Divisi
When to plant Sweet potato in Chisamba
Central, Zambia
Known here as mbatata
Sweet potato is a trailing vine you grow from vine cuttings (slips), not from seed and not by planting the root.
| Measure | Rain-fed | With irrigation |
|---|---|---|
| Fit | Favourable | |
| When to plant | 6 Dec 2026 – 26 Dec 2026 opens in 9 weeks | same |
| Expected harvest | about 23.2 t/ha | about 32.4 t/ha |
| Harvest | From 6 Mar 2027 to 25 May 2027, depending on the planting date | |
| Ready to harvest | 90–150 days after planting | |
| Work it takes | 70–148 days per hectare, by hand | |
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 6 Dec 2026. That is the point in the window where the rains are most reliably established.
This season's rainfall outlook for Chisamba 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 26 Dec 2026 leaves the crop short of season: it runs into the dry months before it has finished filling.
What decides this in Chisamba
| Rain and temperature | 96% |
|---|---|
| The soil | 76% |
| The lie of the land | 96% |
For sweet potato in Chisamba, 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 2026/27 season in Chisamba
| Rainy seasons | One each year — one chance to plant, so timing carries it |
|---|---|
| When the rains are expected | November 2026 to April 2027 |
| Rain in a typical year | About 875 mm |
| This season's rain | Leaning dry — January, February and December 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 +1.5 °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 | 2 kinds of ground. The season below is the largest that farms — about 97% of this area. |
| 97% | enough rain for one short crop, and only if timed to it; warm all year, so nothing but rain ends the season 177 growing days · about 830 mm · November to April |
|---|---|
| 3% | enough rain for one short crop, and only if timed to it; warm all year, so nothing but rain ends the season 177 growing days · about 840 mm · November to April |
last updated 16 September 2026
Frost and pest pressure hold back about 15% of yield here.
What sweet potato needs to grow here
| Soil it likes | well-drained sandy, sandy loam or loam soil |
|---|---|
| Soil sourness (pH) | Happiest between pH 5.0 and 6.5 |
| Rain it needs | About 750–1,000 mm across the season |
| Spacing | 100 cm between rows, 30 cm between plants |
| Feed it most with | potassium and nitrogen |
What it takes to grow sweet potato in Chisamba
| Planting material | About 33,000 plants per hectare |
|---|---|
| Nitrogen (N) | About 93 kg per hectare |
| Phosphate (P₂O₅) | About 35 kg per hectare |
| Potash (K₂O) | About 186 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 | 70–148 days per hectare, by hand |
These are the nutrients a sweet 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 Sweet potato with a plan, not a guess
Everything above describes Chisamba 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 Sweet potato nearby
Sweet 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 sweet potato grow well in Chisamba?
Chisamba rates as favourable for sweet potato.
When should I plant sweet potato in Chisamba?
Typically 6 Dec 2026 to 26 Dec 2026, forecast-adjusted.
Is this exact for my own field?
No — these are readings taken across Chisamba, not on your field. Soil, slope and rainfall change from one farm to the next. Check your own location to see your own numbers.
