Why Are There Berries Growing on Your Potato Plants?

Growing potatoes in your home garden can be a fun and rewarding experience. But what happens if you start to notice berries growing on your potato plants? You may wonder why this is happening and what, if anything, you should do about it.

Berries on potato plants are a sign that the plant is stressed. This can be caused by several factors, including disease, pests, or weather. If you notice berries on your potato plants, it’s important to look closely and see if you can identify the cause.

Once you’ve determined the cause of the berries, you can take steps to address them. In this article, I’ll discuss some of the most common reasons for berries on potato plants and what you can do to fix the problem.

Reasons for Berries on Potato Plants

There are a few reasons why your potato plant may be producing berries.

The most common ones include:

1. Diseases

Diseases can cause stress to your potato plants, which can make them produce small, off-color berries. Some of the most common diseases that affect potatoes are early blight, late blight, and Verticillium wilt. 

These diseases can be caused by fungi or bacteria and spread through the soil, water, or your gardening tools. If your potato is infected with a disease, you’ll likely see other symptoms, such as discolored leaves or stems and berries

Your potato may produce berries as a way to spread the disease to other plants. This is most common with early and late blight, two diseases that can cause serious problems for potato crops.

Berries are also a way for the plant to save itself from disease or pests. If a potato plant is infested with aphids, the plant may produce more berries in an attempt to save itself.

The same goes for if the plant is infected with a virus. By producing more berries, the plant can spread its pollen and seeds to other areas, increasing the chances of survival.

2. Pests

Potatoes are also susceptible to pests, such as aphids, Colorado potato beetles, and cutworms. These pests can damage your potato plants’ leaves, stems, and flowers. 

In some cases, the damage is so severe that the plant produces berries for self-defense. The berries are a self-defense mechanism produced by the plant to try and spread the pest or disease to other plants.


Aphids, in particular, are known for causing stress to plants. They feed on the sap of the plant, weakening it and making it more susceptible to disease. 

Colorado Potato Beetles

Colorado potato beetles are another common pest that can damage potato plants. These beetles feast on the plant leaves, which can eventually kill the plant.


Cutworms are the larvae of moths, and they feed on the leaves and stems of plants. If enough cutworms are present, they can destroy a potato crop.

3. Improper Care

Taking care of your potato plants is important to prevent stress and disease. Common mistakes include planting the potatoes too early, not thinning the plants, and not providing enough water.

If you plant the potatoes too early, they may be exposed to frost, damaging the plants. This can cause the plants to produce berries as a way to try and survive.

Not thinning the potato plants can also lead to stress. When the plants are too close, they compete for resources and sunlight. This can cause the leaves to turn yellow and the plant to produce berries.

Not providing enough water can also cause stress to the plants. Potato plants need about an inch of water per week. If they don’t get enough water, the leaves will start to turn brown and wilt. And it will produce berries.

You must take care of your potato plants to prevent them from producing berries. This includes planting them at the right time, thinning them properly, and providing enough water.

If you plan on growing your potatoes in a container, you should read my complete guide on the topic. You’ll learn how to keep your potatoes healthy in a small area: How to Grow Potatoes in a Container (Complete Guide)

4. Genetic Mutations

The genetic makeup of a potato can be altered in several ways:

Crossing Over

The crossing-over process occurs during meiosis, during which chromosome crossovers are sometimes probable. This can lead to the exchange of genetic material between chromosomes and create new combinations of genes.

The new species will still have 48 chromosomes, but it will visibly differ from the rest of your crops.


A mutation is a change in the DNA sequence of a gene. Mutations can be caused by environmental factors such as UV light or radiation, or they can occur spontaneously. When a mutation occurs, it can alter the function of the gene.

In some cases, a mutation can result in a plant producing berries. For example, the mutation could cause the plant to produce a hormone stimulating fruit growth. The hormone could also cause the plant to produce more seeds, which would be contained in the berries.

While mutations are usually considered harmful, in this case, the mutation is beneficial to the plant. The plant can produce more seeds, which increases its chances of survival and reproduction.

These mutations are often harmless. In some cases, however, the berries can be poisonous. They contain solanine, a toxic compound that can cause gastrointestinal distress.

If you come across a potato plant with berries, it’s best to err on the side of caution and not eat them.

5. Environmental Stressors

A few environmental stressors can cause a potato plant to produce berries:

Lack of Pollination

When a potato blossom is not pollinated, it can turn into a small berry. This usually happens when there are not enough bees around to do the job. Pollination is essential for potato plants because it helps them produce bigger and healthier crops.

Too Much Nitrogen

If your potato plants are getting too much nitrogen, they may produce lots of leaves but produce few potatoes or flowers. The flowers that do form may turn into berries.

Nitrogen encourages vegetative growth at the expense of reproductive growth. To determine whether this is the cause of the issue, make sure to get your soil tested.

Cold Weather

Berries can also form on potato plants that have been damaged by cold weather. This usually happens when the plants are exposed to frost or temperatures below 50 °F (10 °C). Ideally, potatoes should be kept at a temperature range that varies between 61 and 66 °F (6-19 °C).

Drought Stress

Potato plants need a lot of water to thrive. If they don’t get enough, the leaves will wilt, and the plant will go into survival mode. One way they do so is by producing berries instead of flowers or potatoes.

However, make sure not to swing the pendulum to the other extreme and overwater your plants either, as that can quickly lead to root rot.

How to Prevent Berries on Your Potato Plants

If you notice that your potato plants are producing berries, there is no need to worry. This is a natural phenomenon that can occur under certain conditions. However, if you prefer that your plants do not produce berries, you can try to alleviate the stressors.

Here are a few things that you can do:

1. Adequate Watering

If you are in an area prone to drought, ensure that you provide your plants with enough water. This will help reduce the plant’s stress and prevent it from producing berries. To promote a healthy root system, you should also water your plants regularly and deeply.

Adequate watering is especially important during the flowering and fruiting stages. If the plant does not have enough water during these stages, it may produce small, hard berries.

2. Use Mulch

Mulch can help to retain moisture in the soil and prevent the plant from suffering from drought stress. This will also help keep the plant’s roots cool and prevent the plant from producing berries.

Mulch is also beneficial in several other ways.

It helps prevent weeds from competing with the potato plant for water and nutrients. The plant is more likely to produce berries when competing for these things.

Mulch also helps the soil temperature cool. The mulch will help keep the plant’s roots cool and prevent the plant from producing berries.

Adding mulch may also help to prevent erosion and soil compaction. Erosion and compaction take away the resources that the plant needs to survive. This may cause the plant to produce berries in an attempt to reproduce.

You can use several different mulch types, such as straw, wood chips, or leaves.

3. Proper Fertilization

Fertilizing your potato plants will help to provide them with the nutrients they need to grow a healthy crop. You should fertilize your potato plant at the beginning of the growing season and every few weeks throughout the season.

You should balance the nitrogen, phosphorus, and potassium you use. Too much of any of these nutrients can cause problems for the plant. For example, too much nitrogen can cause the plant to produce excessive foliage and not enough potatoes.

If you notice that your potato plant is producing berries, it may be a sign that it is lacking in nutrients. In this case, you should fertilize your plant more frequently.

There are several different fertilizers that you can use, such as manure, compost, bone meal, or inorganic fertilizer.


Your potato plants may produce berries for several reasons. The most common one is environmental stress. However, if you take steps to reduce the stress on your plant, you can prevent it from producing berries moving forward.

Some things you can do to reduce the stress on your plant include adequate watering, using mulch, and proper fertilization. By taking these steps, you can help your plant to grow a healthy crop of potatoes.

Dr. Moritz Picot

Dr. Moritz Picot is a horticulture enthusiast and the founder of TheGrowingLeaf.com, where he serves as the lead content writer. He established the website in 2022 as a valuable resource for both gardening aficionados and beginners, compiling all the gardening tips he has accumulated over the past 25 years. Alex has a passion for nurturing plants, transforming backyards into inviting spaces, and sharing his knowledge with the world.

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