How to grow spring onion at home
Spring onion — called hara pyaaz in Hindi, or scallion if you follow Western cookbooks — is one of the most practical vegetables you can grow on an Indian terrace or balcony. A single wide tray planted in October will keep producing crisp green stalks right through February, and the cut-and-come method means the same tray regrows two or three times after each harvest without any fresh sowing. If you have ever bought a bunch of hara pyaaz from the sabzi mandi and wondered whether the roots could be planted back, the answer is yes — that is actually one of the three methods this guide covers.
Spring onions are particularly well suited to container gardening because they grow in shallow soil, tolerate mild crowding, and need almost no fertiliser beyond a single light feed at sowing time. A 12–15 cm deep tray on a Lucknow, Delhi, Kanpur, or Jaipur balcony between October and March will give you mild-flavoured, tender stalks ideal for salads, garnishes, parathas, and Indo-Chinese cooking. In Mumbai and Bengaluru, where winters stay above 15°C, you can extend that window slightly.
This guide covers three growing methods (from seeds, from regrown mandi roots, and from sets), the right container and soil mix, watering and feeding, the cut-and-come harvest technique, and the two problems — rust and thrips — that most commonly affect spring onions at home.
Three methods to grow spring onion at home
One of the reasons hara pyaaz is so popular with beginners is that you can start growing it in multiple ways depending on what you already have. Each method has a different time to first harvest, a different cost, and a different level of effort.
Method 1: From seeds
Seeds give you the most control over variety, timing, and density. The easiest approach for containers is dense broadcast sowing — scatter seeds evenly across the surface of a wide tray rather than making individual rows.
How to do it:
- Fill a wide, shallow tray (at least 30 cm × 20 cm, 12–15 cm deep) with your prepared soil mix (see the container and soil section below).
- Water the soil the night before sowing so it is thoroughly moist but not waterlogged.
- Scatter seeds densely across the surface — roughly one seed per 2–3 cm is fine; spring onions tolerate crowding well.
- Press seeds gently into the surface and cover with a very thin layer of dry cocopeat or fine soil — no more than 1 cm deep. Deeper burial slows germination significantly.
- Mist the surface with water and keep the tray in partial shade for the first 5–7 days until seeds germinate.
- Once seedlings are 3–4 cm tall, move the tray to a spot that gets 4–6 hours of direct sunlight.
Seeds germinate in 7–10 days under cool weather conditions. First harvest is ready in 8–10 weeks from sowing. Varieties to look for at Indian seed shops: Pusa White Bunching (developed by IARI for Indian conditions), All Season (widely available), and Pusa Ageti White. Each packet typically costs ₹30–₹60 and contains enough seeds for several trays.
Method 2: From mandi roots (regrowth method)
This is the fastest and cheapest way to start. Next time you buy a bunch of spring onions from the sabzi mandi, do not throw the root ends away.
How to do it:
- Cut the entire bunch so that each piece has 3–5 cm of white root-end below where the green stalks begin. You are keeping the bottom section, not the green tops.
- Fill a container or tray with soil and plant the root ends upright with the cut end pointing up and the roots pointing into the soil. Push them in so they are roughly two-thirds buried.
- Space them 4–5 cm apart — a standard sabzi mandi bunch of 8–10 onions fits comfortably in a medium 20 cm pot.
- Water gently and keep in a spot with morning sun.
- New green growth emerges from the cut ends within 5–7 days. Full stalks are ready in 2–3 weeks.
The regrowth method works because the root system is already established. The plant simply redirects energy into producing new stalks. You can repeat this cycle 2–3 times from the same root end before the plant exhausts itself and the stalks come back thin and weak.
One important note: regrown stalks from mandi bunches tend to be slightly thinner than seed-grown plants because mandi spring onions are harvested young. If you want thick, full stalks you will get better results from seeds or sets in the long run.
Method 3: From sets (small bulbs)
Sets are tiny, partially developed onion bulbs sold at nurseries and farm supply shops, usually between October and November when the cool season begins. They are a faster alternative to seeds — you get harvest-ready stalks in 5–6 weeks rather than 8–10 — and they produce slightly thicker stalks than seeds.
How to do it:
- Source sets from a local nursery or online. A small bag of 50–100 sets typically costs ₹40–₹80.
- Plant them in your prepared tray, pointed end up, with the top of the set just at or slightly below the soil surface.
- Space them 5 cm apart in all directions.
- Water in well and keep in partial shade for the first few days.
Sets are particularly useful if you want to stagger your harvest — plant a new tray of sets every 3–4 weeks through November and December so you always have spring onions at different stages of growth.
Choosing the right container
Spring onions are shallow-rooted. Unlike tomatoes or brinjal that need 30–40 cm of soil depth, spring onions are comfortable in just 12–15 cm. This makes them ideal for the flat, wide containers and seed trays that most terrace gardeners already have.
Best container options:
- Wide seed trays or seedling trays (40 cm × 25 cm, 12–15 cm deep): ideal for dense broadcast sowing. One tray produces enough spring onions for regular kitchen use.
- Rectangular balcony planters (60 cm × 20 cm): good for window ledges and railing-mounted boxes. These look neat and can be used in rows.
- Medium grow bags (12–15 litre, 30 cm diameter): work well if you already have grow bags from other crops. Lay the grow bag flat and fold the sides down to reduce depth if it is too tall.
- Repurposed containers — old plastic dabbas, cut plastic bottles, even wide terracotta bowls — all work fine. Ensure drainage holes at the bottom; waterlogged soil causes bulb rot.
What to avoid: very deep pots (over 25 cm) are not a problem technically, but they use more soil than necessary and dry out more slowly, which can lead to overwatering. Deep individual pots (10 cm diameter) work but produce only 1–2 plants each, which is impractical for kitchen use.
A single wide tray measuring 40 cm × 25 cm can comfortably hold 20–30 spring onions at once — enough for weekly harvests through the cool season.
Soil mix for spring onions in containers
Spring onions prefer loose, well-draining soil that retains just enough moisture to keep the roots consistently damp. Compacted or heavy soil causes thin, poorly developed bulbs and slow top growth.
A reliable mix for Indian terrace conditions:
- 40% cocopeat (widely available in 5 kg bricks for ₹80–₹120 at nurseries)
- 30% vermicompost or well-rotted compost
- 30% garden soil or regular potting mix
If you do not have cocopeat, substitute with sand (river sand or construction sand washed clean) to improve drainage. The key is that water should pass through freely — if you water from the top, you should see it draining from the bottom within a few seconds.
Fertiliser at sowing time: spring onions are light feeders. The single most useful input is a small amount of nitrogen to support early leaf growth. Mix in one tablespoon of neem cake per litre of soil when preparing your container, or add a quarter teaspoon of urea dissolved in 1 litre of water and use it to water in the seeds on sowing day. If you prefer organic inputs, a 10% jeevamrit solution (50 ml jeevamrit diluted in 450 ml water) applied once a week for the first three weeks gives adequate nitrogen without risking leaf burn. Beyond this initial feed, spring onions growing in a vermicompost-rich mix need no additional fertiliser.
Avoid: fresh cow dung or uncomposted kitchen waste in the soil mix — these can burn young roots and introduce pathogens. Use only fully composted or vermicomposted material.
Best season for spring onion in India
Cool weather is the single biggest factor that determines spring onion quality in Indian home gardens. Below 25°C, spring onions grow compact, with thick stalks and a mild, slightly sweet flavour. Above 30°C, they bolt quickly, produce thin stringy stalks, and develop a stronger, more pungent taste that many cooks find unpleasant in raw preparations.
North India (Delhi, Lucknow, Kanpur, Agra, Jaipur, Chandigarh):
The prime window is mid-October to early March. Sow in October for November–December harvests, or sow in November for December–January harvests. A tray sown in October can give you two or three cut-and-come harvests before March warmth affects quality. Avoid sowing after March — you will get plants, but expect pungent, thin stalks and faster bolting.
Central India (Indore, Bhopal, Nagpur):
October to February. Winters here are shorter and warmer than North India, so aim for a mid-October sowing to make the most of the cool months.
South India (Bengaluru, Hyderabad, Chennai, Pune):
Bengaluru and Pune, which sit at higher elevations, have mild winters (15–22°C at night) that are good for spring onions from October to February. Chennai and lower-elevation coastal cities have warmer winters and get mixed results — plants grow but tend to be pungent.
Mumbai:
The mild coastal winter (18–25°C in December–January) allows reasonable spring onion growth from November to February. Expect slightly pungent stalks compared to North Indian cool-season crops, but still very usable.
Year-round growing: spring onions can be grown year-round in India, and they will survive through summer in most regions. However, summer-grown spring onions in North India are significantly more pungent, the stalks are thin, and the plants bolt to flower faster, meaning a shorter harvest window. If you are growing for kitchen use rather than as an experiment, cool-season growing gives consistently better results.
See the seasonal planting calendar for month-by-month sowing guidance across Indian regions.
Watering spring onions in containers
Consistent moisture is the key principle. Spring onions do not like to dry out completely between waterings, nor do they tolerate waterlogged soil. Both extremes cause problems — drought stress makes the stalks thin and fibrous, while overwatering causes root rot and soft, yellowing plants.
Practical watering routine:
- Check the soil every morning by pressing a finger 2–3 cm into the surface. If it feels dry at that depth, water thoroughly until it drains from the bottom.
- In North Indian winters (October–February), this typically means watering every 2–3 days. In warmer months or if your tray is in a windy spot, you may need to water daily.
- Water at the base of the plants, not over the leaves. Wet foliage, especially in cool humid conditions, encourages fungal diseases including rust (see the problems section below).
- A drip line or a thin-spout watering can works better than a broad shower head, which can wash seeds out of the soil immediately after sowing.
In grow bags: grow bags dry out faster than plastic or terracotta containers because fabric breathes on all sides. Check moisture once a day during dry spells and increase watering frequency accordingly.
Monsoon growing: if you are growing spring onions through the kharif season (June–October), ensure your containers have excellent drainage and consider moving trays under a sheltered overhang during heavy rain. Waterlogged soil for even 24–48 hours can kill the root system.
Harvesting spring onions — three approaches
How you harvest determines how long your tray keeps producing. There are three approaches, each suited to a different use.
Full pull (individual plants)
When individual plants reach 20–22 cm in height, pull them out completely — bulb and all. This gives you the maximum size plant with a small white bulb at the base, which is the most versatile form for cooking. Use this method when you need whole spring onions for a specific dish. Space left behind can be filled with a new set or seedling.
Cut-at-25 cm (whole tray harvest)
When most plants in a tray reach 25–30 cm, cut the entire tray at once using scissors or a sharp knife. Cut at 2–3 cm above soil level — not flush with the soil, and not high up on the stalk. Cutting too high means you are leaving a lot of stalk behind that will not regrow cleanly.
After cutting, water the tray and add a very light feed — a diluted jeevamrit or half-strength liquid fertiliser — to support regrowth. New green shoots emerge in 5–10 days. You will typically get 2–3 full harvests from one sowing this way before the plants become weak and unproductive.
Cut-and-come at 5 cm (extended production)
For maximum total yield from a tray, cut all stalks back to 5 cm above soil level. The stump left behind contains the growing point and enough stored energy to regenerate. New growth takes 2–3 weeks to reach harvestable height again, but the plant regrows 2–3 more times. This is the most efficient method if you want a continuous supply through the cool season from a single sowing.
When to stop: once regrown stalks come back consistently thinner than a pencil (under 5 mm diameter) and the plants take more than 3 weeks to reach 15 cm, the tray has exhausted itself. At this point, pull everything out, refresh the soil mix with a fresh batch of vermicompost, and start a new sowing.
Common problems with spring onions at home
Rust (orange pustules on leaves)
Rust is the most common disease affecting home-grown spring onions across India, particularly in humid conditions or during unseasonal rains. It appears as small orange or rust-brown raised pustules on the leaf surface. Severely affected leaves turn yellow and dry up from the tip inward.
Rust is caused by a fungus (Puccinia allii) and spreads through spores carried on the wind or splashed up by watering. Cool, wet conditions favour its spread.
What to do:
- Remove and dispose of heavily infected leaves immediately — do not compost them.
- Improve air circulation by thinning overcrowded trays slightly.
- Avoid overhead watering; water at the base only.
- A diluted neem oil spray (5 ml neem oil + 1 ml liquid soap per litre of water) applied to both sides of leaves once a week can slow the spread of rust in early stages.
- If the infection is widespread across the tray, it is often better to harvest everything immediately (even at sub-optimal height), clean the tray thoroughly, and replant fresh.
For a detailed diagnosis guide and treatment options, see why does my spring onion have rust?
Thrips (pale streaking on leaves)
Thrips are tiny, slender insects (1–2 mm long) that feed by rasping the leaf surface and sucking out cell contents. The damage looks like pale silver-white streaks or patches on the leaves, often with a slightly shiny, papery texture. Heavy infestations cause distorted, silvery leaves and stunted plants.
In Indian terrace gardens, thrips are most common during dry, warm spells — they are less of a problem in true cool-season growing (November–January) and more common when you grow spring onions outside their ideal season.
What to do:
- Inspect leaves early in the morning when thrips are less active — look on the underside of leaves and inside the tight folds near the base.
- A strong stream of water (hosepipe or pump sprayer on jet setting) directed at the leaves dislodges thrips and reduces populations significantly.
- Neem oil spray (same preparation as for rust, above) is effective against thrips and can be used preventively once every 2 weeks.
- Yellow sticky traps placed just above the tray canopy catch adult thrips and help you monitor infestation levels.
- Avoid broad-spectrum chemical pesticides on a food crop you will harvest within weeks. Neem oil is adequate for home-garden thrips management in most cases.
Yellowing leaves
Yellowing that starts at the tips and progresses toward the base is usually caused by one of three things: overwatering (most common in containers without adequate drainage), nitrogen deficiency (in soil that is too old or too low in compost), or natural senescence of the oldest outer leaves. Check drainage first — if the soil smells sour or feels consistently wet, improve drainage and reduce watering frequency. If the soil is well-draining but leaves are pale overall, apply a diluted liquid fertiliser with nitrogen (jeevamrit, or liquid seaweed fertiliser at half strength).
Frequently asked questions
Can I grow spring onion on my Mumbai or Bengaluru balcony in summer?
Yes, spring onions will grow in Mumbai and Bengaluru year-round, but summer quality is noticeably different from cool-season quality. Summer-grown spring onions in these cities develop thinner stalks and a sharper, more pungent flavour because the plant rushes toward flowering in warm temperatures. For mild-flavoured, thick stalks ideal for salads and garnishes, stick to October–February in Mumbai and October–March in Bengaluru. If you are growing for cooked dishes where pungency is welcome — Chinese-style stir fries, parathas — summer growing is perfectly workable.
How many spring onions will I get from one tray?
A 40 cm × 25 cm tray sown with seeds at a spacing of roughly one seed per 2–3 cm will produce 30–40 plants per sowing. Using the cut-and-come method, that tray yields 2–3 harvests before replanting — so effectively 60–120 cut stems per growing season from a single tray. A tray grown from mandi roots (the regrowth method) with 10–12 root stubs produces around 20–36 harvestable stems across 2 regrowth cycles.
Do spring onions need full sun on the terrace?
Spring onions do best with 4–6 hours of direct sunlight per day. They tolerate partial shade better than most vegetables — a spot that gets morning sun and afternoon shade works well, especially in warmer months. In full shade (under 2 hours of direct sun), plants grow slowly and produce spindly, pale stalks. In intense summer sun (especially in Rajasthan and Central India from April onwards), some afternoon shading actually improves stalk quality by keeping the plant cooler.
Why are my spring onions thin even though they look healthy?
Thin stalks in otherwise healthy-looking plants are almost always a signal of one of three things: sowing too late in the season (warm temperatures push the plant toward rapid bolting rather than vegetative growth), soil that is too poor in organic matter (add vermicompost to the mix next time), or overcrowding beyond what the soil can support. For seed-sown trays, thin any clusters where multiple seedlings have germinated less than 1 cm apart — leave the strongest seedling in each cluster. For regrowth-method plants, thin stalk output naturally declines after the second regrowth cycle; this is a signal to start fresh.
Can I grow spring onion from the onions I already have at home?
Regular round onions (pyaaz) from the kitchen are not the same plant as spring onions and will not produce the same long green stalks. However, if your kitchen onions have started to sprout green shoots from the top, you can plant them in a pot and harvest the green tops — these are edible and taste similar to spring onion greens, though a bit stronger. For true hara pyaaz (long, slender, mild stalks), start with spring onion seeds, sets, or mandi spring onion root ends specifically.
How do I stop the cut-and-come plants from bolting (going to flower)?
Bolting — where the plant sends up a central flower stalk rather than continuing to produce green tops — is mainly triggered by warm temperatures and long days, not by harvesting. In North India, this becomes a risk from February onwards as days lengthen and temperatures climb. To delay bolting: keep the tray in a slightly shaded spot from late January, ensure consistent watering (water stress speeds up bolting), and harvest promptly rather than letting stalks grow very tall before cutting. Once a stalk has bolted, cut it off at the base immediately; it will not revert to leafy growth, but removing it can slow the process in remaining plants.
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