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Understanding and Managing Bolting in Plants

Identifying Causes and Solutions for Flowering and Bolting in Hydroponic Plants

Overview 

Flowering and bolting in plants are often indicators of plant stress, primarily triggered by unfavorable climate conditions. High humidity, elevated temperatures, and insufficient vapor pressure deficit (VPD) levels are common contributors to this stress, leading to undesirable changes in plant growth and flavor. 

Impact of Flowering and Bolting 

When plants flower or bolt, they typically develop a bitter flavor and decrease in consumer appeal. Additionally, the presence of numerous small leaves resulting from bolting increases labor time during harvest without necessarily enhancing yield. 

Action Steps for Flowering and Bolting 

  1. Immediate Actions
    1. Remove Flowers: Where possible, remove whole flowers from the plants. 
    2. Discard Affected Plants: Consider discarding plants that have flowered and bolted to maintain crop quality. 
  2. Information Gathering

To effectively diagnose the issue, please provide detailed information and photos when communicating with a Growcer technician. The following questions will help collect necessary data to resolve your issue. 

Assessment Questions 

  1. Location of the Issue: 
    1. Where in the system did the issue occur? 
  2. Cultivar Impact: 
    1. How many cultivars were affected? Was it just one cultivar, or does the issue extend to others? Please include photos. 
  3. Extent of Impact: 
    1. What percentage of the plants were impacted? 
  4. Root and Shoot Assessment: 
    1. Were the roots and shoots affected? Include photos for reference. 
  5. Environmental Conditions: 
    1. What are the temperature and humidity levels? Have there been any noticeable dips or spikes? 
  6. Light Schedules: 
    1. Confirm that light schedules have not changed recently. 
  7. HVAC and VAF System Status: 
    1. Confirm that HVAC and VAF systems are operating effectively. 
    2. Ensure that HVAC supply air and return air ducts/grills are not blocked. 
  8. Plant Age: 
    1. Gather information on plant age to assess the severity of the issue. Older plants are more likely to flower even in good environmental conditions. 
  9. Growth Practices: 
    1. Are the customers following the correct growth schedules? Are they pruning properly? For example, basil plants may bolt if they become too tall or old. 
  10. Existing System Issues: 
    1. Are there any pre-existing system issues that should be noted? 

Communication and Follow-Up 

Always inform Growcer support about the situation. For further assistance, contact help@thegrowcer.ca. 

Conclusion 

By systematically gathering information and addressing the contributing factors to flowering and bolting, you can manage these issues effectively and maintain the health and quality of your plants.