Troubleshooting Common Microgreens Problems

Even experienced growers encounter problems with microgreens. Here's how to identify and fix the most common issues.

Problem 1: Mold Growth

Mold is one of the most common issues, especially in humid conditions. You'll see white, fuzzy growth on the soil or seeds.

Solutions:

• Improve air circulation with a small fan
• Reduce watering frequency - only mist when the surface feels dry
• Ensure proper drainage in your growing tray
• Use sterile growing medium
• Don't overcrowd seeds - give them space to breathe

Problem 2: Leggy or Stretched Growth

If your microgreens are tall and spindly with weak stems, they're not getting enough light.

Solutions:

• Move to a brighter location or add grow lights
• Keep lights 6-12 inches above the plants
• Provide 12-16 hours of light per day
• Rotate trays daily for even light exposure

Problem 3: Slow or No Germination

If seeds aren't sprouting, several factors could be at play.

Solutions:

• Check seed viability - old seeds may not germinate
• Ensure proper temperature (18-24°C is ideal)
• Some seeds need pre-soaking (check seed packet)
• Keep growing medium consistently moist but not waterlogged
• Ensure seeds have good contact with the growing medium

Problem 4: Yellowing Leaves

Yellow leaves can indicate nutrient deficiency or overwatering.

Solutions:

• Reduce watering frequency
• Ensure proper drainage
• Most microgreens don't need fertilizer, but if using soil, ensure it's nutrient-rich
• Check that pH is between 6.0-7.0

Problem 5: Damping Off

Seedlings collapse and die at the soil line - this is damping off disease.

Solutions:

• Use sterile growing medium
• Improve air circulation
• Don't overwater
• Start with clean containers and tools
• If it occurs, remove affected plants immediately

Prevention is Key

The best way to avoid problems is through proper setup: use clean containers, quality seeds, appropriate growing medium, and maintain consistent temperature and lighting. Most issues stem from overwatering or insufficient light, so get those basics right first!