Divisi
When to plant Lablab in Idjwi
Sud-Kivu, République démocratique du Congo
Known here as njahi · fiwi · dolique
Lablab (also called hyacinth bean or dolichos; njahi in Swahili) is one of the toughest beans a smallholder can grow.
| Measure | Rain-fed | With irrigation |
|---|---|---|
| Fit | Favourable | |
| When to plant | 1 Sep 2026 – 23 Jan 2027 open now | 21 Jan 2026 – 1 Jan 2027 |
| Expected harvest | about 2.0 t/ha | same |
| Harvest | From 10 Dec 2026 to 22 Jun 2027, depending on the planting date | |
| Ready to harvest | 100–150 days after planting | |
| Work it takes | 75–156 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 11 Jan 2027. That is the point in the window where the rains are most reliably established.
This season's outlook for Idjwi 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 23 Jan 2027 leaves the crop short of season: it runs into the dry months before it has finished filling.
What decides this in Idjwi
| Rain and temperature | 96% |
|---|---|
| The soil | 96% |
| The lie of the land | 96% |
For lablab in Idjwi, rain and temperature is the tightest of the three at 96%. This one is fixed. It is why the planting window above is where it is — hitting those dates is the whole of your control here.
The 2026/27 season in Idjwi
| When the rains are expected | August 2026 to July 2027 |
|---|---|
| Rain in a typical year | About 1,032 mm |
| This season's rain | Leaning wet — January, February, October, 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 | 2 kinds of ground. The season below is the largest that farms — about 72% of this area. |
| 72% | enough rain for a long crop, or two in a year; warm all year, so nothing but rain ends the season 334 growing days · about 1,100 mm · August to July |
|---|---|
| 25% | enough rain for a long crop, or two in a year; warm all year, so nothing but rain ends the season 364 growing days · about 1,260 mm · January to December |
last updated 30 September 2026
Frost and pest pressure hold back about 10% of yield here.
What lablab needs to grow here
| Soil it likes | well-drained sand, sandy loam, loam, clay loam or clay soil |
|---|---|
| Soil sourness (pH) | Happiest between pH 5.0 and 7.5 |
| Spacing | 75 cm between rows, 30 cm between plants |
| Feed it most with | phosphorus |
What it takes to grow lablab in Idjwi
| Nitrogen (N) | About 74 kg per hectare — the crop fixes most of this itself; inoculated seed matters more than a bag |
|---|---|
| Phosphate (P₂O₅) | About 18 kg per hectare |
| Potash (K₂O) | About 26 kg per hectare |
| In the shops | A basal compound at planting — Compound D, or an NPK blend — covers the phosphate and potash. Skip the nitrogen top dressing; inoculated seed does that job. |
| Hand work | 75–156 days per hectare, by hand |
These are the nutrients a lablab 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 Lablab with a plan, not a guess
Everything above describes Idjwi 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.
Lablab 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 lablab grow well in Idjwi?
Idjwi rates as favourable for lablab.
When should I plant lablab in Idjwi?
Typically 1 Sep 2026 to 23 Jan 2027, forecast-adjusted.
Is this exact for my own field?
No — these are readings taken across Idjwi, not on your field. Soil, slope and rainfall change from one farm to the next. Check your own location to see your own numbers.
