Do not mistake root hairs growing out of seeds with mold on microgreens.
Though both are white, mold looks like a long thread spread on microgreens, whereas root hairs are small roots with a beginning and an ending.
Mold on microgreens is a major concern, as it can cause financial loss if you’re a professional grower.
To avoid microgreen molding, you should first know what causes mold.
In short, mold starts to proliferate when it is exposed to a moist, warm, and stagnant environment. When the air is stagnant, mold colonizes and feeds on microgreens.
Overwatering, high density of seeds, and dirt in your tray can all attract mold.
Maintaining ideal humidity and choosing the best seeds can quickly reduce the chances of mold on microgreens.
Before we delve deeper, let’s first understand the growing conditions of microgreens.
What are Microgreens?
Microgreens are young plants harvested when they reach just a few inches tall. Packed with nutrients and intense flavor, Chef Craig Hartman first coined the term.
Each microgreen has a particular flavor, which makes them distinct.
Check this out: Do Microgreens Regrow After Cutting?
Nutritional Benefits
Microgreens gained popularity for higher amounts of vitamins, minerals, and antioxidants compared to their mature counterparts.
For instance, red cabbage microgreens can have up to 40 times more vitamin E and six times more vitamin C than mature red cabbage.
Popular Varieties
There are numerous varieties of microgreens, each with its unique taste and nutritional profile. Some popular types include:
- Arugula: Known for its peppery flavor.
- Radish: Spicy and crunchy.
- Sunflower: Nutty and crisp.
- Pea Shoots: Sweet and tender.
- Basil: Aromatic and fresh.
Also Read: How to Grow Microgreens Indoors?
Growing Conditions for Microgreens
Whether you’re growing microgreens for personal use or commercial purposes, it is essential to understand the optimal growing conditions to prevent mold and ensure a healthy crop.
Light Requirements
Natural sunlight coming from your window will be enough to grow microgreens.
However, you may have to use artificial lights depending on climatic conditions in your region.
Also, few species need to be grown in dark environments.
Temperature and Humidity
Microgreens prefer a temperature range of 60-70°F (15-21°C) and a humidity level of around 50-60%.
Too much humidity can create a breeding ground for mold, while too little can dry out the plants and hinder their growth.
Soil and Watering
Choosing the proper growing medium is essential, as the medium’s capacity to hold moisture and the frequency of watering can influence the nutrients in the microgreens.
Using a well-draining, sterile growing medium is essential. Overwatering is one of the primary causes of mold, so it’s important to keep the soil consistently moist but not waterlogged.
Watering from the bottom is an excellent technique to prevent excess moisture on the leaves and stems.
What Causes Mold on Microgreens?
Remember that mold isn’t bad in itself. It is an essential part of the cycle of life, as it helps to break down natural minerals.
So, mold is in the atmosphere and isn’t problematic until it starts to proliferate.
Unfavorable conditions like humid, warm, and stagnant air allow mold to colonize and rot microgreens.
Knowing what triggers mold to multiply is essential. Several factors can cause this, and identifying them can help in taking preventive measures.
Also Read: How to Grow Radish Microgreens at Home?
How Humidity Contributes to Mold Growth
Mold spores are always present in the environment, but they require certain conditions to grow and multiply.
High humidity provides the moisture that mold spores need to germinate and spread.
When humidity levels are high, the air is saturated with moisture, which can condense on the surface of microgreens, creating a damp environment.
Overwatering
Excessive moisture is the most common cause of mold. Overwatering creates a damp environment that is perfect for mold growth.
It’s essential to water microgreens sparingly and ensure proper drainage.
Poor Air Circulation
Stagnant air can lead to mold growth. Without adequate air circulation, moisture can linger on the plants, creating an ideal environment for mold spores to thrive.
Using fans or growing microgreens in a well-ventilated area can help improve airflow.
High Seed Density
Planting seeds too densely can lead to overcrowding, which increases the risk of mold.
When plants are too close together, there is less air circulation and more competition for nutrients and water. It’s essential to follow the recommended seeding rates for each type of microgreen.
Contaminated Growing Medium
Using contaminated or unsterilized soil can introduce mold spores into your growing environment. To minimize the risk of mold, it is essential to use a sterile, high-quality growing medium.
Inadequate Light
Insufficient light can weaken microgreens and make them more susceptible to mold. Ensure that your microgreens receive adequate light to stay healthy and strong.
Check this: How to Grow Beet Microgreens?
How to Prevent Mold on Microgreens?
Preventing mold requires a proactive approach. Here are some strategies to keep mold at bay:
1. Proper Watering Techniques
- Bottom Watering: Watering from the bottom can help prevent excess moisture on the leaves and stems. Fill a tray with water and place the microgreen tray on top, allowing the soil to absorb moisture from below.
- Monitor Soil Moisture: Check the moisture level of the soil regularly and water only when necessary. The soil should be kept moist but not soggy.
2. Improving Air Circulation
- Use Fans: Place small fans near your growing area to enhance airflow. This helps to reduce humidity and dry out any excess moisture on the plants.
- Spacing: Properly space seeds to avoid overcrowding. This ensures better air circulation and reduces the risk of mold.
3. Sterilizing Growing Medium
- Use Sterile Soil: Always use a sterile, high-quality growing medium. Avoid using garden soil, which can contain mold spores and other pathogens.
- Pre-treat Seeds: Some growers pre-treat seeds with a hydrogen peroxide solution to kill any potential mold spores.
4. Managing Humidity and Temperature
- Dehumidifiers: Use a dehumidifier in your growing area to control humidity levels, especially in humid climates.
- Temperature Control: Maintain an optimal temperature range to prevent excessive humidity and create a less favorable environment for mold growth.
5. Ensuring Adequate Light
- Grow Lights: If natural sunlight is insufficient, use full-spectrum grow lights. Ensure that microgreens receive 12-16 hours of light per day.
- Rotate Trays: Rotate your trays regularly to ensure even light distribution and prevent weak, leggy growth.
Important Tips While Growing Microgreens
In addition to preventing mold, here are some general tips to ensure a successful microgreen harvest:
- Clean Equipment: Always clean and sterilize your trays, tools, and other equipment before use to prevent contamination.
- Quality Seeds: Use high-quality seeds from reputable suppliers. Some seeds are treated to resist mold and other pathogens.
- Monitor Growth: Regularly inspect your microgreens for any signs of mold or disease. Early detection can help prevent the spread.
- Harvest Time: Harvest microgreens when they reach the desired height, typically 7-14 days after germination. Delaying harvest can increase the risk of mold.
- Storage: Store harvested microgreens in a cool, dry place. Proper storage can extend their shelf life and maintain freshness.
Conclusion
Maintaining ideal humidity, improving air circulation, and practicing proper gardening techniques are ways to prevent mold on microgreens.
By understanding the causes of mold and implementing preventive measures, you can ensure a healthy and abundant microgreen harvest.
Remember to monitor your plants regularly, maintain optimal growing conditions, and take immediate action at the first sign of mold.
With these strategies, you can enjoy the nutritional benefits and unique flavours of microgreens without the worry of mold ruining your crop.
