Divisi
When to plant Watermelon in Ulanga
Morogoro, United Republic of Tanzania
Known here as tikiti maji
Watermelon is a warm-season trailing vine, grown flat along the ground for its big, sweet, thirst-quenching fruit — a cousin of pumpkin, cucumber and melon.
| Measure | Rain-fed | With irrigation |
|---|---|---|
| Fit | Favourable | |
| When to plant | 7 Nov 2026 – 21 Apr 2027 opens in 5 weeks | 21 Jan 2026 – 1 Jan 2027 |
| Expected harvest | about 22.2 t/ha | about 34.2 t/ha |
| Harvest | From 26 Jan 2027 to 9 Aug 2027, depending on the planting date | |
| Ready to harvest | 80–110 days after planting | |
| Work it takes | 46–96 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 1 Jan 2027. That is the point in the window where the rains are most reliably established.
This season's rainfall outlook for Ulanga is close to normal, so these dates match the pattern the area usually follows.
Planting after 21 Apr 2027 leaves the crop short of season: it runs into the dry months before it has finished filling.
What decides this in Ulanga
| Rain and temperature | 96% |
|---|---|
| The soil | 76% |
| The lie of the land | 45% |
For watermelon in Ulanga, the lie of the land is the tightest of the three at 45%. 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 Ulanga
| Rainy seasons | One each year — one chance to plant, so timing carries it |
|---|---|
| When the rains are expected | November 2026 to July 2027 |
| Rain in a typical year | About 1,418 mm |
| This season's rain | Rain close to usual — plan around about 1,418 mm falling roughly when it always does |
| This season's heat | Hotter than usual — about +1.4 °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 full main crop, warm all year, so nothing but rain ends the season |
| Ground this covers | One kind of ground throughout. |
last updated 16 September 2026
Sloping ground holds back about 35% of yield here.
What watermelon 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 | 240 cm between rows, 140 cm between plants |
| Feed it most with | potassium, boron and calcium |
What it takes to grow watermelon in Ulanga
| Planting material | About 4,000 plants per hectare |
|---|---|
| Nitrogen (N) | About 49 kg per hectare |
| Phosphate (P₂O₅) | About 13 kg per hectare |
| Potash (K₂O) | About 71 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 | 46–96 days per hectare, by hand |
These are the nutrients a watermelon 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 Watermelon with a plan, not a guess
Everything above describes Ulanga 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.
Watermelon 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 watermelon grow well in Ulanga?
Ulanga rates as favourable for watermelon.
When should I plant watermelon in Ulanga?
Typically 7 Nov 2026 to 21 Apr 2027, forecast-adjusted.
Is this exact for my own field?
No — these are readings taken across Ulanga, not on your field. Soil, slope and rainfall change from one farm to the next. Check your own location to see your own numbers.
