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Crop Guide

How to grow watermelon

Fruit · Moderate water needs · Frost-sensitive

Primary source · Iowa State Extension ↗
Watermelon
Moisture range
40–65%
Days to maturity
70–90
Light
Full sun
Growing Degree Units
1500 · base 60°F
When to plant watermelon where you garden
Indoor-start, transplant and harvest dates, counted from your own frost dates.
See planting calendar →
or the link above opens zone 6b to browse.
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Growing notes

Watermelons are warm-season crops that require consistent and abundant moisture but will not tolerate wet conditions. They are more cold-sensitive than cantaloupe and require truly warm soil to thrive.

Harvest signs

underside or 'belly' of the melon turns from a greenish white to buttery yellow or cream, fruit tends to lose its slick appearance on top and becomes dull when ripe, browning of the pig's tail (light green, curly tendril attached to the vine near the melon)

▶Planting reference— Depth, spacing, pH, light
Depth
1 inch deep
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Spacing
2 to 3 feet apart · Rows: 6 to 8 feet apart
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pH range
5.5–7
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Light
Full sun (6+ hr direct)
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▶Pests & diseases— striped cucumber beetles, spotted cucumber beetles, squash vine borers, squash bugs, +8 more
Common pests · 6
Striped cucumber beetles: damage plants by eating leaves as well as flowers, stems, and fruit ↗
Spotted cucumber beetles: feed on all above-ground parts of the plant ↗
Squash vine borers: burrow into the crown and vines of melon plants, causing the entire plant to wilt ↗
Squash bugs: can often be found in large groups, and their feeding gives leaves a ragged appearance ↗
Spider mites: feed on leaves, giving them a bleached or bronzed appearance (During periods of hot, dry weather) ↗
Aphids: leaf curling, discoloration, and sticky leaves ↗
Common diseases · 6
Bacterial wilt: plants suddenly wilt ↗
Powdery mildew: powdery white spots to form on leaves and vines ↗
Cucurbit virus: new growth on the plant is off-color, twisted, or distorted ↗
Anthracnose: large, tan spots on leaves ↗
Angular leaf spot: small, blocky spots on leaves, which are surrounded by a yellow halo ↗
Gummy stem blight and black rot: leaves to brown at the edges and black, rotten areas on melon fruit ↗

Companions & antagonists

Plant near:BeansCorn
Tip: Needs full sun and long warm season - protect from frost.

Common questions

How much water does watermelon need?

Watermelon has middle-of-the-road water needs. Aim to keep soil moisture around 40–65%, letting the top inch dry slightly between waterings rather than staying soggy.

Can I grow watermelon in a raised bed or container?

Watermelon vines and sprawls, so it needs a trellis or plenty of ground room. Only compact varieties really suit containers.

Does watermelon come back every year?

No — watermelon is an annual. It completes its life in one season, so you replant it each year.