Divisi
When to plant Roselle in Arusha Urban
Arusha, United Republic of Tanzania
Known here as choya
Roselle — you may know it as bissap, zobo, karkade or sorrel — is a tall, warm-season hibiscus grown for the fleshy red cups (the calyces) that swell at the base of each flower once the petals drop.
| Measure | Rain-fed | With irrigation |
|---|---|---|
| Fit | Favourable | |
| When to plant | 5 Dec 2026 – 25 Dec 2026 opens in 9 weeks | 20 Jul 2026 – 1 Jan 2027 |
| Expected harvest | 0.8–1.0 t/ha | about 1.5 t/ha |
| Harvest | From 4 Apr 2027 to 23 Jun 2027, depending on the planting date | |
| Ready to harvest | 120–180 days after planting | |
| Work it takes | 85–175 days per hectare, by hand | |
| Rain meets its needs | 98% | |
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 25 Dec 2026. That is the point in the window where the rains are most reliably established.
This season's outlook for Arusha Urban 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 25 Dec 2026 leaves the crop short of season: it runs into the dry months before it has finished filling.
What decides this in Arusha Urban
| Rain and temperature | 96% |
|---|---|
| The soil | 76% |
| The lie of the land | 60% |
For roselle in Arusha Urban, 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 Arusha Urban
| Rainy seasons | One each year — one chance to plant, so timing carries it |
|---|---|
| When the rains are expected | October 2026 to July 2027 |
| Rain in a typical year | About 759 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 +1.0 °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 | 4 kinds of ground. The season below is the largest that farms — about 56% of this area. |
| 56% | enough rain for one full main crop; warm all year, so nothing but rain ends the season 229 growing days · about 700 mm · October to June |
|---|---|
| 16% | enough rain for one full main crop; warm all year, so nothing but rain ends the season 237 growing days · about 740 mm · October to June |
| 12% | enough rain for one short crop, and only if timed to it; warm all year, so nothing but rain ends the season 118 growing days · about 600 mm · February to June |
| 12% | enough rain for one short crop, and only if timed to it; warm all year, so nothing but rain ends the season 116 growing days · about 580 mm · February to June |
last updated 16 September 2026
What roselle needs to grow here
| Soil it likes | well-drained sandy loam or loam soil |
|---|---|
| Soil sourness (pH) | Happiest between pH 5.5 and 7.5 |
| Spacing | 80 cm between rows, 60 cm between plants |
| Feed it most with | nitrogen, phosphorus and potassium |
What it takes to grow roselle in Arusha Urban
| Nitrogen (N) | About 40 kg per hectare |
|---|---|
| Phosphate (P₂O₅) | About 15 kg per hectare |
| Potash (K₂O) | About 55 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 | 85–175 days per hectare, by hand |
These are the nutrients a roselle 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 Roselle with a plan, not a guess
Everything above describes Arusha Urban 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.
Roselle 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 roselle grow well in Arusha Urban?
Arusha Urban rates as favourable for roselle.
When should I plant roselle in Arusha Urban?
Typically 5 Dec 2026 to 25 Dec 2026, forecast-adjusted.
Is this exact for my own field?
No — these are readings taken across Arusha Urban, not on your field. Soil, slope and rainfall change from one farm to the next. Check your own location to see your own numbers.
