Divisi
When to plant Irish potato in Mpwapwa
Dodoma, United Republic of Tanzania
Known here as viazi mviringo · kiazi
The Irish potato (mbatatisi, ikirayi, viazi mviringo) is a cool-weather crop grown for the tubers that swell underground — it is not a grain, and it is not the same plant as sweet potato.
| Measure | Rain-fed | With irrigation |
|---|---|---|
| Fit | Favourable | |
| When to plant | 7 Feb 2027 – 16 Feb 2027 opens in 19 weeks | 22 Mar 2027 – 9 Aug 2027 |
| Expected harvest | about 22.3 t/ha | about 42.6 t/ha |
| Harvest | From 18 Apr 2027 to 26 Jun 2027, depending on the planting date | |
| Ready to harvest | 70–130 days after planting | |
| Work it takes | 110–185 days per hectare, by hand | |
| Rain meets its needs | 74% | |
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 7 Feb 2027. That is the point in the window where the rains are most reliably established.
No seasonal forecast reaches Mpwapwa yet, so these dates follow the rains it usually gets rather than this year's.
Planting after 16 Feb 2027 leaves the crop short of season: it runs into the dry months before it has finished filling.
What decides this in Mpwapwa
| Rain and temperature | 96% |
|---|---|
| The soil | 96% |
| The lie of the land | 88% |
For irish potato in Mpwapwa, 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 2026/27 season in Mpwapwa
| Rainy seasons | One each year — one chance to plant, so timing carries it |
|---|---|
| When the rains are expected | November 2026 to May 2027 |
| Rain in a typical year | About 532 mm |
| This season's rain | Rain close to usual — plan around about 532 mm falling roughly when it always does |
| This season's heat | Hotter than usual — about +1.2 °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 all year, so nothing but rain ends the season |
| Ground this covers | 3 kinds of ground. The season below is the largest that farms — about 74% of this area. |
| 74% | enough rain for one short crop, and only if timed to it; warm all year, so nothing but rain ends the season 161 growing days · about 540 mm · November to April |
|---|---|
| 13% | enough rain for one full main crop; warm all year, so nothing but rain ends the season 206 growing days · about 760 mm · November to June |
| 12% | enough rain for one full main crop; warm all year, so nothing but rain ends the season 201 growing days · about 790 mm · November to May |
last updated 16 September 2026
Limited water holds back about 25% of yield here.
What irish potato needs to grow here
| Soil it likes | well-drained loam or sandy loam soil |
|---|---|
| Soil sourness (pH) | Happiest between pH 5.0 and 6.5 |
| Spacing | 75 cm between rows, 28 cm between plants |
| Feed it most with | potassium and magnesium |
What it takes to grow irish potato in Mpwapwa
| Planting material | About 47,000 plants per hectare |
|---|---|
| Nitrogen (N) | About 74 kg per hectare |
| Phosphate (P₂O₅) | About 22 kg per hectare |
| Potash (K₂O) | About 129 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. |
| Hand work | 110–185 days per hectare, by hand |
These are the nutrients a irish potato 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 Irish potato with a plan, not a guess
Everything above describes Mpwapwa 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 Irish potato nearby
Irish potato 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 irish potato grow well in Mpwapwa?
Mpwapwa rates as favourable for irish potato.
When should I plant irish potato in Mpwapwa?
Typically 7 Feb 2027 to 16 Feb 2027, typical season.
Is this exact for my own field?
No — these are readings taken across Mpwapwa, not on your field. Soil, slope and rainfall change from one farm to the next. Check your own location to see your own numbers.
