stress Training)

Low-stress training is a technique used to manipulate the shape and height of your cannabis plants without causing undue stress. This technique involves gently bending and securing branches to encourage more even light distribution and create a canopy of buds. LST is particularly beneficial during the flowering stage to ensure optimal light exposure for all bud sites.

Supporting Heavy Buds

As your plants enter the flowering stage, the weight of the developing buds can cause branches to droop or even break. Using trellises, stakes, or plant yoyos can provide support and prevent damage. Position the supports strategically to ensure the buds receive adequate airflow and light penetration.

Watering and Feeding Schedule

Watering Practices

Establishing a proper watering schedule is crucial during the flowering stage. Overwatering can lead to root rot and other moisture-related issues, while underwatering can stress the plants and hinder bud development. To determine when to water, monitor the moisture level of the soil or growing medium. Stick your finger about an inch into the soil, and if it feels dry, it’s time to water. Ensure proper drainage to prevent waterlogging.

Feeding Frequency

While the frequency of feeding may vary based on the nutrient medium and specific strains, it’s generally recommended to feed your cannabis plants every 1-2 days during the flowering stage. Monitor your plants closely for signs of nutrient deficiencies or excesses, such as yellowing or burnt tips, and adjust your feeding schedule accordingly.

Flushing Before Harvest

Flushing is the process of flushing out any residual nutrients or salts from the growing medium before harvest. This is done to improve the taste, aroma, and overall quality of the buds. Typically, flushing involves watering your plants with pH-balanced water for the final 1-2 weeks of the flowering stage. This allows the plants to use up any remaining nutrients and ensures a clean and smooth smoking experience.

Pest and Disease Prevention

Vigilant Monitoring

During the flowering stage, your cannabis plants are more susceptible to pests and diseases. Regularly inspect your plants for any signs of infestation or disease, such as webs, spots, or discoloration. Early detection is key to preventing the spread of pests or diseases and minimizing potential damage to your crop.

Integrated Pest Management (IPM)

Implementing an integrated pest management strategy can help you effectively manage pests while minimizing the use of harmful chemicals. This approach involves a combination of preventive measures, such as maintaining a clean grow space, using sticky traps, introducing beneficial insects, and employing organic pest control methods when necessary.

Proper Sanitation

Maintaining a clean and sanitary grow space is crucial for preventing the spread of pests and diseases. Regularly clean and disinfect your equipment, tools, and grow area. Remove any fallen leaves or plant debris promptly, as they can serve as breeding grounds for pests or pathogens.


How long does the flowering stage last? 

The flowering stage typically lasts between 8 to 12 weeks, depending on the strain and environmental conditions. Some strains may have shorter flowering times, while others may take longer to mature.

Can I switch back to the vegetative stage after flowering? 

Once your cannabis plants enter the flowering stage, it’s not advisable to switch them back to the vegetative stage. Doing so can disrupt their natural growth cycle, stress the plants, and significantly reduce yields.

Do I need to adjust the pH of my water during the flowering stage? 

Yes, maintaining the proper pH of your water is crucial during the flowering stage. Cannabis plants prefer a slightly acidic environment with a pH range of 6.0-6.5. Regularly test and adjust the pH of your water and nutrient solution to ensure optimal nutrient uptake.

When should I harvest my cannabis plants? 

Determining the right time to harvest your cannabis plants can be a bit tricky. It’s generally recommended to monitor the trichomes (tiny resin glands) on the buds using a magnifying tool. Harvest when the trichomes turn milky white or amber, indicating the ideal time for harvest.

Can I use synthetic nutrients during the flowering stage?

 Yes, synthetic nutrients can be used during the flowering stage. However, it’s important to carefully follow the manufacturer’s instructions and avoid overfeeding. Organic nutrient options are also available and can be beneficial for enhancing the taste and aroma of your buds.

What is the ideal relative humidity for drying and curing cannabis buds? 

For drying cannabis buds, aim for a relative humidity (RH) level of around 50-60%. This helps facilitate a slow and proper drying process. Once the buds are dry, the ideal RH for curing is between 60-65%. Proper drying and curing techniques are crucial for preserving the potency, flavor, and aroma of your harvested buds.


Managing your cannabis plants during the flowering stage is a crucial aspect of successful cultivation. By providing the right light cycle, nutrient balance, temperature and humidity control, training techniques, and proper care, you can maximize your yields and produce high-quality buds. Remember to monitor your plants closely, address any issues promptly, and maintain a clean and well-maintained grow space. With the right knowledge and attention to detail, you’ll be rewarded with a bountiful and satisfying harvest.

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