Introduction: Do Microgreens Really Need Fertiliser?
Microgreens are known for their quick growth cycle, vibrant colours, and high nutrition — all within a span of 7–14 days. Since they grow so fast, many beginners wonder if organic fertilisers for microgreens are even necessary.
The short answer? Not always — but sometimes they can make a big difference.
Let’s explore when fertilisers are useful, which organic options work best, and how to ensure your greens stay healthy, tasty, and chemical-free.
🌿 Do Microgreens Require Fertilisers?
Microgreens don’t need as much nutrition as fully grown plants because they rely heavily on the nutrients already stored in their seeds. However, certain factors can affect their growth and quality:
Poor-quality or reused soil may lack essential nutrients.
Longer-growing varieties like sunflower, pea shoots, or beet may need extra nutrition.
Hydroponic systems (growing without soil) may require added minerals through liquid organic fertilisers.
So, while most beginners can grow microgreens without any fertiliser, using the right natural fertilisers can enhance growth, improve flavour, and increase yield.
🌾 Benefits of Using Organic Fertilisers for Microgreens
Using organic fertilisers offers multiple benefits that synthetic alternatives cannot match:
✅ 1. Improved Growth and Colour
Organic fertilisers slowly release nutrients, helping your microgreens grow stronger roots and maintain rich green colour.
✅ 2. Enhanced Flavour and Aroma
Since natural fertilisers feed the soil, not just the plant, the microgreens absorb balanced nutrients, which leads to better flavour and aroma.
✅ 3. Healthier and Safer Harvest
Chemical-based fertilisers can leave residue on delicate greens. Organic options are 100% safe for consumption, especially since microgreens are eaten raw.
✅ 4. Sustainable and Eco-friendly
Using compost-based or liquid organic fertilisers supports a more sustainable growing process, keeping your setup environmentally friendly.
🌱 Best Organic Fertilisers for Microgreens
Here are some of the most effective and beginner-friendly organic fertilisers you can use:
1. Compost Tea
A mild liquid made by soaking compost in water for 24–48 hours.
Adds beneficial microbes and nutrients to the soil.
Use it as a light spray on soil before sowing or during growth.
Tip: Avoid over-saturating the soil to prevent mould formation.
2. Vermicompost (Worm Castings)
A nutrient-rich soil additive made by earthworms.
Improves soil structure and microbial health.
Excellent for boosting root strength and seedling vitality.
Mix 10–20% vermicompost into your potting mix before sowing seeds.
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3. Seaweed Extract
A liquid fertiliser packed with trace minerals and natural growth hormones.
Encourages lush, even growth.
Great for hydroponic microgreens or tray-grown setups.
How to use: Dilute as per instructions and apply once a week as a gentle foliar spray.
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4. Cow Dung Compost
Traditional Indian gardeners swear by this natural fertiliser.
Provides nitrogen, phosphorus, and potassium — all essential for healthy greens.
Adds long-lasting organic matter to the soil.
Note: Make sure it’s fully decomposed before use to avoid odour and harmful bacteria.
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5. Banana Peel Fertiliser
A DIY-friendly potassium booster.
Supports leaf development and improves plant resilience.
Can be made by soaking banana peels in water for 2–3 days.
Spray the diluted liquid once during mid-growth.
🌼 When to Use Organic Fertilisers for Microgreens
Microgreens usually grow fast enough without much help, but you may consider fertilising when:
You’re reusing soil trays multiple times.
Plants appear pale, weak, or stunted.
You’re growing longer-cycle microgreens (pea shoots, sunflower, beet).
You’re using hydroponic methods without soil nutrients.
Remember — less is more. Microgreens are delicate, so it’s better to apply a mild, diluted solution rather than risk over-fertilising.
🌞 Organic Fertiliser Tips for Beginners
Always dilute liquid fertilisers to half or one-third strength.
Use filtered or RO water to prevent salt build-up.
Avoid spraying fertiliser directly on leaves during peak sunlight hours.
Maintain proper air circulation to avoid mould.
🌿 Fertiliser-Free Microgreens That Still Thrive
If you prefer growing naturally without any added inputs, these varieties usually perform beautifully in basic potting soil:
Radish microgreens
Fenugreek (methi) microgreens
Mustard microgreens
Coriander microgreens
Wheatgrass
They grow fast, require minimal care, and deliver strong flavour and nutrition even without added fertilisers.
Final Thoughts
Using organic fertilisers for microgreens isn’t always necessary — but it can make a noticeable difference when your goal is better yield, stronger growth, and richer flavour.
If you’re just starting, try growing your first few trays without fertiliser. Then, experiment with mild organic options like vermicompost or seaweed extract to see how your greens respond.
By balancing the right soil mix, moisture, and organic nutrition, you’ll enjoy vibrant, flavourful microgreens that truly live up to their superfood status — fresh, natural, and chemical-free.
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