Divisi
When to plant Mandarin in Sao Tome and Principe
The mandarin (also called tangerine or naartjie) is the hardiest and easiest-to-peel of the citrus trees — a small, spreading evergreen that lives and bears fruit for decades.
| Measure | Rain-fed | With irrigation |
|---|---|---|
| Fit | Favourable | |
| When to plant (establish) | 20 Jul 2026 – 21 May 2027 open now | 21 Jan 2026 – 1 Jan 2027 |
| Expected harvest | about 16.1 t/ha | about 32.3 t/ha |
| Work it takes | 91–203 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 Sao Tome and Principe 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 21 May 2027 leaves the crop short of season: it runs into the dry months before it has finished filling.
What decides this in Sao Tome and Principe
| Rain and temperature | 96% |
|---|---|
| The soil | 76% |
| The lie of the land | 45% |
For mandarin in Sao Tome and Principe, 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 Sao Tome and Principe
| When the rains are expected | August 2026 to July 2027 |
|---|---|
| Rain in a typical year | About 1,877 mm in a typical farming district |
| Across its districts | From about 1,692 mm in the driest of 7 districts to about 2,625 mm in the wettest |
| This season's rain | Leaning dry — January, February, September, October, November 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. |
| 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 one typical farming district's, not a figure for the whole of this area. |
| 68% | enough rain for a long crop, or two in a year; warm all year, so nothing but rain ends the season 365 growing days · about 2,800 mm · January to December |
|---|---|
| 32% | enough rain for a long crop, or two in a year; warm all year, so nothing but rain ends the season 365 growing days · about 2,580 mm · January to December |
last updated 18 September 2026 · from all 7 areas within it
What mandarin needs to grow here
| Soil it likes | well-drained loam or sandy loam soil |
|---|---|
| Soil sourness (pH) | Happiest between pH 6.0 and 6.5 |
| Spacing | 550 cm between rows, 550 cm between plants |
| Feed it most with | nitrogen, potassium, magnesium, zinc and boron |
What it takes to grow mandarin in Sao Tome and Principe
| Planting material | About 340 plants per hectare |
|---|---|
| Nitrogen (N) | About 32 kg per hectare |
| Phosphate (P₂O₅) | About 6 kg per hectare |
| Potash (K₂O) | About 40 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 | 91–203 days per hectare, by hand |
These are the nutrients a mandarin 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 Mandarin with a plan, not a guess
Everything above describes Sao Tome and Principe 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.
Mandarin 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 mandarin grow well in Sao Tome and Principe?
Sao Tome and Principe rates as favourable for mandarin.
When should I plant mandarin in Sao Tome and Principe?
Typically 20 Jul 2026 to 21 May 2027, forecast-adjusted.
Is this exact for my own field?
No — these are readings taken across Sao Tome and Principe, not on your field. Soil, slope and rainfall change from one farm to the next. Check your own location to see your own numbers.
