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How Often To Water Potatoes?
Water potatoes 1 to 2 times a week, about 1 to 2 inches a week, with the most care while they flower. Learn when to stop so tubers store well.
Water potatoes 1 to 2 times a week, giving about 1 to 2 inches of water each week. Steady moisture matters most from flowering until the plants start to yellow, when the tubers form and swell. Stop watering about 2 weeks before harvest so the skins toughen.
A starting point, not a rule. Check the soil before each watering and stretch the gap in cool, cloudy weather.
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Potatoes are easy to grow and hard to grow well. The difference between a basket of smooth, even spuds and a pile of knobby, cracked ones usually comes down to water.
Potatoes form their tubers underground in a short window, starting around the time the plants flower. During that time, the soil needs to stay evenly moist. Your job is to water lightly at first, steadily through tuber growth, then stop before harvest.
Potato watering schedule
| Growth stage | How often |
|---|---|
| Seed potatoes just planted | Only if the soil is dry |
| Shoots up to flowering | Once a week, about 1 inch |
| Flowering and tuber growth | 1 to 2 times a week, 1 to 2 inches total |
| In grow bags or containers | Every 1 to 3 days in summer |
| Leaves yellowing, 2 weeks before harvest | Stop watering |
Count rain. In a wet summer, potatoes in the ground may need very little extra water.
How to tell when potatoes need water
Push a finger or trowel 3 to 4 inches into the hill beside a plant. If the soil is dry at that depth, water. If it is cool and damp, wait.
Thirsty plants wilt during the day and may look dull. Do not wait for wilting during flowering, though. By then the tubers have already felt the stress.
How to water potatoes
- Water at the base of the hills. A soaker hose along the row works well and keeps leaves dry.
- Water deeply. Soak the soil 6 to 8 inches down, where the tubers are growing.
- Water in the morning. Leaves that dry quickly are less likely to get blight.
- Mulch the hills. Straw keeps the soil moist, cool and even, and it shades tubers from the sun.
Signs of overwatering and underwatering
Too much water
- Yellow leaves early in the season
- Seed potatoes rotting before shoots appear
- Soft, rotting tubers at harvest
- Enlarged white bumps on the skins
Too little water
- Plants wilting by midday
- Small tubers and low yield
- Rough, scabby skin
- Knobby or oddly shaped potatoes
When to stop watering potatoes
As the season ends, the leaves turn yellow and the plants begin to die back. That is your signal to stop watering. Drier soil in the last 2 weeks helps the skins thicken, so the potatoes store longer and bruise less.
For new potatoes, the small, tender ones, you can dig a few while the plants are still green and keep watering the rest.
Sweet potatoes are a different plant with a different routine, covered in our sweet potatoes guide. For the rest of your beds, see the vegetable garden.
Potatoes watering FAQ
Should I water potatoes every day?
No, unless they are in small containers in hot weather. Potatoes in the ground do best with 1 to 2 deep waterings a week.
Do potatoes need a lot of water?
A moderate amount, about 1 to 2 inches a week. They need it most while flowering and forming tubers.
When should I stop watering potatoes?
When the leaves start turning yellow, about 2 weeks before harvest. Drier soil helps the skins toughen for storage.
We turn horticulture research and real growing experience into plain-English watering schedules you can actually follow.