Boost Your Microgreens Germination Rate: 5 Simple Tips for Success

Nothing is more frustrating than planting a fresh batch of microgreens seeds, only to watch most of them fail to sprout. Low germination rates can waste time, money, and space—especially when you're starting out. Fortunately, improving germination success doesn't require advanced equipment. Here are 5 actionable tips to help your microgreens get off to a strong start.

1. Choose High-Quality, Fresh Seeds

Old or low-quality seeds are the biggest cause of poor germination. For microgreens, use seeds that are less than one year old (ideally 6 months) from reputable suppliers. Avoid garden center mixes designed for full-growth plants—microgreens benefit from seeds with high viability and fast germination. Top performers include:

• Sunflower (95%+ germination rate)
• Radish (85–95%)
• Broccoli (75–90%)

2. Planting Depth Matters

Microgreens seeds come in different sizes, but they all need proper soil contact. The rule of thumb is: plant small seeds (like arugula) twice their thickness deep, and large seeds (like sunflower) three times their thickness. For example, peas should go about ¼" deep. Too deep? They may rot. Too shallow? They dry out quickly between sprays.

3. Keep the Right Balance of Moisture

Germinating seeds need consistent but not excessive moisture. Use a spray bottle to mist the soil gently 2–3 times daily, or pour water into the tray after planting. After the first sprouts appear, reduce watering to once per day. Avoid letting water pooling in the tray—soggy soil invites mold and rot. A quick fix: line your tray with a thin layer of vermiculite or perlite to help regulate moisture.

4. Maintain Ideal Temperatures

Most microgreens thrive in temperatures between 60–75°F (15–24°C). If your growing space is too cold, place the tray on a seedling heat mat (set to 75°F). Too hot? Move it to a shadier spot or use a fan to improve airflow. Temperature fluctuations are especially dangerous during the first 3 days after planting.

5. Test New Seeds Before Full Batches

To avoid wasting resources, perform a quick germination test:

1. Place 10 seeds on a damp paper towel
2. Seal in a plastic bag and store at room temperature
3. Check daily for 5 days

If at least 7 sprout reliably, your batch will likely succeed when planted. This works especially well with new seed types you haven't grown before.

Ready for Your Best Harvest Yet?

Improving germination is the first step toward growing dense, vibrant microgreens. Try one (or all) of these tips and watch your success rate climb. Remember, every grower learns through experimentation—what works for your sunflowers may surprise you when applied to mustard greens. Ready to optimize your method further? Share your own tricks in the comments below!