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Growing with the seasons: a field guide to farming in Sri Lanka

What grows where, when to plant it, and how Sri Lanka's two monsoon seasons shape almost every cultivation decision on the island.

Sri Lanka's agriculture is built around water — specifically, around two monsoons that arrive from opposite directions at opposite times of year. Nearly every cropping decision a farmer makes, from which paddy variety to sow to when to plant vegetables in the hill country, traces back to these two rainfall patterns. Understanding them is the single most useful piece of agricultural knowledge for anyone growing, buying from, or trading with Sri Lankan farms.

This page is a starting point: an overview of the island's growing zones, its two cultivation seasons, and the crops best suited to each. For the detailed week-by-week paddy schedule — including fertilizer timing, pest windows, and variety selection — use the Crop Calendar tool linked at the bottom of this page.

The three agro-climatic zones

Sri Lanka is divided into three broad zones based on annual rainfall, and the same crop can behave very differently depending on which zone it's grown in.

Wet Zone
> 2,500 mm / year
  • Southwest quarter of the island
  • Rain fairly well spread across the year
  • Home to tea, rubber, and most home-garden vegetables
  • Paddy grown mainly rainfed / semi-irrigated
Intermediate Zone
1,750–2,500 mm / year
  • Transition belt between wet and dry zones
  • Mixed cropping: paddy, coconut, and field crops
  • More dependent on the Maha monsoon than the wet zone
Dry Zone
< 1,750 mm / year
  • Covers most of the north, east, and southeast
  • Almost all rain falls during the Maha season
  • Relies heavily on ancient tank irrigation systems
  • Sri Lanka's main paddy bowl, plus chilli and onion

What to grow, and when

A practical cross-reference of common Sri Lankan crops against the season and zone they perform best in.

Crop groupExamplesBest seasonNotes
Paddy Nadu & Samba varieties, short (2½–3 mo) to long (4–4½ mo) duration MahaYala Variety duration is chosen to fit the season length — shorter-duration varieties suit Yala's tighter water window.
Other field crops Maize, green gram, cowpea, black gram, soya bean, groundnut, kurakkan Maha Grown mainly in rotation with paddy in the dry-zone Maha season; need less water than rice.
Upcountry vegetables Carrot, cabbage, leeks, beans, potato Yala The cooler April–August period suits temperate vegetables in Nuwara Eliya and the central highlands.
Lowland vegetables Tomato, brinjal, okra, chilli, pumpkin Year-round, zone-dependent Grown throughout the year in the wet and intermediate zones with irrigation; chilli and onion are major dry-zone Yala crops.
Plantation crops Tea, rubber, cinnamon Not seasonal Perennial crops confined mostly to the wet zone; harvested year-round rather than by season.
Coconut — Not seasonal Perennial, grown along the coastal belt and intermediate zone; planting timed to the start of the rains.
Fruits Banana, papaya, pineapple, mango Mostly not seasonal New plantings are usually timed to the start of Maha rains to establish before dry spells.

Why this matters for farm planning

  • Land preparation timing is everything. Starting even a few weeks late against the monsoon can mean the crop matures into a dry spell, or misses the harvest window before the next rains.
  • Variety duration should match season length, not just yield potential — a long-duration, high-yield paddy variety sown too late in Yala can run out of water before harvest.
  • Zone changes the season's meaning. "Maha" brings heavy, reliable rain to the dry zone but is a secondary season in the wet zone, where rainfall is spread more evenly year-round.
  • Pest and disease pressure follows the calendar too. Wetter months bring different pest risks than dry ones — timing your planting also times your pest exposure.

Two seasons, one calendar

Almost all seasonal planning in Sri Lanka is organised around Maha and Yala — the two cultivation seasons set by the island's monsoons.

Main season
Maha
September/October → March
  • Driven by the North-East monsoon, which brings the heaviest and most reliable rain of the year, especially to the dry zone.
  • The larger of the two seasons — most of the country's paddy land is cultivated in Maha.
  • Land preparation typically starts with the first rains in September/October; harvest runs January–March depending on variety.
  • Best season for paddy, maize, green gram, cowpea, and most highland field crops in the dry and intermediate zones.
Minor season
Yala
April/May → August
  • Driven by the South-West monsoon, which favours the wet zone but brings far less rain to the dry zone.
  • The smaller season — dry-zone paddy in Yala usually depends on stored irrigation water rather than direct rainfall.
  • Land preparation from April/May; harvest runs July–August.
  • Good season for irrigated paddy, and — in the cooler upcountry — temperate vegetables like carrot, cabbage, and leeks.