When to sow coriander at home in India

Coriander (dhania) is one of the most-grown herbs on Indian terraces and balconies, and also one of the most frustrating when it fails to germinate or bolts within days of coming up. The most common reason for both problems is sowing at the wrong time of year. The right sowing window in India depends heavily on where you live — a grower in Lucknow and a grower in Bengaluru are dealing with very different temperatures and humidity levels, even in the same calendar month. This guide covers when to sow coriander at home in India, city by city, along with the temperature thresholds that matter, tips for succession sowing so you always have leaves to harvest, and why monsoon sowing is almost always a waste of seeds.

Whether you are growing in a 12-inch pot on a Delhi balcony, a grow bag on a Hyderabad terrace, or a window box in Shimla, the timing advice in this guide applies directly to your setup.

Why temperature is the single biggest factor

Before looking at city-specific calendars, it helps to understand what coriander seeds actually need to germinate.

Coriander germinates best when soil temperature is between 15°C and 22°C. Within this range, seeds typically sprout in 7–14 days. Outside this band, results drop off sharply:

Below 10°C: germination slows dramatically. Seeds may take 3–4 weeks or fail entirely. In North India hill stations like Shimla, early November sowing can stall for this reason.
Above 28°C: germination rate falls to very low levels. Even seeds that do sprout tend to bolt (go to seed without forming a proper leaf canopy) within 2–3 weeks. This is what most people are experiencing when they say "my coriander keeps bolting."
Above 35°C: at typical Indian summer temperatures in plains cities, germination is essentially unreliable. Do not sow.

This temperature sensitivity explains every timing recommendation in this guide. You are not following a calendar for its own sake — you are following the temperature curve of your city.

A useful practical test: if you can hold the back of your hand on the surface of the pot for 30 seconds without discomfort, the soil temperature is probably within range. If the pot feels hot to the touch, wait.

North India: Lucknow, Delhi, Agra, Kanpur, Jaipur

North India has the clearest coriander-growing season in the country because the rabi (winter) months bring temperatures that sit almost perfectly in the 15–22°C germination window.

Best sowing window: October to February

October: Soil is cooling after summer but daytime highs are still 28–32°C in early October. Wait until the second half of the month when daytime temperatures drop below 30°C reliably. Late September can work as an early trial if that year's September is cooler than usual — check your local weather app rather than relying on averages.
November–December: Prime time. Daytime temperatures in Delhi and Lucknow are typically 18–25°C, nights around 10–15°C. Germination is fast and seedlings are sturdy. This is when most experienced terrace gardeners make their first and largest sowing.
January: Still good. Daytime highs of 16–22°C in most North Indian cities. Night temperatures can dip to 5–8°C in January in Delhi, Agra, and Lucknow — if a cold wave brings temperatures near or below 5°C, germination will stall. Consider moving pots indoors or under a covered balcony during cold snaps.
February: The tail end of the prime window. Temperatures are rising from mid-February. You can still get a harvest but the plant will bolt earlier — factor in 2–3 weeks less leaf harvest time compared to a November sowing.
March onward: Temperatures climb past 28°C reliably in most North Indian plains cities from March. Germination is unreliable and bolting is fast. Not recommended.

Succession sowing tip: In October through January, sow a new small pot or container every 3 weeks. This staggers germination and harvest so you always have young leaves coming up as the older sowing starts to bolt.

South India: Bengaluru, Chennai, Hyderabad, Kochi

South India has milder winters than the north, which means coriander can be grown over a longer window — but the summer heat arrives earlier and is less extreme than in North India plains, and some south Indian cities have two distinct rainy seasons.

Best sowing window: October to March (and year-round in some microclimates)

Bengaluru: The city's elevation (about 900 m) keeps temperatures relatively stable. Daytime temperatures from October to March range between 20°C and 28°C — close to ideal. Many Bengaluru terrace growers report year-round success in shaded spots on east-facing balconies, where the plant gets morning sun but is protected from afternoon heat. Even April and May can work on a shaded balcony where air temperature stays below 28°C.
Chennai: Summers are harsh (38–42°C in April–May), and the northeast monsoon (October–December) brings heavy rain that can cause damping off. The practical window is January to March and again July to September between rain events. In January–February, Chennai temperatures are around 22–28°C — on the warm side but workable if the pot is kept on an east-facing terrace.
Hyderabad: Similar to Bengaluru with slightly hotter summers. October through February is comfortable for coriander. March can work in a shaded spot. Avoid April through June.
Kochi and coastal Kerala: High humidity year-round makes coriander tricky — humidity above 80% encourages damping off. The most reliable window is November to February during the break between the southwest and northeast monsoons. Use well-draining cocopeat-heavy mix and do not overhead water.

Year-round in Bengaluru: If you have a shaded east-facing spot that stays below 26°C, you can sow year-round in Bengaluru. Use fresh seeds for each batch and accept that summer sowings have lower germination rates (50–60% versus 80–90% in winter).

Central India: Bhopal, Nagpur, Indore, Raipur

Central India summers are intense and arrive early. Coriander growing is firmly a short-season winter activity in these cities.

Best sowing window: October to January

October: Second half of October is safe when temperatures drop below 32°C. First half can still be 34–36°C in Nagpur and Bhopal — too hot.
November–December: Best months. Daytime highs of 22–28°C, nights around 12–16°C. Germination is reliable and plants grow well in this window.
January: Still workable but temperatures start climbing from the second half. Expect plants to bolt by late February.
February onward: Temperatures in Nagpur and Bhopal climb steeply in February. By March, daytime highs exceed 32°C routinely. Not suitable.

The window is shorter here than in North India because warming comes earlier. Prioritise your first sowing in mid-October and make succession sowings in November and early December.

Mountain regions: Shimla, Nainital, Mussoorie, Darjeeling

The hills follow the opposite calendar to the plains. When plains growers are happily harvesting coriander in December, hill growers are dealing with sub-5°C temperatures that make germination nearly impossible.

Best sowing window: April to September

April–May: As temperatures start to rise from winter lows, soil temperatures in Shimla and Nainital approach 12–15°C. Late April is a reasonable time to start, though germination will be slower than at 18°C.
June–July: Daytime temperatures of 18–22°C are ideal. This is peak coriander season in the hills. The early monsoon (June–July) brings humidity — use a sheltered spot to avoid waterlogging.
August–September: Good growing temperatures persist. This aligns with when plains growers are struggling with monsoon humidity. If you have covered terrace space in a hill town, this is excellent growing time.
October onward: Temperatures start falling. By November, highs drop below 12°C and frost risk increases. Wrap up your last harvest before November.

Hill-station growers: use shallow pots (20–25 cm depth) that warm up faster in spring. Black or dark-coloured containers absorb more heat and help push soil temperature up in April–May when ambient air is still cool.

Monsoon sowing: why it almost always fails

Across all regions of India, the southwest monsoon (June–September) makes coriander sowing unreliable to the point of being not worth attempting in most situations.

The main problem is damping off — a fungal disease caused by Pythium and Rhizoctonia species that thrives in warm, wet, humid conditions. Freshly germinated coriander seedlings are extremely susceptible. When it rains for days at a stretch and humidity stays above 80%, seedlings collapse at the soil line and die within 48–72 hours of sprouting.

Secondary problems:

High monsoon temperatures in plains cities (30–35°C) push soil temperatures above the germination ceiling.
Waterlogged growing mix suffocates seeds before they can sprout.
Fungal gnats and other soil pests peak during monsoon, attacking tender seedlings.

Exception: if you have a fully covered terrace or a sheltered indoor window with 4–6 hours of indirect light, you can attempt monsoon sowing with a sterile seed-starting mix (cocopeat + perlite, no garden soil) and very careful watering. Success rates are lower but it is possible with the right setup.

For most growers on open terraces and balconies: skip monsoon sowing entirely and start again in October.

How to prepare seeds before sowing

One simple step dramatically improves germination rates: pre-soak seeds for 8 hours before sowing.

Coriander seeds are technically a dried fruit containing two seeds. The outer hull can inhibit germination. Soaking softens the hull and kick-starts the germination process.

How to do it:

Lightly crush each seed between your fingers or roll them on a hard surface under a flat palm. This splits the hull gently without damaging the seed inside. You want two roughly equal halves.
Soak the split seeds in room-temperature water for 8 hours (overnight works well).
Drain and sow immediately — do not let soaked seeds dry out.

This one step can push germination rates from 50–60% up to 80–85% and cut germination time from 14 days to 7–10 days.

Growing mix for containers: use a well-draining mix of 50% cocopeat, 30% vermicompost, and 20% perlite or coarse sand. Avoid heavy garden soil in pots — it compacts, drains poorly, and harbours fungal pathogens. A handful of neem cake in the mix helps suppress soil-borne fungal issues during the early germination phase.

Succession sowing for a continuous harvest

The biggest mistake terrace coriander growers make is treating it as a single sowing. Coriander's leaf harvest window is short — typically 3–5 weeks from when you first cut leaves to when the plant bolts. After bolting, leaves become small, sparse, and bitter.

Succession sowing solves this by staggering plantings so a new batch is always coming up as the old one finishes.

A simple system that works on a standard balcony:

Use 4–6 containers of 8–12 inches diameter (or one long trough divided into sections).
Sow a new container every 3 weeks through the growing season.
Harvest the oldest container when it starts to bolt, then clean it out and sow the next batch.
At any point in the season you have containers at different stages: germinating, leafy, about to bolt.

This approach uses the same total space but gives you 3–4× more leaf harvest than a single large sowing. In Lucknow or Delhi, a succession plan starting in late October can keep you in fresh coriander through February — nearly four months of continuous harvest from the same set of pots.

Label each pot with the sowing date using a permanent marker on masking tape. It makes it easy to know which pot is next in rotation.

Container and variety tips for Indian terrace growers

Container size: coriander is a relatively shallow-rooted herb. A container 8–10 cm deep is technically sufficient for leaf harvests, but 15–20 cm depth gives more growing medium, better moisture retention, and room for roots to grow without competing. Wide, shallow troughs work well and allow dense sowing.

Varieties suited to Indian terrace conditions:

Swathi and Sindhu: bred for warm conditions, slower to bolt than common unselected varieties. Available from most Indian seed suppliers.
CO 4: a popular South Indian variety, good for Bengaluru and Hyderabad terrace growers.
Rajendra Swati: performs well in North Indian rabi conditions.
Common coriander from the kitchen spice rack can be used (split and soak as described above) but bolts faster than garden varieties.

Grow bags: 12×12-inch or 14×14-inch grow bags work well for coriander. Grow bags have better drainage and airflow than rigid plastic pots, which reduces damping-off risk — a useful advantage during October when humidity is still elevated in many cities. A standard grow bag sized for coriander costs ₹30–60 from most garden supply shops or online.

Fertilising and watering through the season

Coriander grown for leaves needs moderate nitrogen and does not need heavy feeding.

Watering: keep the mix consistently moist but never waterlogged. In winter, one watering per day (morning) is usually sufficient for containers on a sunny terrace. In November–December when temperatures are mild, let the top 1 cm of mix dry slightly before watering again. Overwatering is a more common problem than underwatering for terrace coriander.

Fertilising: a dilute liquid feed every 2 weeks is enough. Options:

Jeevamrit diluted 1:10 in water — apply as a drench.
Panchagavya diluted 3% (3 ml per litre) — spray on leaves or drench soil.
A balanced liquid organic fertiliser (N:P:K roughly 3:1:1) at half the recommended rate.

Avoid heavy nitrogen feeds — they push leafy growth but also accelerate bolting. Steady, moderate feeding gives better results than occasional heavy doses.

Frequently asked questions

Can I sow coriander in April or May in Delhi?

April and May in Delhi see daytime temperatures of 38–44°C, which is far above coriander's germination ceiling of 28°C. Germination rates will be very poor and any seedlings that do emerge will bolt almost immediately. Wait until late October when temperatures drop back below 30°C reliably. If you are determined to grow coriander in summer, a fully shaded north-facing spot or indoor window with grow lights is the only realistic option, and even then, expect much lower success rates than a winter sowing.

My coriander always bolts within 2 weeks of germinating. What am I doing wrong?

Bolting this fast almost always means the soil temperature during germination was too high — above 28°C. The plant senses heat stress immediately after germinating and accelerates its lifecycle to produce seeds before it dies. Check the time of year you are sowing and, if necessary, delay until temperatures cool. A second cause is using old seeds from the previous year — old coriander seeds have much higher bolting rates. Use fresh seeds each season. See why is my coriander bolting? for a full breakdown.

Is it true coriander cannot be transplanted?

Yes. Coriander has a delicate taproot that does not survive disturbance well. Always sow directly into the final container — scatter seeds thinly over the surface, press them in gently, and thin seedlings to 5 cm apart once they are 3–4 cm tall. Do not start in a seedling tray and transplant. The thinned seedlings can be eaten as microgreens rather than discarding them.

How many seeds should I sow per pot?

For a 12-inch pot, scatter 20–30 split seeds evenly over the surface and cover with a thin layer of cocopeat (3–5 mm). Once seedlings reach 3–4 cm, thin to one seedling every 5 cm. This density gives good yield without the plants competing too aggressively. Dense sowing without thinning produces weak, leggy plants that bolt faster.

Can I grow coriander indoors without direct sunlight?

Coriander needs a minimum of 4–5 hours of bright indirect light or direct morning sun. A north-facing window in India typically does not provide enough light — the plant will become leggy and pale. An east-facing window with direct morning sun is the minimum for reasonable indoor results. South and west-facing windows work well but can become too hot in summer. If you have only a north-facing window, a basic grow light (a 45W LED full-spectrum panel costs ₹800–1,500 online) run for 12–14 hours per day gives usable results.

How long after sowing can I start harvesting?

With good germination conditions (soil temperature 18–22°C, pre-soaked seeds), seedlings appear in 7–10 days. You can make a first small cut of young leaves at 3–4 weeks after sowing, when plants are 8–10 cm tall. For a fuller harvest, wait until 5–6 weeks when the canopy is dense. Always cut the outer leaves first and leave the growing centre intact — this extends your harvest window by 2–3 weeks before the plant bolts. Once you see a thin, upright flower stalk emerging from the centre, the plant is bolting and leaf quality will drop quickly.

Got a plant problem? Use the free Plant Doctor →

Need expert advice? Book a certified agronomist →