Divisi
When to plant Onion in Oshimili South
Delta, Nigeria
Known here as albasa
Onion is a cool-season vegetable you grow for its bulb — the swollen base of the leaves — but across sub-Saharan Africa it is most often grown as an irrigated hot dry-season crop, and it stands real heat (up to about 42 °C) as long as the water never stops.
| Measure | Rain-fed | With irrigation |
|---|---|---|
| Fit | Favourable | |
| When to plant | 20 Mar 2027 – 23 Aug 2027 opens in 24 weeks | 21 Jan 2026 – 1 Jan 2027 |
| Expected harvest | about 20.8 t/ha | about 31.3 t/ha |
| Harvest | From 18 Jun 2027 to 21 Dec 2027, depending on the planting date | |
| Ready to harvest | 90–120 days after planting | |
Rain-fed. These dates are worked out from each place's own rainfall, for a field watered by the season — with irrigation a window can open earlier, close later, or come round more than once a year. Check your own field under What grows, or get the Divisi app for a calendar dated to your farm.
If you only get one chance to plant, aim for around 1 Apr 2027. That is the point in the window where the rains are most reliably established.
This season's rainfall outlook for Oshimili South leans dry, so these dates sit later than the long-run average. Planting on the date you are used to risks germinating into a false start and having to replant.
Planting after 23 Aug 2027 leaves the crop short of season: it runs into the dry months before it has finished filling.
What decides this in Oshimili South
| Rain and temperature | 88% |
|---|---|
| The soil | 76% |
| The lie of the land | 88% |
For onion in Oshimili South, the soil is the tightest of the three at 76%. This is the one you can actually move. Lime raises a sour soil, manure and compost lift what it holds, and both work within a season or two — money spent here changes the answer.
The 2026 season in Oshimili South
| Rainy seasons | One each year — one chance to plant, so timing carries it |
|---|---|
| When the rains are expected | March 2026 to November 2026 |
| Rain in a typical year | About 1,762 mm |
| This season's rain | Leaning dry — September and October look short of rain. Plant at the early end of the window, favour quicker and more drought-tolerant crops, and keep moisture in the soil: mulch, and weed early. |
| This season's heat | Hotter than usual — about +0.7 °C over the growing months. Heat makes the same rain do less, so a dry spell bites sooner: do not plant late, and shade or mulch what you can. |
| What that supports | enough rain for one full main crop, warm all year, so nothing but rain ends the season |
| Ground this covers | 4 kinds of ground. The season below is the largest that farms — about 32% of this area. |
| 32% | enough rain for one full main crop; warm all year, so nothing but rain ends the season 266 growing days · about 1,750 mm · March to November |
|---|---|
| 29% | enough rain for a long crop, or two in a year; warm all year, so nothing but rain ends the season 272 growing days · about 1,840 mm · March to November |
| 25% | enough rain for a long crop, or two in a year; warm all year, so nothing but rain ends the season 303 growing days · about 1,920 mm · February to December |
| 14% | enough rain for a long crop, or two in a year; warm all year, so nothing but rain ends the season 304 growing days · about 1,970 mm · February to December |
last updated 16 September 2026
Temperature holds back about 25% of yield here.
What onion needs to grow here
| Soil it likes | well-drained sandy loam or loam soil |
|---|---|
| Soil sourness (pH) | Happiest between pH 6.0 and 7.0 |
| Spacing | 20 cm between rows, 7 cm between plants |
| Feed it most with | nitrogen, potassium and sulphur |
What it takes to grow onion in Oshimili South
| Planting material | About 500,000 plants per hectare |
|---|---|
| Nitrogen (N) | About 37 kg per hectare |
| Phosphate (P₂O₅) | About 7 kg per hectare |
| Potash (K₂O) | About 42 kg per hectare |
| In the shops | A basal compound at planting — Compound D, or an NPK blend — covers the phosphate and potash. A nitrogen top dressing — urea or AN — goes on once the crop is established. |
These are the nutrients a onion crop of that size carries off the field. What you actually apply depends on what your soil already holds — which is what a soil test, or the app's field records, tell you.
What to watch for
Grow Onion with a plan, not a guess
Everything above describes Oshimili South as a whole — your own soil, slope and rainfall will shift the dates. The Divisi app works them out for your field, and dates each job that follows.
Onion in nearby districts
This calendar moves
Planting windows shift with the forecast. Leave your email and we'll send what changed, and a note when planting time nears — a couple of emails a month at most.
Frequently asked questions
Will onion grow well in Oshimili South?
Oshimili South rates as favourable for onion.
When should I plant onion in Oshimili South?
Typically 20 Mar 2027 to 23 Aug 2027, forecast-adjusted.
Is this exact for my own field?
No — these are readings taken across Oshimili South, not on your field. Soil, slope and rainfall change from one farm to the next. Check your own location to see your own numbers.
