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Vegetables

Watermelon

Citrullus lanatus

Watermelon
Photo: Fred Hsu (Wikipedia:User:Fred Hsu on en.wikipedia) · CC BY-SA 3.0 · Wikimedia Commons

A summer cucurbit with large juicy fruit; needs plenty of heat.

Light
Full sun (6 h or more)
Height
0.3 m
Watering
Plenty: almost daily in summer, never waterlogged
Soil
loose and well-drained
Edible?
Yes: the fruit
How to plant
Sow in trays 2 cm deep; plant out at 4–6 leaves, 1.5 m apart.
Care
Deep, regular watering until fruit set, then less. It's ripe when the tendril next to the fruit dries.

Calendar by climate

Warm coast
Mild Mediterranean
Southern interior
Continental interior
Cold interior and uplands
Atlantic
Canary Islands (subtropical)
SowPlantHarvestPruneFeedTreat

Dates are for growing outdoors. You can start seedlings earlier indoors or in a greenhouse, but plant them out only once the frosts are over.

Feeding and doses

Mild Mediterranean

  • CompostMar3–5 kg / m²
  • High-potash liquid feedJun, Jul≈20 ml / 10 L

Pest prevention and doses

Mild Mediterranean

  • Powdery mildewWettable sulphur · Jul2–3 g / L

Approximate doses: always follow the product label. Spray in the evening, never in full sun or on flowers visited by bees. No sulphur above 30 °C.

How easy to grow by climate

  • Warm coastEasy
  • Mild MediterraneanEasy
  • Southern interiorEasy
  • Continental interiorNeeds regular careFrost and a short season
  • Cold interior and uplandsNot recommended outdoorsHard, long frosts
  • AtlanticDifficultRain and humidity: fungal disease
  • Canary Islands (subtropical)Easy

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