Why Potato Leaves Turn Yellow (and What to Do)
Potato leaves turning yellow is a common concern during the growing season. In many cases, yellowing leaves are a natural part of plant growth, but they can also be caused by watering, nutrients, or weather conditions.
Looking at when the leaves turn yellow and how the plant is growing overall can help identify the cause.
Most potato plants continue growing normally once conditions improve.
Natural yellowing before harvest
Potato plants often begin to turn yellow as they reach the end of their growing cycle.
This usually happens when:
plants stop growing
leaves fade and die back
potatoes underground are ready to harvest
This is completely normal.
For harvesting advice, see when to harvest potatoes.
Overwatering
Too much water can cause leaves to turn pale or yellow.
Waterlogged soil makes it difficult for roots to absorb nutrients.
Good drainage helps prevent this.
Allow soil to dry slightly between watering.
For watering advice, see how often to water potatoes.
Underwatering
Dry soil can also cause potato leaves to yellow and wilt.
Potatoes need steady moisture while growing.
Watering deeply during dry weather usually helps plants recover.
Nutrient deficiency
Potatoes grow quickly and need nutrients in the soil.
Poor soil or lack of compost can sometimes cause yellow leaves.
Adding compost before planting usually improves growth.
You can read more in best soil for vegetable gardening in the UK.
Cold weather stress
Potatoes can be affected by cold conditions, especially early in the season.
Leaves may yellow slightly during cold weather but often recover as temperatures rise.
When to worry
You may need to investigate further if:
many leaves turn yellow quickly
plants stop growing
leaves develop spots or damage
Most potato plants remain healthy with steady watering and good soil.
For growing advice, see how to grow potatoes in the UK
Potato plants often recover
Yellow leaves don’t always mean something is wrong.
As potato plants mature, some yellowing is expected.
With consistent care, potatoes usually continue developing underground.