Watermelon (Citrullus lanatus) — Plotwright

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Watermelon

Habit (mature) · Stefan.lefnaer / Wikimedia Commons · CC BY-SA 4.0

Limited coverage

Watermelon

Citrullus lanatus

A sprawling annual vine from southwestern Africa, grown the world over for its sweet, juicy summer fruit. Hairy, prostrate stems clad with curly tendrils run 10 feet or more across the ground, carrying deeply pinnately-lobed leaves and small pale-green flowers. It needs long, hot summers and rich, consistently moist, well-drained soil; bees are required to pollinate the female flowers and set the spherical-to-oval, dark-striped melons.

Review: Source-backed

Climate fit: moderate (63/100)

Edible

Light

Full sun

Water

Consistent moisture

Mature size

9-18" tall · 84" apart

Hardy in zones

2-11

brutally cold to nearly frost-free winters

Summer heat range

Warm-Extreme

warm to extreme summers Interim Plotwright tier until the plant AHS range is authored.

Native in Illinois

No

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Missouri Botanical Garden PlantFinder lists Citrullus lanatus for USDA zones 2 to 11, grown as a warm-season annual in full sun with medium water; it thrives in long, hot summers and is intolerant of wet soils.

Climate notes

Cold hardiness

Now

Zone 6b

USDA

Chicago, IL · 1991-2020 average annual coldest day

Source: USDA Plant Hardiness Zone Map 2023 (1991-2020 climatology) via ArcGIS FeatureServer

Well-suited

2050

Zone 7b

Plotwright

Your zone + climate-model shift · SSP3-7.0 (regional rivalry)

Well-suited

In plain terms: cold winters — coldest nights typically around -3°F.

✓

Well-suited today and still thriving in 2050.

Heat tolerance

°C

°F

Loading current AHS heat-zone and plant heat-fit data at your coordinates…

Where this plant fits

Suitable across 45 ecoregions — 45 climate-resilient through 2070. Best matches first.

Appalachian mixed mesophytic forests

Appalachian-Blue Ridge forests

Arizona Mountains forests

Atlantic coastal pine barrens

Blue Mountains forests

California coastal sage and chaparral

Canadian Aspen forests and parklands

Central Pacific Northwest coastal forests

Central Tallgrass prairie

Central-Southern Cascades Forests

Sources & citations

Cite this page

For lesson plans, articles, or research that uses this page. To cite a single upstream fact instead, use its specific source listed below.

Plotwright. (2026, May 17). Watermelon (Citrullus lanatus). Retrieved 2026, June 5, from https://plotwright.garden/plants/watermelon

Sources for every fact

Every fact on this page traces to a source. 18 fields cited — 18 source-backed.

Missouri Botanical Garden PlantFinder

Botanical research database

Backs 17 fields

Identity

Summary

Plant type

Light

Moisture

Hardiness

Heat zone

Size

Spacing

Habit

Design roles

Seasonal interest

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Lifecycle

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Designer notes

Wikimedia Commons

Photo · CC BY-SA 4.0

Backs 1 field

Image

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The photos above are our reviewed reference set, curated for accuracy.

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