Microgreens might be small, but they’re seriously mighty. These tiny greens are harvested just after their first leaves (called cotyledons) pop out and they pack up to 40 times the nutrients of their mature plant versions. Amazing, right?
But as nutrient-dense and flavor-filled as they are, microgreens can get expensive fast. That’s why so many home growers (like you!) are rolling up their sleeves and growing their own. Before you start planting, let’s talk about the unsung hero of your setup: soil.
Can’t I Just Use Garden Soil?
Here’s why:
- Garden soil compacts when spread in trays, which cuts off airflow to roots. Think: concrete slab.
- It’s often full of weed seeds, pests, and fungus spores, a nightmare for delicate microgreens. Plus bringing that indoors? Ew.
- It lacks the light texture and drainage that microgreens need for quick, healthy growth.
Instead? Choose a sterile, seedling-friendly soil mix. Your greens will thank you.
Seedling Mix vs. Potting Soil: What’s the Difference?
Both are great options, it just depends on how fast your microgreens grow and how much nutrition they need along the way.
Seedling Mix
- Best for fast-growers like radishes, mustard, bok choy, and lettuce.
- Light, fluffy, and just nutrient-rich enough for short 1–2 week growing cycles.
- Helps microgreens anchor their roots and build resilience.
Potting Soil
- A bit more robust, great for greens that take 2–3 weeks to mature.
- Contains extra nutrients to sustain growth beyond the sprouting phase.
- Pro tip: Layer potting soil on the bottom and seedling mix on top for a win-win blend.
Growing a slower variety that takes 4+ weeks? You might want to add a touch of organic fertilizer for an extra boost.
Tips for Soil Success
Ready to get your hands dirty (but, like, in a good way)? Here are our favorite tricks:
- Start small. Buy small bags of different soils to test what works best in your space.
- Go organic (carefully). Read the label to make sure it’s safe for food-growing.
- Moisture matters. Before planting, moisten your soil until it feels like a wrung-out sponge…damp, not soggy.
- Don’t over-fertilize. Most microgreens grow just fine without added nutrients.
- Experiment! Try different blends and see what your greens love most.
Final Sprout Thoughts
Soil isn’t just dirt, it’s the foundation of your microgreen success. While it’s easy to focus on seeds and trays, the right soil can make or break your harvest. Luckily, microgreens grow fast, so you’ve got plenty of chances to experiment and find your perfect mix.
