Green House Farming in India: Types, Techniques, Cost and Subsidy

Green house farming pays when a controlled crop earns enough more than an open-field crop to carry a heavy structure. You grow under a frame covered with plastic film, shade net, polycarbonate or glass, which lets you manage heat, moisture and pests closely. Most commercial units in India are naturally ventilated polyhouses growing capsicum, cucumber, tomato and cut flowers, so the practice is also called poly farming.

The numbers back that up, with a catch. In a Haryana farm survey published in the Indian Journal of Horticulture in 2020, polyhouse capsicum gave 36.3 tonnes per acre against 13.1 in the open field, and net income rose from about ₹62,000 to ₹6.92 lakh per acre. The structure alone cost ₹34 lakh per acre, and a two-crop cucumber system did not recover its costs without subsidy.

Choose the crop and the buyer first, then the structure for your climate, and run the numbers without subsidy, because the rules changed in August 2026.

Which type of green house suits your climate and crop?

Cooling method and cost separate the types more than roof shape does. The costs below come from Tamil Nadu Agricultural University's (TNAU) greenhouse reference, which is undated, so read them as ranges.

For polyhouse film, TNAU recommends 200 micron UV-stabilised polyethylene, and its table gives UV-resistant polyethylene about two years of life against decades for polycarbonate or glass, so budget for replacement.

How much does a 1 acre polyhouse cost?

Without full automation, expect quotes of ₹12 lakh to ₹44 lakh for 4,000 sq m, a little under an acre, before land.

The last column is the rate times 4,000 sq m. Price moves with frame steel and wind rating, film grade, cooling, foundation, drip and a pack house, so ask every supplier to quote the same list. One source is undated and the other is from 2020, so test both against current quotes.

How is green house farming done, step by step?

1. Fix the crop and the buyer. The National Horticulture Board's (NHB) earlier scheme guideline names capsicum, cucumber, tomato, gerbera, rose and carnation among others. Check wholesale prices across the year first.
2. Test the water and the land. Salinity and supply decide whether a site works; the Food and Agriculture Organization's (FAO) guide to greenhouse vegetables advises flat land, away from hollows and fog pockets where cold air pools.
3. Size and place the house. TNAU says a naturally ventilated house should stay within 50 m by 50 m, with 10 to 15 m between houses. FAO says roof vents should face the prevailing wind.
4. Prepare the medium. TNAU's target is pH 5.0 to 7.0 and EC (a salt measure) 0.4 to 1.4 dS/m, after steam or fumigation. Vermicompost can supply organic matter; soilless mixes need more frequent feeding.
5. Install drip lines, a filter and a fertigation injector for measured doses of water and fertiliser.
6. Plant, train and scout daily, and run vents, fans or foggers by thermometer and hygrometer. Grade at harvest and keep produce cool; cold storage protects the price when a market is slow.

Four equipment groups make up the build:

What are the benefits of green house farming?

The benefit that shows in farm accounts is yield and price together, as the Haryana survey recorded for naturally ventilated polyhouses against open fields.

Part of the price gap is quality and part is timing, and only your buyer can say how much you will keep. Drip with fertigation can also use water more precisely, but savings depend on crop and design, so budget for none.

What are the disadvantages of a green house?

Farmers in the same survey ranked seed cost and market glut as their top economic problems, and weather stress inside the structure as their top technical one.

• Thin margins: a cucumber-after-cucumber rotation had a benefit-cost ratio of 0.95 without subsidy and 1.53 with it. Below 1, the crop does not repay its costs.
• Market glut: when a district plants one crop, the premium shrinks, so fix a buyer before planting.
• Heat: fan and pad cooling cannot go below the wet-bulb temperature.
• Pests: a cover does not shut them out. FAO notes that intensive greenhouse production has favoured serious pests and diseases.

Is there a subsidy for green house farming in 2026?

Yes, through two routes, though the terms changed in August 2026. This section is as of October 2026.

The first is the Mission for Integrated Development of Horticulture (MIDH), run by state horticulture departments. A 2023 Rajya Sabha reply, reported by Agriculture Post, put assistance for greenhouse structures at 50% of the cost norm, up to 4,000 sq m per beneficiary. MIDH's 2025 guidelines require subsidised items to meet Bureau of Indian Standards norms, so ask your district horticulture office for the current norms.

The second is NHB's credit-linked, back-ended subsidy: you build on a bank loan and the subsidy follows. Its earlier guideline offered 50% on projects above 2,500 sq m. A public circular of 21 August 2026 listed protected cultivation among the components with revised assistance rates, excluded land cost and limited assistance to one member per family. Pune flower growers protested in September, asking for the 50% rate back. Read the new rate table before you sign a loan, and model your project without subsidy.

Banks also want a costed plan and supplier quotations before they sanction a loan.

What should you do before you invest in a green house?

1. Get three quotations against one specification: same area, cover, cooling, drip and pack house.
2. Visit a running unit in your climate and ask how it handled last May and June.
3. Build the sheet without subsidy. If the benefit-cost ratio is below 1, change the crop or the size first.
4. If you are new, start with one low-cost bay of about 500 sq m, roughly ₹1.5 lakh to ₹2.5 lakh at TNAU's low-cost rates.
5. Plan the surplus: grading, cold storage and, where volumes justify it, vegetable processing.

For other farm-based options to compare, see the agriculture business ideas hub.

Frequently asked questions about green house farming

What is the difference between a greenhouse, a polyhouse and a shade net house?

A polyhouse is a greenhouse covered with plastic film, and a shade net house is covered with net; both sit under the wider term greenhouse. Film holds heat and keeps rain off the crop, while net mainly cuts sun and heat. Glass and polycarbonate last far longer than film but cost more to build.

Which crops does the government scheme support?

NHB's earlier guideline listed capsicum, cucumber and tomato among vegetables, and anthurium, orchids, rose, lilium, chrysanthemum, carnation and gerbera among flowers. The August 2026 revision may change the detail, so confirm with NHB or your district office. Choose by buyer and price, not by the list alone.

Does a greenhouse keep pests away?

It keeps out some pests, not all. FAO's guide says intensive greenhouse production has favoured serious pests and diseases, and it recommends integrated production and protection to cut pesticide use. Insect nets help, but nets that are too fine restrict airflow, so check the vent area.

How big should the first green house be?

Nothing stops you from starting with a single bay. MIDH covers up to 4,000 sq m per beneficiary, and NHB's earlier guideline asked for more than 2,500 sq m. TNAU says a naturally ventilated house should stay within 50 m by 50 m, so larger projects use several houses.

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