Plant PulseCorn
Zea mays
Corn. Sourced figures stay next to their citation. Planting windows are listed for locations that have one. Unsourced fields say coming soon.
Unverified — based on Field Crops – Maize – Sinhala, Department of Agriculture Sri Lanka, Sinhala page, accessed 2026-10-20: https://doa.gov.lk/field-crops-maize-si/; confirm for your microclimate.
Spacing
- In-row spacing
- coming soon
- Between-row spacing
- coming soon
Other sourced figures
- Days to first harvest
- 105–115 days
- Soil pH
- 5.8–7
From farmer field experience
Based on hands-on growing experience from Sri Lankan farmers. Not yet verified against official sources.
- Days to first harvest: 90–110 days
- Days from sowing. The Sinhala page states 105–115 days, which is the number stored on the crop.
- Farmer field notenoted Oct 2026
- Harvest window: 10–15 days
- How long the cobs stay at a useful size.
- Farmer field notenoted Oct 2026
Planting windows
Colombo — Low Country Wet Zone
Official planting windows: coming soon.
From farmer field experience
Based on hands-on growing experience from Sri Lankan farmers. Not yet verified against official sources.
October–December
Direct sow
Using 105–115 stored days. Plant in Oct, first harvest about 105–115 days later (around January–February). Plant in Dec, first harvest around March–April. Calculated from the stored day count and the planting month. It is not a separate harvest calendar. Farmer field experience. Using 90–110 stored days. Plant in Oct, first harvest about 90–110 days later (around January–February). Plant in Dec, first harvest around March–April. Calculated from the stored day count and the planting month. It is not a separate harvest calendar.
Farmer field notenoted Oct 2026
Low Country Wet Zone, October–December.
Unverified — based on Farmer field experience, noted 2026-10-23; confirm for your microclimate.
Mid Country
September–October
Direct sow
Using 105–115 stored days. Plant in Sep, first harvest about 105–115 days later (around December–January). Plant in Oct, first harvest around January–February. Calculated from the stored day count and the planting month. It is not a separate harvest calendar. Farmer field experience. Using 90–110 stored days. Plant in Sep, first harvest about 90–110 days later (around December–January). Plant in Oct, first harvest around January–February. Calculated from the stored day count and the planting month. It is not a separate harvest calendar.
Sinhala maize page: under rain, the end of September or the beginning of October, more suitable in the dry and intermediate zones. This mid-country sample is not named on the page. The months are stored because the page says intermediate zones, and the note keeps that limit.
Unverified — based on Field Crops – Maize – Sinhala, Department of Agriculture Sri Lanka, accessed 2026-10-20: https://doa.gov.lk/field-crops-maize-si/; confirm for your microclimate.
April
Direct sow
Using 105–115 stored days. Plant in Apr, first harvest about 105–115 days later (around July–August). Calculated from the stored day count and the planting month. It is not a separate harvest calendar. Farmer field experience. Using 90–110 stored days. Plant in Apr, first harvest about 90–110 days later (around July–August). Calculated from the stored day count and the planting month. It is not a separate harvest calendar.
Sinhala maize page: Yala at the beginning of April, for the dry and intermediate zones named in the same section.
Unverified — based on Field Crops – Maize – Sinhala, Department of Agriculture Sri Lanka, accessed 2026-10-20: https://doa.gov.lk/field-crops-maize-si/; confirm for your microclimate.
From farmer field experience
Based on hands-on growing experience from Sri Lankan farmers. Not yet verified against official sources.
September–November
Direct sow
Using 105–115 stored days. Plant in Sep, first harvest about 105–115 days later (around December–January). Plant in Nov, first harvest around February–March. Calculated from the stored day count and the planting month. It is not a separate harvest calendar. Farmer field experience. Using 90–110 stored days. Plant in Sep, first harvest about 90–110 days later (around December–January). Plant in Nov, first harvest around February–March. Calculated from the stored day count and the planting month. It is not a separate harvest calendar.
Farmer field notenoted Oct 2026
Mid Country, September–November.
Unverified — based on Farmer field experience, noted 2026-10-23; confirm for your microclimate.
March–April
Direct sow
Using 105–115 stored days. Plant in Mar, first harvest about 105–115 days later (around June–July). Plant in Apr, first harvest around July–August. Calculated from the stored day count and the planting month. It is not a separate harvest calendar. Farmer field experience. Using 90–110 stored days. Plant in Mar, first harvest about 90–110 days later (around June–July). Plant in Apr, first harvest around July–August. Calculated from the stored day count and the planting month. It is not a separate harvest calendar.
Farmer field notenoted Oct 2026
Mid Country, March–April.
Unverified — based on Farmer field experience, noted 2026-10-23; confirm for your microclimate.
Up Country Wet Zone
Official planting windows: coming soon.
From farmer field experience
Based on hands-on growing experience from Sri Lankan farmers. Not yet verified against official sources.
Not recommended in this zone
Direct sow or transplant
Farmer field notenoted Oct 2026
Not recommended in this zone. Not recommended at this elevation in this note. This is reviewed field experience, not an official Department of Agriculture prohibition.
Unverified — based on Farmer field experience, noted 2026-10-23; confirm for your microclimate.
No when-to-plant page for a zone where this crop is not recommended.
Low Country Dry Zone
September–October
Direct sow
Using 105–115 stored days. Plant in Sep, first harvest about 105–115 days later (around December–January). Plant in Oct, first harvest around January–February. Calculated from the stored day count and the planting month. It is not a separate harvest calendar. Farmer field experience. Using 90–110 stored days. Plant in Sep, first harvest about 90–110 days later (around December–January). Plant in Oct, first harvest around January–February. Calculated from the stored day count and the planting month. It is not a separate harvest calendar.
Sinhala maize page: under rain, the end of September or the beginning of October. Both months are marked because a month is the finest step. Commercial cultivation is described as more suitable in the dry and intermediate zones.
Unverified — based on Field Crops – Maize – Sinhala, Department of Agriculture Sri Lanka, accessed 2026-10-20: https://doa.gov.lk/field-crops-maize-si/; confirm for your microclimate.
April
Direct sow
Using 105–115 stored days. Plant in Apr, first harvest about 105–115 days later (around July–August). Calculated from the stored day count and the planting month. It is not a separate harvest calendar. Farmer field experience. Using 90–110 stored days. Plant in Apr, first harvest about 90–110 days later (around July–August). Calculated from the stored day count and the planting month. It is not a separate harvest calendar.
Sinhala maize page: Yala at the beginning of April. The grid marks all of April.
Unverified — based on Field Crops – Maize – Sinhala, Department of Agriculture Sri Lanka, accessed 2026-10-20: https://doa.gov.lk/field-crops-maize-si/; confirm for your microclimate.
From farmer field experience
Based on hands-on growing experience from Sri Lankan farmers. Not yet verified against official sources.
October–November
Direct sow
Using 105–115 stored days. Plant in Oct, first harvest about 105–115 days later (around January–February). Plant in Nov, first harvest around February–March. Calculated from the stored day count and the planting month. It is not a separate harvest calendar. Farmer field experience. Using 90–110 stored days. Plant in Oct, first harvest about 90–110 days later (around January–February). Plant in Nov, first harvest around February–March. Calculated from the stored day count and the planting month. It is not a separate harvest calendar.
Farmer field notenoted Oct 2026
Low Country Dry Zone, Maha, October–November, rainfed.
Unverified — based on Farmer field experience, noted 2026-10-23; confirm for your microclimate.
April–May
Direct sow
Using 105–115 stored days. Plant in Apr, first harvest about 105–115 days later (around July–August). Plant in May, first harvest around August–September. Calculated from the stored day count and the planting month. It is not a separate harvest calendar. Farmer field experience. Using 90–110 stored days. Plant in Apr, first harvest about 90–110 days later (around July–August). Plant in May, first harvest around August–September. Calculated from the stored day count and the planting month. It is not a separate harvest calendar.
Farmer field notenoted Oct 2026
Low Country Dry Zone, Yala, April–May, irrigated.
Unverified — based on Farmer field experience, noted 2026-10-23; confirm for your microclimate.