Watermelon (Citrullus lanatus)

Watermelon

Citrullus lanatus

Juicy summer staple with trailing vines and large edible fruits. Trailing annual vine; common name: watermelon.

Full sun
2–3/week
Moderate
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Plant Needs

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Sunlight Full direct sunlight for 8–10 hours daily to support fruit development; partial shade reduces yield and delays ripening
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Watering Water deeply at the base during fruit formation; avoid wetting foliage to minimize fungal disease risk
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Temperature Requires warm temperatures above 18°C for germination and growth; sensitive to frost and temperatures below 15°C
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Characteristics

  • Leaf: Large, deeply lobed, hairy triangular-ovate leaves with rough, textured surfaces
  • Flower: Small yellow monoecious flowers (separate male and female blooms on the same vine)
  • Fruit: Large fleshy berry with thick green rind and sweet, watery red, pink, or orange flesh (cultivar-dependent)
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Care Guide

Watering

Keep soil consistently moist during vine growth and fruit set; reduce watering as fruits mature to improve sweetness

Fertilization

Apply balanced compost or diluted organic feed at planting. Avoid over-fertilizing with nitrogen, which promotes excessive foliage growth over fruit production

Banana peel compost tea:Fully compost banana peels to eliminate odor; dilute 1:20 with water for root drenching to enhance fruit sweetness and vine health
Pruning
  • Pinch off lateral side vines to focus energy on the main vine and developing fruits
  • Remove yellowing, diseased, or damaged leaves to improve airflow and reduce fungal disease risk
  • Trim excess foliage around maturing fruits to increase sun exposure and speed ripening
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA confirms no toxicity; small amounts of flesh are safe as occasional treats

Humans: No known toxicity to humans; all edible parts (flesh, seeds, rind) are safe for consumption when ripe

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Garden Uses & Culture

Culture: Symbolizes summer refreshment, abundance, and casual outdoor gatherings in Western cultures

Usage: Edible sweet flesh for fresh consumption; roasted seeds as a savory snack; rind can be pickled for culinary use