Cannabis Clones Turning Yellow

Cannabis Clones Turning Yellow: 7 Reasons, Solutions & Best Care Tips

Cannabis clones turning yellow is a common problem that many growers face. Yellowing can be an indication of a range of issues, from nutrient deficiencies to overwatering. Understanding the causes of yellowing in cannabis clones is essential in maintaining healthy plants and maximizing yields.

Identifying yellowing in cannabis clones is crucial in addressing the issue and preventing further damage. Growers must examine their plants regularly and look for signs of yellowing leaves, which may indicate nutrient deficiencies or other underlying problems.

Factors such as water and humidity, light and heat, root health and development, and nutrient management can all contribute to yellowing in cannabis clones.

Maintaining optimal pH and environment is also crucial in preventing yellowing and ensuring the health of cannabis clones. Growers must carefully manage their plants’ environment, including temperature, humidity, and light, to prevent stress and promote healthy growth.

By understanding the causes of yellowing and implementing proper management techniques, growers can prevent and address yellowing in cannabis clones.

Key Takeaways

  • Regular examination of cannabis clones can prevent further damage caused by yellowing.
  • Proper management of water, humidity, light, and nutrients can prevent yellowing in cannabis clones.
  • Maintaining optimal pH and environment is crucial in promoting healthy growth and preventing yellowing.

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Understanding Cannabis Clones

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Cannabis clones are cuttings taken from a mother plant, which are then rooted and grown into a new plant. Cloning is a popular method for growers to propagate their favorite strains, as it ensures the new plant will have the same genetics as the mother plant.

How Cloning Works

To clone a cannabis plant, a grower will take a cutting from the mother plant, usually from the lower branches. The cutting will then be dipped in rooting hormone and placed in a growing medium, such as rockwool or soil.

The cutting will then begin to grow roots, and once it has established a root system, it can be transplanted into a larger container and grown into a mature plant.

Common Issues with Cannabis Clones

One common issue with cannabis clones is that the leaves can turn yellow. This can be caused by a variety of factors, including overwatering, underwatering, nutrient deficiencies, or pests. Growers should carefully monitor their clones and adjust their growing conditions as needed to ensure healthy growth.

Tips for Successful Cloning

To ensure successful cloning, growers should follow a few basic tips:

  1. Use a clean, sharp cutting tool to take the clone
  2. Dip the cutting in rooting hormone to encourage root growth
  3. Keep the growing medium moist, but not waterlogged
  4. Provide adequate light and nutrients to promote healthy growth
  5. Monitor the clones closely for signs of stress or disease

By following these tips and monitoring their clones closely, growers can successfully propagate their favorite strains and ensure healthy, vigorous growth.

Identifying Yellowing in Cannabis Clones

Yellowing in cannabis clones is a common problem that can be caused by various factors. Identifying the cause of yellowing is essential for treating the issue. Here are some ways to identify yellowing in cannabis clones:

1. Yellow Leaves

The first sign of yellowing is yellow leaves. The lower leaves of the clone are usually the first to turn yellow. If the yellowing is caused by a nutrient deficiency, the yellowing will start at the tips of the leaves and move towards the center. If the yellowing is caused by over-watering, the yellowing will start at the center of the leaves and move towards the tips.

2. Leaf Veins

If the veins of the leaves are yellow, it is a sign of iron deficiency. Iron is essential for the production of chlorophyll, which gives the leaves their green color. Without enough iron, the leaves will turn yellow.

3. Leaf Tips

If the tips of the leaves are yellow, it is a sign of nutrient burn. Nutrient burn occurs when there is too much fertilizer in the soil. The excess fertilizer can cause the tips of the leaves to turn yellow and eventually brown.

4. Leaf Edges

If the edges of the leaves are yellow, it is a sign of light burn. Light burn occurs when the clone is exposed to too much light. The excess light can cause the edges of the leaves to turn yellow and eventually brown.

5. pH Levels

Checking the pH levels of the soil or growing medium is essential for identifying the cause of yellowing in cannabis clones. If the pH levels are too high or too low, the plant will not be able to absorb the nutrients it needs, which can cause yellowing.

Role of Water and Humidity in Clones Health

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Watering Practices

Watering practices play a crucial role in the health of cannabis clones. Overwatering or underwatering can cause yellowing of the leaves. It is recommended to water the clones only when the top inch of soil feels dry. The frequency of watering may vary depending on the size of the container, the growth stage of the plant, and the environmental conditions.

It is also important to adjust the pH of the water to prevent nutrient deficiencies. The ideal pH range for cannabis clones is between 5.5 and 6.5. A pH level outside of this range can cause nutrient lockout, leading to yellowing of the leaves.

Importance of Humidity Dome

Maintaining the right humidity level is essential for the growth of cannabis clones. The ideal humidity level for clones is between 70% and 80%. A humidity dome can help maintain the required humidity level and prevent moisture loss.

Misting the clones with water can also help maintain the required humidity level. However, excessive misting can cause waterlogging and lead to yellowing of the leaves. It is recommended to mist the clones only once or twice a day.

In addition to maintaining the humidity level, a humidity dome also protects the clones from external stress factors such as high winds, low temperatures, and pests.

Light and Heat Factors

Light and heat are two important factors to consider when it comes to growing cannabis clones.


Un-rooted clones require a specific amount of light intensity to grow properly. If the light levels are too high, it can cause the leaves to turn yellow and curl up. This is because excess light triggers increased photosynthesis, which in turn increases the plant’s demand for water and nutrients.

Light levels exceeding 180 ppfd can cause yellowing and cupping of leaves in fresh clones. It is important to ensure that the clones receive the right amount of light intensity to prevent the leaves from turning yellow.

Heat Mat

Heat mats are commonly used to provide warmth to the clones, which can help them root faster. However, it is important to ensure that the heat mat is not too hot, as this can cause the leaves to turn yellow and dry out.

Heat mats should be set to a temperature range of 72-78°F. Anything above this range can cause the clones to dry out and turn yellow.

Root Health and Development

Root health and development are crucial for the growth and survival of cannabis clones. The roots are responsible for absorbing water and nutrients from the growing medium, and any issues with the roots can lead to yellowing and other problems.

Rooting Hormones

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Rooting hormones can be used to promote root growth and development in cannabis clones. These hormones contain auxins, which are plant hormones that stimulate root growth. There are different types of rooting hormones available, including gel, powder, and liquid forms.

When using rooting hormones, it is important to follow the instructions carefully. Too much hormone can actually harm the plant, while too little may not have any effect. The rooting hormone should be applied to the cutting before it is placed in the growing medium.

Rooting in Different Mediums

Cannabis clones can be rooted in a variety of mediums, including rockwool, soil, coco, rapid rooters, and hydro systems. Each medium has its own advantages and disadvantages, and growers should choose the medium that works best for their specific needs and preferences.

Rockwool cubes are a popular choice for rooting cannabis clones. They provide a stable environment for the roots to grow, and can be easily transplanted into other growing mediums.

Soil is another option, and can be a good choice for growers who prefer a more natural approach. Coco coir is a soilless medium that is becoming increasingly popular, as it provides good drainage and aeration.

In hydro systems, such as DWC and aero-cloners, the roots are suspended in nutrient-rich water. These systems can be highly effective, but require careful monitoring and maintenance to ensure proper nutrient levels and oxygenation. Bubble cloners are another type of hydro system that use air stones to oxygenate the water and promote root growth.

Nutrient Management for Cannabis Clones

When it comes to growing cannabis clones, proper nutrient management is essential for healthy growth and development. Understanding essential nutrients and preventing nutrient burn are key factors in ensuring your clones thrive.

Understanding Essential Nutrients

Cannabis clones require a variety of essential nutrients to grow and develop properly. These nutrients include nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur. Nitrogen is particularly important in the early stages of growth, as it helps to promote healthy foliage and stem development.

To ensure your clones receive the proper balance of nutrients, it’s important to use a high-quality fertilizer. Look for a fertilizer that’s specifically formulated for cannabis clones, as this will provide the proper balance of nutrients for optimal growth.

Preventing Nutrient Burn

Nutrient burn is a common problem that can occur when cannabis clones receive too many nutrients. This can cause the tips of the leaves to turn brown and curl up, and can lead to stunted growth and reduced yields.

To prevent nutrient burn, it’s important to use a fertilizer that’s formulated for cannabis clones and to follow the manufacturer’s instructions carefully. Avoid overfeeding your clones, and be sure to flush the soil periodically to remove any excess nutrients.

In addition to proper nutrient management, using a product like Superthrive can help to promote healthy growth and development in cannabis clones. Superthrive is a vitamin and hormone supplement that can help to improve root growth, reduce transplant shock, and increase overall plant health.

Maintaining Optimal PH and Environment

Regulating PH Levels

Maintaining an optimal pH level is crucial for the health and growth of cannabis clones. The ideal pH range for cannabis clones is between 5.5 and 6.5. pH levels outside of this range can cause nutrient deficiencies or toxicities, which can lead to yellowing of leaves.

To regulate pH levels, growers can use pH testing kits to measure the pH of their nutrient solution. If the pH is too high, growers can add pH down to lower the pH level. If the pH is too low, growers can add pH up to raise the pH level.

It is important to note that pH levels can fluctuate over time, so growers should regularly check and adjust the pH level of their nutrient solution.

Ensuring Fresh Air and Proper Ventilation

Fresh air and proper ventilation are also important for the health and growth of cannabis clones. Stagnant air can lead to the buildup of harmful gases and pathogens, which can cause yellowing of leaves and other health problems.

To ensure fresh air and proper ventilation, growers should create a well-ventilated grow zone. This can be achieved by using fans and other ventilation systems to circulate air and remove stale air. Growers should also avoid overcrowding their grow zone, as this can limit air circulation and increase the risk of pathogen buildup.

In addition to proper ventilation, growers should also maintain a consistent temperature and humidity level in their grow zone. The ideal temperature range for cannabis clones is between 70 and 80 degrees Fahrenheit, while the ideal humidity range is between 50 and 70 percent.

Growers can use thermometers and hygrometers to monitor the temperature and humidity levels in their grow zone and make adjustments as needed.

By regulating pH levels and ensuring fresh air and proper ventilation, growers can help prevent yellowing of leaves and promote the health and growth of their cannabis clones.

Cannabis Clones Turning Yellow

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Cannabis clones turning yellow can be a common problem for growers, and it can be caused by a variety of factors. Here are some of the most common problems and solutions that growers can try to address the issue:

1. Dry Clones

Dry clones can lead to yellowing, as the plants are not getting enough moisture to thrive. Growers can try misting the clones regularly or placing them in a humidity dome to increase moisture levels. Additionally, using a rooting hormone like Clonex can help the clones establish roots and take in more water.

2. Lack of Growth

If the clones are not growing, they may not be getting enough nutrients. Growers can try adding a nutrient-rich solution to the medium or using tap water that has been pH balanced. Additionally, using a fan to circulate air around the clones can help them take in more CO2, which can promote growth.

3. Clonex Issues

While Clonex can be a great tool for rooting clones, using too much can lead to yellowing. Growers should follow the instructions carefully and avoid overusing the product. Additionally, if the clones are not responding well to Clonex, growers can try using a different rooting hormone or method.

4. Medium Problems

The medium that the clones are rooted in can also cause yellowing. If the medium is too wet, it can lead to root rot and other issues. Conversely, if the medium is too dry, the plants may not be getting enough moisture. Growers should ensure that the medium is properly balanced and not too compacted.

5. Tap Water

Using tap water that is high in minerals or other contaminants can also cause yellowing. Growers should consider using filtered or distilled water instead. Additionally, pH balancing the water can help ensure that the clones are getting the right nutrients.

6. Fan Leaves

Yellowing of the fan leaves can be a natural part of the cloning process, as the plants are adapting to a new environment. However, if the yellowing persists or spreads, it may be a sign of a more serious issue. Growers should monitor the plants closely and take action if necessary.

7. Hydro Shop

If growers are having trouble with their clones, they can also seek advice from their local hydro shop. These experts can provide guidance on the best products and methods for rooting and growing clones, as well as troubleshoot any issues that arise.

Frequently Asked Questions

Why are my cannabis clones yellowing?

Cannabis clones can turn yellow due to various reasons, including nutrient deficiencies, over or under watering, pests, and diseases. It is essential to identify the underlying cause of the yellowing to address the issue effectively.

Why are my cuttings turning yellow?

Cuttings can turn yellow due to stress from transplanting or cloning, nutrient deficiencies, or over or under watering. Ensure that the cuttings have adequate light, water, and nutrients to prevent yellowing.

Why are my cannabis clones rotting?

Cannabis clones can rot due to overwatering, poor drainage, or high humidity levels. Ensure that the clones are not sitting in standing water and have adequate airflow to prevent rot.

Is it normal for cannabis clones to wilt?

It is normal for cannabis clones to wilt initially after transplanting or cloning due to transplant shock. However, if the wilting persists, it may indicate an underlying issue such as over or under watering or nutrient deficiencies.

What causes clones to turn light green?

Clones can turn light green due to nutrient deficiencies, particularly nitrogen. Ensure that the clones have adequate nitrogen and other essential nutrients to prevent light green foliage.

How do I prevent burnt tips on cannabis clones?

Burnt tips on cannabis clones can occur due to nutrient burn from over-fertilization or pH imbalances. Ensure that the clones receive the appropriate amount of nutrients and maintain a proper pH balance to prevent burnt tips.

Remember to monitor your cannabis clones closely and address any issues promptly to ensure healthy growth and development.

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