Maintain even moisture, especially from the time after the flowers bloom. Potatoes need 1 to 2 inches of water a week. Too much water right after planting and not enough as the potatoes begin to form can cause them to become misshapen. Stop watering when the foliage begins to turn yellow and die off.
How much water do potato plants need?
Generally, potatoes need between 1-2 inches of water per week; this could be provided by rain events or you to make up the difference. Water needs for your crop throughout its life goes a little something like this…
Can potatoes get too much water?
Risks of over-watering potatoes When more water is applied than the crop needs and the soil can absorb, the result is a lack of oxygen for root respiration. This slows plant growth, increases the likelihood of rot, and can be highly detrimental to yield and quality.
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