Divisi
When to plant Yam in Kamonyi
Southern Province, Rwanda
Yam is a climbing vine that grows one big food tuber underground over a long 7-11 month season.
| Measure | Rain-fed | With irrigation |
|---|---|---|
| Fit | Favourable | |
| When to plant | 10 Sep 2026 – 20 Oct 2026 open now | 21 Jan 2026 – 1 Jan 2027 |
| Expected harvest | about 19.6 t/ha | about 8.5 t/ha |
| Harvest | From 9 Mar 2027 to 15 Sep 2027, depending on the planting date | |
| Ready to harvest | 180–330 days after planting | |
| Rain meets its needs | 96% | |
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 20 Sep 2026. That is the point in the window where the rains are most reliably established.
This season's outlook for Kamonyi leans wet. Plant at the early end of the window, and make sure water can drain off the field — a wet year does more damage through waterlogging than through the rain itself.
Planting after 20 Oct 2026 leaves the crop short of season: it runs into the dry months before it has finished filling.
What decides this in Kamonyi
| Rain and temperature | 96% |
|---|---|
| The soil | 76% |
| The lie of the land | 60% |
For yam in Kamonyi, the lie of the land is the tightest of the three at 60%. 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 Kamonyi
| When the rains are expected | August 2026 to July 2027 |
|---|---|
| Rain in a typical year | About 1,005 mm |
| This season's rain | Leaning wet — January, February, November and December look heavier than usual. Make sure water can drain off the field; a wet year does more damage through waterlogging and disease than through the rain itself. |
| 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 a long crop, or two in a year, warm all year, so nothing but rain ends the season |
| Ground this covers | 4 kinds of ground. The season below is the largest that farms — about 41% of this area. |
| 41% | enough rain for a long crop, or two in a year; warm all year, so nothing but rain ends the season 314 growing days · about 980 mm · August to June |
|---|---|
| 31% | enough rain for a long crop, or two in a year; warm all year, so nothing but rain ends the season 291 growing days · about 870 mm · September to June |
| 14% | enough rain for a long crop, or two in a year; warm all year, so nothing but rain ends the season 298 growing days · about 910 mm · August to June |
| 8% | enough rain for a long crop, or two in a year; warm all year, so nothing but rain ends the season 321 growing days · about 1,010 mm · August to July |
last updated 17 September 2026
What yam needs to grow here
| Soil it likes | well-drained sandy loam or loam soil |
|---|---|
| Soil sourness (pH) | Happiest between pH 5.5 and 7.0 |
| Spacing | 100 cm between rows, 100 cm between plants |
| Feed it most with | nitrogen and potassium |
What it takes to grow yam in Kamonyi
| Planting material | About 10,000 plants per hectare |
|---|---|
| Nitrogen (N) | About 74 kg per hectare |
| Phosphate (P₂O₅) | About 22 kg per hectare |
| Potash (K₂O) | About 113 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 yam 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 Yam with a plan, not a guess
Everything above describes Kamonyi 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.
Yam 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 yam grow well in Kamonyi?
Kamonyi rates as favourable for yam.
When should I plant yam in Kamonyi?
Typically 10 Sep 2026 to 20 Oct 2026, forecast-adjusted.
Is this exact for my own field?
No — these are readings taken across Kamonyi, not on your field. Soil, slope and rainfall change from one farm to the next. Check your own location to see your own numbers.
