When to plant Onion in Twifo Atti-Morkwa

Central, Ghana

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.

Onion in Twifo Atti-Morkwa, rain-fed and with irrigation
Measure	Rain-fed	With irrigation
Fit	Favourable
When to plant	17 Mar 2027 – 29 Aug 2027 opens in 24 weeks	30 Jun 2026 – 10 Jun 2027
Expected harvest	about 21.8 t/ha	about 33.2 t/ha
Harvest	From 15 Jun 2027 to 27 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 31 May 2027. That is the point in the window where the rains are most reliably established.

This season's rainfall outlook for Twifo Atti-Morkwa 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 29 Aug 2027 leaves the crop short of season: it runs into the dry months before it has finished filling.

What decides this in Twifo Atti-Morkwa

Rain and temperature	88%
The soil	96%
The lie of the land	76%

For onion in Twifo Atti-Morkwa, the lie of the land is the tightest of the three at 76%. 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 2026 season in Twifo Atti-Morkwa

When the rains are expected	February 2026 to December 2026
Rain in a typical year	About 1,333 mm
This season's rain	Leaning dry — February, 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 +0.8 °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 a long crop, or two in a year, warm all year, so nothing but rain ends the season
Ground this covers	One kind of ground throughout.

last updated 30 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 Twifo Atti-Morkwa

Planting material	About 500,000 plants per hectare
Nitrogen (N)	About 39 kg per hectare
Phosphate (P₂O₅)	About 8 kg per hectare
Potash (K₂O)	About 44 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

Pest/disease risk — manageableEarly-maturing — escapes late drought

Grow Onion with a plan, not a guess

Everything above describes Twifo Atti-Morkwa 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.

Or check your field first

Where to sell Onion nearby

Onion in nearby districts

How to grow Onion, step by step Land preparation to harvest — every task, in order

Frequently asked questions

Will onion grow well in Twifo Atti-Morkwa?

Twifo Atti-Morkwa rates as favourable for onion.

When should I plant onion in Twifo Atti-Morkwa?

Typically 17 Mar 2027 to 29 Aug 2027, forecast-adjusted.

Is this exact for my own field?

No — these are readings taken across Twifo Atti-Morkwa, not on your field. Soil, slope and rainfall change from one farm to the next. Check your own location to see your own numbers.