Troubleshooting Why Plants Die Under Grow Lights in 2023!

Written by Linus Li


Posted on June 15 2023


  1. Common Reasons for Plant Death Under Grow Lights
  2. Troubleshooting Insufficient or Excessive Light
  3. Troubleshooting Temperature and Humidity Issues
  4. Troubleshooting Poor Air Circulation
  5. Troubleshooting Watering and Nutrient Issues
  6. Troubleshooting Pests and Diseases
  7. Conclusion

Indoor gardening has become increasingly popular, and grow lights are an essential tool for providing plants the light they need to thrive. However, even with the use of grow lights, plants may struggle or die. In this comprehensive guide, we'll explore common reasons why plants die under grow lights and share tips on how to troubleshoot and revive them.


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Common Reasons for Plant Death Under Grow Lights

There are several factors that can contribute to plant death under grow lights. For an in-depth look at these issues, check out this helpful blog post on Raised Garden Bed Health & Prevention Best Practices ↗. Here's a brief overview of the common reasons:

  • Insufficient light intensity
  • Excessive light intensity or duration
  • Incorrect light spectrum
  • Inadequate temperature and humidity control
  • Poor air circulation
  • Overwatering or underwatering
  • Nutrient deficiency or toxicity
  • Pests and diseases

Troubleshooting Insufficient or Excessive Light

Assessing Your Plant's Light Requirements

Different plants have varied light requirements ↗ depending on their type and growth stage. Research your plant's specific needs to determine the optimal light intensity and duration.

Adjusting Light Distance and Duration

If your plants show signs of light stress, adjust the distance between the grow light and the plants, or alter the duration of light exposure. Remember to make gradual adjustments and monitor the plants' response.

Monitoring Plant Response to Light Adjustments

Observe your plants for signs of improvement or further stress after making adjustments. Look for changes in leaf color, new growth, and overall plant health.

Using Light Meters for Accurate Measurement

A light meter ↗ can help you measure the light intensity at your plants' canopy level, ensuring they receive the right amount of light for their needs.

Troubleshooting Temperature and Humidity Issues

Ideal Temperature and Humidity Ranges for Different Plants

Each plant species has its own preferred temperature and humidity range. Research your plant's requirements and strive to maintain those conditions in your growing space.

Using Heaters, Coolers, Humidifiers, and Dehumidifiers

Maintain optimal temperature and humidity levels by using heaters, air conditioners, humidifiers, and dehumidifiers as needed. Monitor conditions with a digital hygrometer ↗ and adjust your equipment accordingly.

Monitoring and Adjusting Temperature and Humidity Levels

Regularly check temperature and humidity levels to ensure they fall within the desired range for your plants. Make adjustments as necessary to keep your growing environment stable.


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Troubleshooting Poor Air Circulation

Importance of Air Circulation for Plant Health

Proper air circulation is crucial for plant health, as it helps prevent diseases, strengthens stems, and aids in nutrient uptake. Lack of air circulation can lead to stagnant air and an unhealthy environment for your plants.

Proper Placement and Spacing of Plants

Ensure your plants have enough space between them to promote good air circulation. Overcrowding can lead to poor airflow and increased risk of disease.

Using Fans and Ventilation Systems

Incorporate fans and ventilation systems in your growing space to maintain proper air circulation. Ensure they are appropriately sized and positioned for optimal airflow.

Troubleshooting Watering and Nutrient Issues

Signs of Overwatering and Underwatering

Overwatering can lead to root rot, while underwatering can cause wilting and stunted growth. Learn to recognize the signs of both and adjust your watering practices accordingly.

Proper Watering Techniques for Indoor Plants

Water your plants based on their specific needs, taking factors like pot size, soil type, and humidity into account. Ensure proper drainage to prevent waterlogged soil.

Identifying and Correcting Nutrient Deficiencies or Toxicities

Nutrient imbalances can cause a variety of symptoms, such as yellowing leaves or stunted growth. Research your plant's nutrient needs and use appropriate fertilizers to maintain a balanced nutrient profile.

Choosing the Right Soil and Fertilizers

Select a high-quality soil mix and fertilizers tailored to your plant's needs. Organic options can provide slow-release nutrients and promote healthy soil microbes.


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Troubleshooting Pests and Diseases

Common Pests and Diseases Affecting Indoor Plants

Indoor plants can still be affected by pests and diseases. Common indoor plant pests include aphids, spider mites, and fungus gnats, while diseases may include root rot, powdery mildew, and damping off.

Prevention and Treatment Strategies

Implement prevention strategies, such as regular inspections,proper sanitation, and good cultural practices. If pests or diseases do appear, use targeted treatments like insecticidal soap, neem oil, or fungicides to manage the problem.

Using Integrated Pest Management (IPM) Techniques

Adopt an Integrated Pest Management (IPM) ↗ approach to manage pests and diseases effectively. This includes monitoring, prevention, and targeted control methods that minimize the use of harmful chemicals.


Understanding the common issues that can cause plants to die under grow lights is essential for successful indoor gardening. By monitoring and adjusting light, temperature, humidity, air circulation, watering, and nutrient levels, you can create a healthy environment for your plants to thrive. As you gain experience, you'll become more adept at recognizing and addressing problems, leading to a lush and vibrant indoor garden.

Share your thoughts or experiences in the comments section below or on social media, and let's learn together to become better indoor gardeners!

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