Divisi
When to plant Watermelon in Arris
Batna, Algeria
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.
| Fit | Moderate |
|---|---|
| When to plant | 10 Jun 2027 – 30 Jun 2027 opens in 36 weeks |
| Expected harvest | about 18.4 t/ha |
| Harvest | From 29 Aug 2027 to 18 Oct 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 30 Jun 2027. That is the point in the window where the rains are most reliably established.
This season's rainfall outlook for Arris is close to normal, so these dates match the pattern the area usually follows.
Planting after 30 Jun 2027 leaves the crop short of season: it runs into the dry months before it has finished filling.
What decides this in Arris
| Rain and temperature | 88% |
|---|---|
| The soil | 96% |
| The lie of the land | 30% |
For watermelon in Arris, the lie of the land is the tightest of the three at 30%. 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 season in Arris
| Rain in a typical year | About 451 mm |
|---|---|
| This season's rain | Rain close to usual — plan around about 451 mm falling roughly when it always does |
| What that supports | enough rain for one short crop, and only if timed to it, cool for part of the year, so frost sets the planting date |
| Ground this covers | 3 kinds of ground. The season below is the largest that farms — about 85% of this area. |
| 85% | enough rain for one short crop, and only if timed to it; cool for part of the year, so frost sets the planting date 118 growing days · about 420 mm |
|---|---|
| 10% | enough rain for one short crop, and only if timed to it; warm, with a cool spell that slows winter growth 136 growing days · about 310 mm · October to March |
| 5% | enough rain for one short crop, and only if timed to it; cool for part of the year, so frost sets the planting date 156 growing days · about 330 mm · October to March |
last updated 15 September 2026
Sloping ground holds back about 65% 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 Arris
| Planting material | About 4,000 plants per hectare |
|---|---|
| Nitrogen (N) | About 40 kg per hectare |
| Phosphate (P₂O₅) | About 11 kg per hectare |
| Potash (K₂O) | About 59 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 Arris 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.
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 Arris?
Arris rates as moderate for watermelon.
When should I plant watermelon in Arris?
Typically 10 Jun 2027 to 30 Jun 2027, forecast-adjusted.
Is this exact for my own field?
No — these are readings taken across Arris, not on your field. Soil, slope and rainfall change from one farm to the next. Check your own location to see your own numbers.