Divisi
When to plant Onion in Cape Winelands
Western Cape, South Africa
Known here as u-anyanisi · itswele · ui
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 | 28 May 2027 – 17 Jun 2027 opens in 34 weeks | 30 Jun 2026 – 21 Jan 2027 |
| Expected harvest | about 18.0 t/ha | about 15.4 t/ha |
| Harvest | From 26 Aug 2027 to 15 Oct 2027, depending on the planting date | |
| Ready to harvest | 90–120 days after planting | |
| Rain meets its needs | 79% | |
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 28 May 2027. That is the point in the window where the rains are most reliably established.
This season's rainfall outlook for Cape Winelands is close to normal, so these dates match the pattern the area usually follows.
Planting after 17 Jun 2027 leaves the crop short of season: it runs into the dry months before it has finished filling.
What decides this in Cape Winelands
| Rain and temperature | 88% |
|---|---|
| The soil | 76% |
| The lie of the land | 76% |
For onion in Cape Winelands, 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 Cape Winelands
| When the rains are expected | April 2026 to September 2026 |
|---|---|
| Rain in a typical year | About 436 mm |
| This season's rain | Rain close to usual — plan around about 436 mm falling roughly when it always does |
| This season's heat | Hotter than usual — about +1.6 °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 short crop, and only if timed to it, warm, with a cool spell that slows winter growth |
| Ground this covers | 4 kinds of ground. The season below is the largest that farms — about 31% of this area. |
| 39% | too dry for rain-fed cropping without irrigation; warm, with a cool spell that slows winter growth no rain-fed season · about 200 mm |
|---|---|
| 31% | enough rain for one short crop, and only if timed to it; warm, with a cool spell that slows winter growth 146 growing days · about 390 mm · April to September |
| 16% | enough rain for one full main crop; warm, with a cool spell that slows winter growth 200 growing days · about 650 mm · April to October |
| 6% | enough rain for one short crop, and only if timed to it; cool for part of the year, so frost sets the planting date 147 growing days · about 390 mm · April to September |
last updated 17 September 2026
Limited water 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 Cape Winelands
| Planting material | About 500,000 plants per hectare |
|---|---|
| Nitrogen (N) | About 32 kg per hectare |
| Phosphate (P₂O₅) | About 6 kg per hectare |
| Potash (K₂O) | About 36 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 Cape Winelands 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.
Where to sell Onion nearby
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 Cape Winelands?
Cape Winelands rates as favourable for onion.
When should I plant onion in Cape Winelands?
Typically 28 May 2027 to 17 Jun 2027, forecast-adjusted.
Is this exact for my own field?
No — these are readings taken across Cape Winelands, not on your field. Soil, slope and rainfall change from one farm to the next. Check your own location to see your own numbers.
