Watermelon

Citrullus lanatus

vegetable

verifiedReviewed by the GreenScout Team

Watermelons are warm-season vining crops producing large, round or oblong fruits with sweet, hydrating pink or red flesh and edible seeds or seedless varieties. These heavy feeders require abundant space, warmth, and consistent moisture to develop large, high-quality fruits over a 70–100 day season. Watermelons are nutrient-rich, low-calorie refreshments perfect for summer harvests.

Common Problems

Select the problem your Watermelon is experiencing to get a treatment guide.

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Yellow Leaveschevron_right

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Wiltingchevron_right

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Powdery Mildewchevron_right

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Slow Growthchevron_right

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Holes In Leaveschevron_right

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Brown Spotschevron_right

Care Guide

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Light

Full sun (8+ hours daily); essential for sugar development and optimal ripeness.

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Water

Water consistently, providing 1–2 inches per week; increase frequency during fruit development and hot spells. Reduce water slightly as fruits mature to concentrate sugars. Avoid overhead watering.

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Soil

Well-draining, fertile soil rich in organic matter; pH 6.0–7.0. Amend with aged compost; watermelons require significant nutrients.

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Fertiliser

Apply balanced or slightly high-nitrogen fertilizer at planting; switch to higher phosphorus formula once vines flower and fruit sets.

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Temperature

Warm-season crop requiring soil temps of 70°F (21°C) minimum and air temps of 70–95°F (21–35°C) for optimal growth.

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Humidity

Moderate humidity (50–70%); excellent air circulation prevents fungal diseases. Prune excess foliage if crowded.

Toxicity

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Fully non-toxic; ripe flesh and seeds are safe for all ages.

Common Diseases

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Common Pests

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Seasonal Care

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Resume regular watering and feeding as growth picks up.

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Peak growing season. Water and feed regularly.

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Reduce watering as growth slows. Stop heavy feeding.

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Minimal watering and feeding. Protect from frost if needed.

Similar Plants

potted_plantMelon potted_plantCucumber

Frequently Asked Questions

Why should I reduce watering as my Watermelon ripens?

Reducing water slightly as fruits mature concentrates sugars — too much water late in development dilutes the sweet, hydrating flesh that watermelons are prized for.

How much space and time does Watermelon need?

It's a heavy feeder requiring abundant space, warmth, and consistent moisture over a 70–100 day season — the vigorous vining growth habit means giving each plant several feet of sprawling room.