Divisi
When to plant Onion in Sebaa
Adrar, Algeria
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.
| Fit | Favourable |
|---|---|
| When to plant | 8 Oct 2026 – 10 Feb 2027 opens in 1 week |
| Expected harvest | about 45.0 t/ha |
| Harvest | From 6 Jan 2027 to 10 Jun 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 Jan 2027. That is the point in the window where the rains are most reliably established.
This season's rainfall outlook for Sebaa is close to normal, so these dates match the pattern the area usually follows.
Planting after 10 Feb 2027 leaves the crop short of season: it runs into the dry months before it has finished filling.
What decides this in Sebaa
| Rain and temperature | 96% |
|---|---|
| The soil | 96% |
| The lie of the land | 88% |
For onion in Sebaa, the lie of the land is the tightest of the three at 88%. You cannot flatten it, but you can farm it: plant along the contour rather than up and down, ridge or tie ridges to hold water on the slope, and expect shallower rooting than the crop would manage on flat ground.
The season in Sebaa
| Rain in a typical year | About 11 mm |
|---|---|
| This season's rain | Rain close to usual — plan around about 11 mm falling roughly when it always does |
| What that supports | too dry for rain-fed cropping without irrigation, warm, with a cool spell that slows winter growth |
| Ground this covers | One kind of ground throughout. |
last updated 18 September 2026
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 Sebaa
| Planting material | About 500,000 plants per hectare |
|---|---|
| Nitrogen (N) | About 81 kg per hectare |
| Phosphate (P₂O₅) | About 16 kg per hectare |
| Potash (K₂O) | About 90 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 Sebaa 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.
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 Sebaa?
Sebaa rates as favourable for onion.
When should I plant onion in Sebaa?
Typically 8 Oct 2026 to 10 Feb 2027, forecast-adjusted.
Is this exact for my own field?
No — these are readings taken across Sebaa, not on your field. Soil, slope and rainfall change from one farm to the next. Check your own location to see your own numbers.