Growing Microgreens in Chennai and Tamil Nadu — How to Beat Humidity and Mould

✍️ Sonia Pardasani, Founder BageechaBox | 🕐 5 min read | 📍 Regional Guide

Quick answer: In Chennai and coastal Tamil Nadu, heat is manageable but humidity is the real challenge — it is the main cause of mould in microgreen trays. Sow at medium density, keep air moving with a small fan, bottom water sparingly, and choose warmth-loving varieties like radish, moong, methi, amaranth, sunflower and basil. October to December, when the northeast monsoon brings heavy rain, needs the most care.

Growers from Chennai often message us with the same photo: white fuzz on day four. Nine times out of ten it is not the seed — it is humid, still air. Once you set up your trays for Tamil Nadu's climate, microgreens grow beautifully there all year.

Your Growing Calendar

Season	Conditions	What to do
Jan – Feb	Warm and less humid	Best season — widest choice of varieties
Mar – Sep	Hot, humid	Grow indoors; focus on heat-tolerant varieties and airflow
Oct – Dec	Northeast monsoon, heavy rain	Highest mould risk — fan, medium density, careful watering

Growing in a cooler part of the state, like Coimbatore or the hills? You'll have more flexibility with cool-weather varieties.

Varieties That Suit Tamil Nadu

• Moong — likes warmth and is ready in 5–7 days, so it spends less time at risk
• Radish and China Rose radish — fast (6–8 days) and forgiving
• Methi — quick and perfect for South Indian cooking too
• Amaranth and basil — comfortable in warmth; sow sparingly (3–5g per tray)
• Sunflower — thick stems handle warm conditions well

Peas, broccoli, kale and spinach prefer cooler air. In Chennai, grow them in an AC room or in January–February.

Beating Humidity: Step by Step

Step 1 — Never oversow

Use medium-density quantities from our Seed Calculator and tick "Rainy or very humid". Crowded seeds trap moisture.

Step 2 — Run a small fan

Gentle, constant airflow is the single most effective fix. Point a small fan on low across the trays, not directly onto them.

Step 3 — Bottom water only when needed

In humid air, cocopeat stays wet for longer. Water only when the tray feels light, and never mist the leaves.

Step 4 — Know root hairs from mould

Fine white root hairs on the stems are normal. Grey, cobweb-like growth spreading across the medium is mould — see our fungus guide.

Step 5 — Protect your seed stock

Coastal humidity ages seeds quickly. Store opened packets airtight with silica gel — see seed storage.

Ordering Seeds to Tamil Nadu

Dry seeds travel well, so transit doesn't affect germination. Fresh-cut microgreens are delivered only in Delhi NCR.

Frequently Asked Questions

Q: Why do my microgreens get mould in Chennai?

Humid, still air combined with dense sowing and overwatering. Sow at medium density, run a small fan, and bottom water only when the tray feels light.

Q: Which microgreens grow best in Tamil Nadu?

Warmth-loving, fast varieties: moong, radish, China Rose radish, methi, amaranth, sunflower and basil.

Q: Can I grow microgreens during the northeast monsoon?

Yes, but it needs the most care. Grow indoors with a fan, sow less densely, and choose quick varieties that are ready in about a week.

Q: How long does delivery to Chennai take?

About 6–7 days for seeds, kits and supplies.