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Why are microgreens turning yellow?

Noticing yellowing leaves on your microgreens? It happens! This is a common issue, but the good news is there are often easy solutions. Let's explore the reasons behind yellowing and how to get your microgreen patch thriving again.

Understanding the Microgreen Ecosystem
Microgreens are like tiny athletes, needing specific conditions to thrive. Here are the key factors that could be causing yellowing leaves:

  1. Light: Just like any plant, microgreens need adequate light for photosynthesis. Insufficient light can lead to stunted growth and yellowing leaves.

Light Management: Blackout and Beyond
While microgreens require light for photosynthesis, there's a crucial stage during germination where darkness is key. This initial period called the blackout period, helps seeds focus their energy on root development. The optimal blackout period varies depending on the microgreen variety but typically ranges from 2-4 days.

After this initial darkness, introduce your microgreens to 6-8 hours of indirect sunlight daily. If natural light is limited, consider using LED grow lights specifically designed for indoor plants.

  1. Watering: Striking the right balance with water is crucial. Overwatering can cause root rot, leading to yellowing leaves and wilting. Conversely, underwatering can stress the plants, resulting in yellowing and stunted growth.
  1. Nutrients: While microgreens require minimal nutrients, a lack of essential minerals can lead to yellowing leaves. This is more likely in later growth stages (around 10 days) when the initial nutrients in the seed have been depleted.

Troubleshooting and Solutions
Now that we understand the potential causes, let's explore solutions:

  • Light: Ensure your microgreens receive 6-8 hours of indirect sunlight daily after the blackout period.
  • Watering: Aim for consistent moisture in the growing medium, but avoid leaving them soggy. A spray bottle can be a helpful tool for maintaining this balance.
  • Nutrients: For longer growth cycles (beyond 7-10 days), consider using a diluted organic fertilizer solution.

Prevention is Key
Here are some tips to prevent your microgreens from turning yellow in the first place:

  • Choose the Right Seeds: Select high-quality microgreen seeds from a reputable source.
  • Maintain Proper Temperature: Aim for a consistent temperature range between 60-70°F (15-21°C).
  • Good Air Circulation: Ensure proper air circulation around your microgreen trays to prevent moisture buildup and fungal diseases.
  • Harvest on Time: Don't wait too long to harvest! Overgrown microgreens are more prone to yellowing.

For more information:
Tel.: (646)-247-1783
Email: [email protected]

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