Planning polyhouse farming in Thiruvallur? Thiruvallur is a town in Tiruvallur district, Tamil Nadu, home to about 54,000 people (Census 2011)[1], about 40 km from Chennai. This guide works from Thiruvallur's own monthly climate to suggest the protected structure, the crops to start with, and the months each crop is likely to do well.
Climate for polyhouse farming in Thiruvallur
May is the hottest month in Thiruvallur, with average daily highs of about 36°C. January has the coolest nights, averaging 21°C.[2] The area gets about 1,253 mm of rain a year, most of it in July to December, peaking in November at about 292 mm. Average humidity stays at 75% or more in September to January, which raises the risk of leaf disease and slows evaporative cooling. Thiruvallur sits about 44 m above sea level.[1] On the Köppen–Geiger climate map, Thiruvallur falls in the tropical savanna (dry winter) zone (Aw).[3]
Thiruvallur climate by month
Month
Avg high (°C)
Avg low (°C)
Humidity (%)
Rain (mm)
Jan
27.7
20.5
77
16
Feb
30.3
21.0
71
6
Mar
33.7
23.1
66
15
Apr
35.4
25.6
66
26
May
35.9
27.2
65
55
Jun
34.7
26.5
64
68
Jul
33.7
25.7
67
108
Aug
32.8
25.2
72
132
Sep
31.6
25.0
77
145
Oct
30.1
24.6
80
264
Nov
28.3
23.2
82
292
Dec
27.3
21.6
80
126
Area averages (a grid cell of about 50 km) for 2001–2025, from NASA POWER, centred on Thiruvallur. Rainfall and night temperatures at your plot can differ, especially near hills and the coast.[2]
Advantages of protected cultivation in Thiruvallur
1
Year-round crops
A polyhouse stretches the season: in Thiruvallur cucumber can be grown for about 9 months a year under cover, longer than in the open field.
2
Better yield and price
Plants grow without rain, hail and wind damage, so yields are higher and more even, and clean, graded produce sells at a better price, especially off-season.
3
Less water
Drip irrigation under cover uses less water than flood irrigation, and the roof keeps November's 292 mm of rain off the crop and the soil.
4
Less pesticides
Insect net on vents and doors keeps out most pests, and controlled ventilation helps with leaf disease in the humid months (September to January), so you spray less often.
5
Subsidy eligible
Polyhouse, shade net and nethouse projects in Tamil Nadu can apply for Mission for Integrated Development of Horticulture (MIDH) assistance through the state horticulture department.[4]
Which polyhouse suits Thiruvallur?
For polyhouse farming in Thiruvallur, the structure decides which months you can crop and what it costs to run. In Thiruvallur the heat comes with humidity: during March to July average humidity is about 66%. Wet pads cool much less in humid air: on a typical May afternoon they would only bring 36°C down to about 32°C. So we usually start with a tall naturally ventilated polyhouse with wide roof vents, insect net and a shade screen. A Fan & Pad polyhouse still makes sense if buyers need lettuce through the hottest months, but expect a smaller temperature drop than in dry inland towns.
Plan for heavy rain in November (about 292 mm): raise the plinth, size the gutters for that month and keep drains away from the nutrient tank. Sunlight peaks in April at about 6.6 kWh per m² a day, so add a shade screen for leafy greens in the brightest months. A nethouse, the lowest-cost option, can grow hardy crops in January to March, when it is mild and fairly dry.
Crops for Thiruvallur
Based on Thiruvallur's climate, the crops with the longest growing windows are cucumber (9 months), chilli pepper (7 months) and brinjal (7 months). Cucumber fits July to March in a naturally ventilated polyhouse. Lilium and carnation are hard to time here, so we would leave them out of the first season. These are the crops we would plan first for polyhouse farming in Thiruvallur.
Months each crop suits in Thiruvallur
Crop
Naturally ventilated polyhouse
With Fan & Pad cooling
Capsicum
Oct–Feb
Jun–Apr
Tomato
Oct–Feb
Aug–Mar
Cucumber
Jul–Mar
All year
Chilli pepper
Aug–Feb
All year
Brinjal
Aug–Feb
All year
Lettuce
Dec–Jan
Nov–Feb
Broccoli
Difficult
Difficult
Strawberry
Difficult
Difficult
Rose
Jan
Jan–Feb
Gerbera
Dec–Jan
Nov–Feb
Carnation
Difficult
Difficult
Chrysanthemum
Jan
Jan–Feb
Anthurium
Nov–Jan
All year
Orchids
Nov–Jan
All year
Lilium
Difficult
Difficult
Kryzen planning estimate from the monthly averages above and each crop's usual day and night temperature range. Variety, soil or substrate temperature and shading change the result, so confirm with a trial.
₹8,325Spending per person per month, urban Tamil Nadu, 2023–24[5]
40 kmto Chennai, the nearest metro (straight line)
The Census counted 46,000 people in Thiruvallur in 2001 and 54,000 in 2011, a rise of 20%.[1] Urban households in Tamil Nadu spent an average of ₹8,325 per person per month in 2023–24, above the all-India urban average of ₹7,078.[5] Local demand in Thiruvallur may be small for exotic greens, so plan where the rest of the harvest goes. Avadi, about 20 km away, is the nearest larger market on our list. For premium vegetable and flower buyers, Chennai is within a day's delivery, about 40 km away.
Polyhouse farming in Thiruvallur with Kryzen
We have built 9 projects in Tamil Nadu so far (see our project map (opens in a new tab)). Thiruvallur is about 840 km in a straight line from our factory and master warehouse at Degaon, Wai (Satara), our nearest site.
Towns near Thiruvallur
We also plan and build farms in these towns near Thiruvallur:
Map: LGD 2024 boundaries via bharatlas, CC BY 4.0. For illustration only.
Polyhouse farming in Thiruvallur: FAQs
Can a polyhouse farm run all year in Thiruvallur?
Yes, with the right structure. For Thiruvallur we would plan a tall naturally ventilated polyhouse with wide vents and insect net. Even then, lettuce is hard to grow in March to October, so plan another crop for those months.
Which polyhouse is best for Thiruvallur?
With May highs of about 36°C and 65% average humidity in that month, we would start with a tall naturally ventilated polyhouse with wide vents and insect net.
Which crops should I grow in a polyhouse in Thiruvallur?
Going by the monthly climate, cucumber, chilli pepper and brinjal have the longest growing windows. Confirm prices and volumes with buyers before you plant.
Is polyhouse farming profitable in Thiruvallur?
It can be, if the crop, the structure and the buyers match. In Thiruvallur, cucumber and chilli pepper have the longest seasons under cover. Confirm prices and volumes with buyers first; our Detailed Project Report works out the cost, yield and returns for your plot.
Does Kryzen build polyhouses in Thiruvallur?
Yes. Our nearest site is our factory and master warehouse at Degaon, Wai (Satara), about 840 km away, and we have built 9 projects in Tamil Nadu.
Is there a subsidy for polyhouse or hydroponic farms in Tamil Nadu?
Yes. Protected cultivation projects in Tamil Nadu can apply for Mission for Integrated Development of Horticulture (MIDH) assistance through the state horticulture department. Check the current rate and area limit when you apply.
Discuss your Thiruvallur farm project
Share your plot location, water test and crop targets. We will suggest the right structure and growing system, and send an itemised quotation.
A computer engineer turned hydroponic farmer from a multigenerational farming family in Satara. Sudhir founded Kryzen in 2019, and the team has since built 350+ protected and hydroponic farms across India.
