How to Revive a Stunted Autoflower: Tips and Tricks

Understanding Stunted Autoflowers

Stunted Autoflowers

Growing cannabis plants indoors can be difficult, especially if you are a novice. However, even experienced growers have to deal with stunted plants from time to time. Autoflowers, in particular, can be tricky to grow because they do not have a set vegetative period. Stunted autoflowers can be frustrating because it is not always easy to tell what the problem is. In this guide, we will highlight some of the reasons why your autoflowers may be stunted, and what you can do to fix the problem.

One of the most common reasons why autoflowers may become stunted is because of overwatering. Overwatering can lead to several problems, such as root rot, which can cause your plants to stop growing. The roots of autoflowers are delicate and can easily be damaged by excess water. If you notice that your soil is consistently wet or that your plant is not showing any new growth, it may be time to reconsider your watering schedule.

Another reason why your autoflowers may be stunted is due to nutrient deficiencies or imbalances. Autoflowers have a short lifecycle, so it is essential to give them the nutrients they need to grow correctly. Typically, a cannabis plant needs nitrogen, phosphorus, and potassium to grow healthily. However, if your plant is showing signs of stunting, it may be because it is lacking one or more of these essential macronutrients.

On the other hand, too much of a good thing can also be detrimental to your plants. Overfeeding your autoflowers can lead to nutrient burn, which can cause leaf tips to turn brown. Nutrient burn can also lead to stunted growth, so it is essential to follow a feeding schedule that is appropriate for your plant’s growth stage and strain.

In addition to overfeeding, light stress can also cause your autoflowers to become stunted. Autoflowering plants rely heavily on light, and any form of light stress can significantly impact their growth. Light stress can come in many forms, such as too much or too little light, light leaks during the dark cycle, or light being too close or too far away from your plants. All these factors can cause your plant’s growth to slow down, which can lead to stunting.

Finally, genetics can also play a role in stunted autoflowers. Some strains are naturally smaller and may not grow as tall or produce as much yield as other strains. If you suspect that genetics are the cause of your stunted autoflowers, there may not be much you can do to fix the problem other than choosing different strains that are known for their vigor and yield potential.

In conclusion, stunted autoflowers can be challenging to deal with, but with a little patience and attention to detail, you can nurse your plants back to health. Understanding the common causes of stunting, such as overwatering, nutrient deficiencies, light stress, and genetics, can help you diagnose the problem and take the necessary steps to fix it. Remember to be gentle with your autoflowers, and be consistent with your feedings and watering to ensure that your plants grow healthy and robust. Fostering a healthy environment for your plants is key to a bountiful harvest!

Adjusting Nutrient Intake

Adjusting Nutrient Intake

If you have a stunted autoflower, one of the most common issues that could be the root cause of the problem is poor nutrient intake. Most growers will agree that autoflowers consume fewer nutrients than photoperiod strains. That said, they still require a certain level of nutrients to give you good yields. Therefore, when you notice stunted growth, it could be an indication of nutrient deprivation or toxicity.

A lack of nutrients could be caused by various factors, such as a deficiency in the soil or poor feeding practices. On the other hand, nutrient toxicity occurs when too much food is given to the plant. It can also be due to issues with the pH levels of the soil, leading to poor nutrient uptake or nutrient lockout.

So, how do you adjust the nutrient intake for your stunted autoflower? Here is a step-by-step guide to help you:

1. Check the Soil Nutrient Levels

You should start by testing the nutrient levels in the soil. You can do this by taking a sample of the soil and running a test to determine the nutrient levels in it. This way, you will know the kind of nutrients that are lacking or in excess and make the necessary adjustments to fix the problem.

2. Improve the Soil pH Levels

As previously mentioned, pH levels can greatly affect nutrient absorption. Most crops grow best in pH values ranging from 6.0 to 7.0, and cannabis is no exception. If your soil pH is off, your plant won’t be able to access the necessary nutrients, which can lead to stunted growth. To improve the soil pH levels, you can use materials like limestone to raise the soil pH or phosphoric acid to lower the pH. Either way, a proper pH level will help your plant access more nutrients and grow taller.

3. Reduce or Increase Nutrients

Some deficiencies may be related to the lack of a particular nutrient, while others may be related to the lack of several nutrients. In any case, you need to decrease nutrients that are in excess while increasing those that are deficient. A professional cannabis grower should know the optimal feeding cycles and ratios based on the plant’s growth stage.

4. Use Quality Fertilizers

Quality fertilizers contain essential nutrients needed for optimal growth. Compound fertilizers blended with various minerals and nutrients are excellent for a stunted autoflower. They are easy to dissolve in water and applied to the soil or sprayed directly on the leaves. Applying fertilizers will provide optimal conditions for your plants to grow tall and healthy.

In conclusion, a stunted autoflower could be due to nutrient deprivation, pH levels, poor feeding practices, genetic issues, and so forth. It’s vital for your plant’s growth to have the right amounts of nutrients. You should always check the soil nutrient levels, improve the soil pH levels, adjust nutrient intake, and use quality fertilizers. By taking action and making adjustments in your autoflower cannabis garden, you’re one step closer to achieving the desired height and yield.

Proper Lighting Techniques

Proper Lighting Techniques

Light is one of the most important factors for the growth of your autoflower plants. As these plants are sensitive to light, mishandling them may lead to stunted growth or may even cause the plants to die. You need to make sure that you give your autoflower plants the right amount and quality of light to ensure their growth and success. Here are three proper lighting techniques for your stunted autoflower plants:

1. Avoid Overexposure to Light

While autoflower plants require optimal light levels, overexposure to light can stunt their growth. Plants that are exposed to too much light may start to wilt, yellow, or even die. Overexposure can also dry out the soil and the roots and cause the plants to absorb too much water, leading to root rot. Furthermore, too much light can also raise the temperature levels in your grow room, further damaging your plants.

One way to avoid overexposure to light is to keep a close eye on your plants and adjust the light schedules accordingly. Keep track of how your plants react to light and adjust the intensity and duration as needed. You can also consider using a reflective material or installing light-blocking screens to help regulate the amount of light that your plants receive.

2. Use the Right Type of Lighting

Autoflower plants require specific wavelengths of light to grow and thrive. Different types of lights can deliver different wavelengths, and each type has its benefits. The three most commonly used types of grow lights are LED, HPS, and CFL.

LED lights are known for their low energy consumption and long lifespan, making them a cost-effective option. They are also versatile and can provide the optimal wavelengths of light for your plants. HPS lights are also commonly used as they provide the necessary light intensity that some plants require. Lastly, CFL lights are used to provide a more focused and penetrative light source. They are easy to set up and are perfect for small or medium-sized grow rooms.

When choosing the right type of lighting for your stunted autoflower plants, consider your budget, the type of plants you are growing, and the size of your grow room.

3. Use Adequate Lighting Time

Proper lighting time is critical for the growth of your autoflower plants. Just like overexposure to light can damage your plants, a lack of light exposure can also lead to stunted growth. If your plants are not receiving enough light, they may start to grow slower, become weaker and less productive.

While the optimal lighting time may vary depending on the type of plants and grow lights you are using, most autoflower plants require between 18 to 24 hours of light each day. Give your plants adequate light exposure, and make sure to turn off the lights for at least 6 hours each day to prevent heat buildup and allow your plants to rest.

If you notice that your autoflower plants are still stunted despite adhering to the proper lighting schedule, consider other factors such as temperature, humidity, and nutrient levels.

In conclusion, providing your stunted autoflower plants with proper lighting is crucial for their growth and success. Avoid overexposure to light, use the right type of lighting, and provide them with adequate lighting time to ensure their optimal growth. Take the time to monitor your plants’ reactions to light, and make the necessary adjustments as needed. With the right lighting techniques, your stunted autoflower plants are sure to flourish and produce healthy and abundant yields.

Addressing Temperature and Humidity Levels

Temperature and Humidity Levels

When it comes to growing plants, temperature and humidity levels play a crucial role in their growth and development. Autoflowers are no exception to this rule. If your autoflower is stunted, it may be due to unfavorable temperature and humidity conditions. Here are some tips on how to address these issues and bring your stunted autoflower back to life.



Temperature is one of the most important factors that affect the growth of plants, including autoflowers. For autoflower seeds to germinate, the optimum temperature is between 20°C to 30°C. Once they have germinated, the temperature should be maintained between 22°C to 26°C during the day and 18°C to 20°C during the night.

If the temperature is too low, your plant may not grow or even die. On the other hand, if the temperature is too high, the plant may experience stunted growth and other problems such as heat stress. Heat stress can cause the leaves to curl up and turn yellow, and it can also lead to reduced yields.

To address temperature-related issues, it’s important to monitor the temperature and make necessary adjustments. You can use a thermometer to check the temperature in the grow room and adjust it accordingly. You can also use fans or air conditioning to regulate the temperature.



Humidity is another critical factor that affects the growth of autoflowers. To achieve optimal growth, the humidity levels should be maintained between 40% to 70%. If the humidity levels are too high or too low, the plant may experience stunted growth, mold, and other issues.

If the humidity levels are too high, it can lead to mold growth and cause the leaves to droop. To address this issue, you can use a dehumidifier or increase ventilation in the grow room. On the other hand, if the humidity levels are too low, it can cause the plant to lose moisture leading to dry leaves. To address this, you can use a humidifier or place a water tray near the plant to increase humidity levels.

It’s essential to monitor the humidity levels regularly and maintain them at the optimal range. You can use a hygrometer to measure the humidity levels and adjust them accordingly. A grow room of a good size can accommodate air purifiers, dehumidifiers, and humidifiers at the same time. Proper installation and consistent monitoring are the keys to keeping your autoflowers healthy.


Addressing temperature and humidity levels is crucial to the growth and development of your autoflowers. By monitoring these factors and making necessary adjustments, you can ensure that your autoflowers receive the optimal conditions for healthy growth. Keep in mind that other factors like light, nutrients, and watering also play a role in the growth of autoflowers, and they need to be considered and monitored carefully.

Keeping your autoflower healthy and happy is a continuous process, but it can be very satisfying when done correctly. With patience, consistent monitoring, and appropriate adjustment of temperature, humidity, and other factors, you can bring your stunted autoflower back to life and harvest a bountiful crop.

Correcting pH Imbalances

pH Imbalances

One of the most common reasons for stunted autoflower is an improper pH level. The ideal pH level for autoflowering plants is around 6.0-6.5, which means the soil is slightly acidic. If the pH level is too low or too high, the nutrient uptake by plants may be hindered, leading to slower growth and ultimately stunting.

Fortunately, there are a few ways to correct pH imbalances. Here are some of them:

1. Test your soil pH

The first step in correcting pH imbalances is to test your soil’s pH level. You can use a pH testing kit, which you can purchase at your local garden center or online. The kit will come with detailed instructions on how to test your soil’s pH level. Once you have the results, you can determine if you need to adjust the pH level accordingly.

2. Adjusting pH level

If the pH level is too low, you need to add lime or wood ash to increase it. If it is too high, you can use sulfur or aluminum sulfate to reduce it. Be careful when adding these substances, as overdoing it can cause more harm than good. It is recommended to add the substances gradually, in small amounts, and re-test the pH level until it reaches the ideal range.

3. Use pH-neutral water

If you are using tap water to water your plants, ensure that the pH level is within the ideal range. In case your tap water has a different pH level, consider using pH-neutral water, like distilled water or rainwater, to water your plants.

4. Use pH-balanced nutrients

Ensure that the nutrients you are using are pH-balanced. Most nutrient products come formulated for a specific pH level, so ensure to check the nutrient product’s label. The ideal pH level for most nutrient products is around 6.0-6.5, which aligns with the ideal pH level for autoflower plants.

5. Consider using pH-buffering soil

pH-buffering soil

If you are growing autoflower plants, it is ideal to use pH-buffering soil. The soil will adjust its pH level to keep it within the ideal range. pH buffer in the soil will resist the soil pH level from fluctuation. This will make the soil conditions consistent, benefiting your plants’ growth and reducing the risk of stunting growth.

In conclusion, it is essential to maintain the right pH level for your autoflower plants to ensure they grow healthy and strong. Correcting pH imbalances is a crucial step in nurturing your plant. Knowing how to address pH imbalances can save your plants from stunting growth and other issues.

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top