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How Often To Water Watermelon?
Water watermelon deeply 1 to 2 times a week, 1 to 2 inches in total, then ease off near harvest. Learn how steady water builds sweet, crisp fruit.
Water watermelon deeply 1 to 2 times a week, giving 1 to 2 inches of water in total. Plants need the most water while vines grow and fruit sets. Cut back in the last week or two before harvest, because less water then keeps the flesh crisp and the flavor concentrated.
A starting point, not a rule. Check the soil before each watering and stretch the gap in cool, cloudy weather.
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A watermelon is about 92 percent water, and the plant works hard to deliver it. Few garden crops are as thirsty, and few reward good watering as clearly.
Watermelon vines have deep roots, often 2 to 3 feet, but most of the feeder roots sit in the top foot. That means they do best with deep, regular soaks. Your job is to keep the soil evenly moist while the vines and fruit grow, then ease off as the melons ripen.
Watermelon watering schedule
| Growth stage | How often |
|---|---|
| Seeds and seedlings | Every 1 to 2 days, lightly |
| Vines spreading | Once a week, about 1 inch |
| Flowering and fruit set | 1 to 2 times a week, deeply |
| Fruit swelling, hot weather | 2 times a week, up to 2 inches total |
| Last 1 to 2 weeks before harvest | Only if the vines wilt |
Count rain. Sandy soil drains fast and may need more frequent watering.
How to tell when watermelon needs water
Push a trowel 3 to 4 inches into the soil near the base of the vine. If it is dry at that depth, water. The top inch dries quickly under the big leaves.
Watermelon leaves wilt in the afternoon heat, then recover by evening. If they are still limp in the morning, water now.
How to water watermelon
- Water at the base. Keep the leaves dry to help prevent powdery mildew and other leaf diseases.
- Water deeply. Soak the soil 8 to 12 inches down, so roots grow deep.
- Water in the morning. Plants are ready for the heat and leaves dry before night.
- Mulch under the vines. Straw keeps the soil moist and keeps the fruit off damp ground.
Signs of overwatering and underwatering
Too much water
- Yellow leaves on lush vines
- Bland, watery fruit
- Fruit that cracks or splits
- Rotting fruit where it touches the soil
Too little water
- Vines wilted in the morning
- Small, misshapen melons
- Flowers dropping without setting fruit
- Hollow or dry flesh inside
Easing off before harvest
As the melons reach full size, cut back on watering. Drier soil in the last week or two helps keep the flesh crisp and the sugar concentrated, while heavy watering dilutes the flavor.
Ripe melons have a creamy yellow spot where they rested on the ground, a dried curly tendril next to the stem, and a hollow sound when tapped. Watermelon is a close cousin of cucumbers and pumpkins. For the rest of the bed, see our vegetable garden guide.
Watermelon watering FAQ
How much water does a watermelon plant need?
About 1 to 2 inches a week, including rain, with the most needed while the vines grow and the fruit swells.
Should I stop watering watermelon before harvest?
Cut back in the last 1 to 2 weeks. Drier soil keeps the flesh crisp and the flavor stronger.
Can you overwater watermelon?
Yes. Too much water gives bland, watery fruit and invites rot and cracking. Water deeply, then let the top few inches dry slightly.
We turn horticulture research and real growing experience into plain-English watering schedules you can actually follow.