Can i plant onions and potatoes together


Potato Companion Plants: Spud Buddies

Table of Contents

Potatoes are a staple food in many places around the world. This starchy tuber can be fried, mashed, baked, roasted, or grilled to create various dishes. Potatoes are highly recommended if you’re growing your own food because they’re easy to grow and store over winter. Fortunately for gardeners, there are many potato companion plants that are good to grow with potatoes that will help make your experience more enjoyable.

Companion plants for potatoes are responsible for deterring pests, attracting beneficial insects, adding nutrients to the ground, and improving flavor. Remember that potatoes grow deep underground, so when you’re choosing companion plants, you should avoid plants with deep roots and opt for ones that are shallow-rooted so they won’t disturb the growth of the tubers.

Companion planting with potatoes is easy once you know all the dos and don’ts. Let’s get into all the plants you should plant with your potatoes and which plants to avoid.

What Is Companion Planting?

Which potato companion plants are best for you? Source: mcav0y

Companion planting is strategically putting plants next to each other so they can benefit each other. It has been used for years and likely traces back to ancient times. It’s often used today among organic gardeners because it offers many benefits without using chemicals or genetically modified crops.

The benefits of companion planting will depend on each plant and what they can do for other plants. For example, potatoes benefit from having nitrogen in the soil, so planting a nitrogen-fixing plant near potatoes is a smart choice.

Many gardeners use flowers as companion plants to attract pollinators to the garden. Food won’t grow without pollinators, so adding a companion plant or two (or ten!) will improve your yield. Flowers will also attract beneficial insects that eat pests, so you won’t have to worry about resorting to chemicals.

You can also use companion planting to make your life easier. You can plant tall and sturdy plants near vining plants to have a natural trellis. Sunflowers and corn make excellent trellises for peas or beans. You can also use fast-growing plants as row markers by planting them on the end of your rows. This will help you easily identify where you put seeds to avoid accidentally double-plant in the space.

Good Potato Companion Plants

Chives have shallow roots and can help repel some pests. Source: Mary

Now that we have looked into the benefits of companion plants in general, let’s look at which plants are good companion plants for potatoes.

First, think about how potatoes grow. They have leaves above the ground, and the roots and potato tubers grow deep underneath the soil. The roots are mostly above the tubers, allowing for some free space right above the soil level.

Good companion plants have shallow roots that won’t interfere with the potatoes. Companion plants should be planted next to potatoes so there won’t be any interference, but it’s always best to avoid any potential issues. Some good shallow root options include a variety of herbs, including chives, basil, and parsley. 

Brassicas such as broccoli, cabbage, Napa cabbage, collard greens, cauliflower, kale, and kohlrabi also have shallow roots that will cooperate with potatoes. Some sources advise against planting brassicas near potatoes because they make the soil alkaline; however, it shouldn’t be an issue if your soil is neutral or slightly acidic. Leafy greens, including spinach and lettuce, also have short roots that won’t compete. The potato leaves will benefit the lettuce because they’ll provide shade to prevent the lettuce from burning.

Potatoes planted next to bush and pole beans, fava beans, peas, and lentils will grow bigger, taste better, and produce a bigger yield. Legumes are nitrogen-fixing plants, which means they deposit nitrogen into the soil. Potatoes benefit from nitrogen, so these plants are a good choice. Stray away from planting peanuts, however, because those can grow up to three feet deep into the soil, which could stunt the growth of your potatoes as they’ll have to compete for space.

Potatoes are susceptible to Colorado potato beetles and other harmful insects. Planting flowers and certain herbs will help deter harmful insects and attract beneficial ones that will eat pests. Herbs such as cilantro and thyme are great for drawing in the good bugs. Catnip attracts beneficial insects, too, but it also attracts cats which may see your crop of potatoes as a litter box or bed. Sage and mint deter pests, including flea beetles, but these are invasive and will quickly take over your potato bed. Try planting these in containers so you can keep them under control.

There are so many beneficial flowers for potatoes that it’s hard to list them all! Alyssum, petunia, chamomile, yarrow, borage, lovage, and calendula all attract beneficial insects. Sunflowers attract pollinators like bees, so it’s great to have them near potatoes, too. Flax and marigold repel potato beetles, so they’re excellent companion crops to plant around the potato bed. Nasturtium functions as a trap crop, which attracts pests that like potato plants. Plant nasturtium close enough to the potatoes that you can attract them but not close enough that they’ll wander away from the flowers.

A few vegetables that are good to grow alongside potatoes include corn, leeks, onions, garlic, and radishes. Corn can improve the flavor of potatoes, leeks and radishes have shallow roots so they don’t compete, and onions and garlic ward off pests. Companion vegetables are ideal in organic gardening because they allow you to make the most of your space.

Don’t forget that your potato plants may actually help other types of plants, too. A good plant for potatoes to be near is beans as the potatoes repel Mexican bean beetles. In fact, while the potato crop is dealing with the Mexican bean beetles, your beans that grow alongside them will be reducing the Colorado potato beetle population, making both your potato crop and your bean crop better overall by lessening the pressures of insect pests.

What Not To Plant With Potatoes

Daikon radishes have large roots that compete with potatoes for space. Source: detsugu

There are plenty of good neighbors for potato plants, but there are also combinations that you should avoid. Bad companions can allow diseases to spread quickly, compete for nutrients, overtake the bed, and cause the potatoes to be misshapen.

When it comes to potatoes, you should avoid planting near other solanaceous plants, which are plants that are in the nightshade family. Potatoes are related to eggplants, tomatoes, and peppers. These plants are all susceptible to blight, leaf spot, and mosaic viruses. When they’re planted closely together, they can quickly transmit the disease to each other, resulting in the loss of a lot of crops. If one of these crops becomes infested with pests, those will easily hop from crop to crop, and they’ll become more challenging to get rid of. Other plants that aren’t in the nightshade family are also susceptible to blight and other diseases, such as apple, peach, cherry, and other stone fruit trees, as well as raspberry bushes.

Pumpkins and other squash will compete for nutrients with your potatoes, so avoid planting potatoes near these crops. Cucumbers and related plants such as cantaloupe or watermelon require lots of water and will fight over it with your potatoes. They’ll likely grow around the potato plants and eventually choke them out.

Fennel is allelopathic, meaning it can interfere with plant growth. They can make potatoes small and misshapen, stunt the growth, or they can cause them to stop growing completely. Fennel attracts beneficial insects and repels fleas, so they’re good to have in the garden, but it’s best if you grow them in a container instead of near your potatoes. 

We mentioned before that deep-rooted plants shouldn’t be grown with potatoes because they inhibit their growth. Vegetable root crops to avoid include Daikon radish, carrots, turnips, rutabagas, and parsnips. Asparagus should also be avoided because it has a large root system. Horseradish is a great pest preventative, but the size of the large horseradish root can be a problem.

Finally, as a general rule of thumb, plants to avoid include those that have different growing condition requirements. Potatoes prefer loose soil so they can easily grow. They’re susceptible to root rot, so the soil needs to be slightly dry. Growing plants that prefer more compact soil or lots of water won’t be good companions for your potato crop.

Frequently Asked Questions

Potato plants don’t mind shallow-rooted neighbors. Source: Mullica

Q: Can I plant potatoes near tomatoes?

A: Potato plants and tomatoes should be at least 6 feet away from each other. They are both in the nightshade family, so they’re susceptible to the same diseases and pests. When they’re put together in the same space, the likelihood of having a pest or disease outbreak is much higher. 

Q: How many potatoes do you get per plant?

A: Expect to get 5-10 potatoes per plant. You may have a few large ones and several small ones on each plant. The yield is dependent on many factors, including the variety of potatoes, how many eyes are on a seed potato, the quality of soil, and the amount of water it gets. If potatoes are grown with a companion plant, you may see an increase in yield. But if you grow potatoes near plants that aren’t recommended, you may see a smaller yield or smaller potatoes.

30 Potato Companion Plants And 8 Plants To Never Grow With Potatoes

19196 shares

Potatoes are a staple crop on many temperate climate homesteads. Potatoes are generally a relatively easy (though space consuming) crop to grow.

Get it right when it comes to choosing and growing potatoes and you can enjoy your own home grown potatoes all year round – especially if you learn how to store them for many months.

As you will find out in this article, there are a number of ways to boost your potato harvest – but choosing the right companion plants is our number one tip.  

Top Tips To Boost Your Potato Harvest

We have plenty of tips when it comes to getting the most from your potato harvest. General tips for a good potato harvest include:

But perhaps the best way to boost your potato yield this year is to stop growing potatoes in their own, separate bed.

Instead, choose companion plants for potatoes, to create polycultures or guilds around them to help them grow strong.  

To find out more about companion plants and why we use them, check out my article on companion plants for tomatoes. In that article, you’ll find out more about how and why we use companion plants and create polycultures in an organic garden. 

But which companion plants should you choose to grow alongside your potatoes?

Read on for some suggestions.

Vegetables to Plant Alongside Potatoes

First of all, let’s take a look at some of the other annual vegetables (and legumes) that could be grown alongside your potatoes:

1. Horseradish

Horseradish is a perennial root vegetable grown for its fiery flavour. But another reason to grow it is to give potatoes a helping hand.

Horseradish grown around the edges of your potato growing area is said to increase the disease resistance of your potato plants.

It is also believed to repel the potato bug, potato beetles, aphids, whiteflies and some caterpillars.

While these claims have little scientific backing, there is a wealth of anecdotal evidence from gardeners and growers who swear to its efficacy.

There is also some evidence to suggest that incorporating the organic material from horseradish plants into the soil around potatoes can, in certain circumstances, have pest controlling characteristics.

It is the compound allyl isothiocyanate found in the plant which is said to have pest repelling properties. (It is also this oil which gives the plant its peppery taste.)

(Note, however, that horseradish is a member of the brassica plant family and can harbor common brassica pests, so should not be grown close to cabbages, kale, broccoli or other members of this plant family.)

2. Garlic

Planting garlic around the potato bed may also be efficacious in repelling certain pests.

The pungent aroma of the garlic is said to repel certain species, and to confuse or distract others, making the primary plants in the bed more difficult for pests to find.

Intercropping potatoes with garlic was also found to be more effective than fungicidal treatments for the control of late blight in this study.  

3. Onions

Onions have also been found to be efficacious against certain insects when intercropped with potatoes in certain studies.

Again, the strong smell of this allium may help to reduce insect damage on your potato plants. 

4. Scallions/ Green Onions/ Spring Onions

Scallions, green onions or spring onions are an allium that could be particularly useful for growing alongside potatoes in a home setting, because they are small and can easily be incorporated between rows of potatoes being earthed up in a traditional way, and along the edges of growing areas.

Note, however, that alliums are believed to suppress the growth of legumes such as peas and beans.

So while, as you will see below, alliums and legumes can both be potentially beneficial for potatoes, both should not be included in the same polyculture.

5. Peas

Peas are a nitrogen fixing legume, and as such, may be helpful to potatoes, which have relatively high nitrogen needs.

Studies have suggested that yield on a certain area of land can be increased by intercropping of these two plants.

In a warm climate, during hot summer weather, pea crops planted to provide shade to potatoes may also have a benefit, since the increased shade will reduce moisture loss from the soil and aid the potato crop, which requires relatively high levels of water.

Peas have also been shown to reduce the incidence of Colorado potato beetles.

6. Beans

Beans may also provide similar benefits to potatoes as peas. Both as a nitrogen fixing plant, and as a shade provider.

Studies into intercropping of beans and potatoes have shown that in certain circumstances, overall yield can be increased on a given area of land by planting the two together.

7. Corn

In a warm climate, growing corn on the sunny southern side of your potatoes could also bring benefits through providing shade for this cool climate crop.

The shade will help reduce water evaporation from the soil, which can help make sure potatoes have enough water and will grow well and taste good upon harvest.

8. Lettuce

Finally, it is also worthwhile considering crops that, while they may not help the potatoes themselves, will help increase the yield on your property without affecting your potato crop.

Lettuce is one shallow-rooted, fast growing crop that can be sown between potatoes. It grows fast enough that it can be harvested before competition becomes an issue.

9. Spinach

Spinach is another example of a leafy green with shallow roots that can be sown around your potatoes early in the season.

Sowing lettuce, spinach and other similar leafy greens will help you to make the most of the space you have available.

Another benefit of sowing leafy greens like lettuce and spinach around young potato plants is that they can help to create good ground cover, which is another way to reduce moisture loss.

It can also help to reduce the incidence of weeds that may compete for nutrients with your potato plants.

10. Radishes

Radishes are another great space-filling crop. These too have relatively shallow roots and are fast-growing.

So again, you can enjoy a harvest from between your potato plants before they grow to fill the space and require the room and nutrients available.

Radishes can also help the potatoes and the leafy greens planted alongside them by repelling flea beetles.

Herbs That Make Good Companion Plants for Potatoes

It is important to think about vegetables and legumes that could be sown and grown alongside potatoes.

As mentioned above, these can aid the potatoes and make the most of the space available. But it is also a great idea to think about adding aromatic herbs around your potato plants. 

Some aromatic herbs that could make good companions for potatoes include:

11. Thyme

Thyme is a good companion for potatoes on the plate, but also in the garden.

Primarily, thyme is a good companion for potatoes because it is particularly good at attracting hoverflies/ Syrphidae which reduce aphid numbers through predation.

It can also spread to create good ground cover.

Thyme likes much drier conditions than potatoes, but could work well elevated on the southern side of potato mounds, for example, where it can enjoy the sunnier and drier conditions it needs.

Even better, harvest some thyme leaves ad sprinkle on your roast potatoes for a delicious flavor combo.

12. Yarrow

This is another perennial herb that can work very well as a companion plant to many other crops.

Yarrow also attracts a range of beneficial insects, and its deep roots mean that it can be an effective dynamic accumulator. When later chopped and dropped around potato plants, it can help to deliver the nutrients they need.

Yarrow helps break up the soil, and potatoes can benefit from this.

They do best in soil that is not too compacted. Yarrow grown as a companion alongside other aromatic herbs can also help increase their essential oil production, which can boost their pest-repelling or confusing properties.  

13. Chamomile

Grown alongside other companion herbs, chamomile also increases their oil production. It also attracts a range of beneficial insects, including hoverflies and predatory wasps.

14. Basil

Basil is a herb that can do well when grown alongside potatoes. It can thrive in the somewhat moist environment beneath your more mature potato plants.

It repels certain common pests, including thrips, flies and hornworms.

15. Parsley

Parsley is another herb that enjoys the moist soil around potato plants.

It attracts certain beneficial insects, and acts as a trap crop for insects that feed on potato plants (as well as tomato plants and other members of the same family).

16. Sage

Sage is another aromatic herb that helps vegetables by attracting honeybees and other pollinators, and may also help potatoes by keeping flea beetles away.

17. Catmint

Catmint also has deterrent properties for certain pests. Some gardeners swear that catmint is one plant that can help to deter potato beetles, for example.

18. Tansy

Tansy is another herb that may help keep potato beetles at bay. Again, this is a herb that can also attract certain beneficial wildlife.

19. Cilantro

Likewise, cilantro is another crop to plant in a fight against potato beetles. Cilantro also attracts hoverflies which can aid in reducing pest populations.

20. Lovage

Lovage improves the health of almost all plants grown nearby as a companion plant.

It is also especially good at attracting beneficial insects such as bees and other pollinators, as well as certain wasps and beetles.

Flowers That Make Good Companion Plants for Potatoes

Finally, it is also a good idea to think about the flowers that it is beneficial to grow alongside potatoes. Flowers that can be great companions for potatoes include:

21. Marigolds

Marigolds are an important companion plant that are beneficial when planted throughout your garden.

Check out this article on growing marigolds in the vegetable garden to find out more about this wonderful flower and the many reasons to grow it in your garden.  

22. Calendula

Calendula (also called pot marigold) should not be confused with the above. But this too can be a useful companion plant.

Largely for its wildlife attracting properties, calendula can also be a great choice for potato polycultures. 

23. Nasturtiums

Nasturtiums are another multi-purpose companion plant that you can use as a good companion for a range of commonly cultivated fruits and vegetables.

More commonly, you will use them as companions for cucurbits such as cucumbers and squash, or other summer crops like tomatoes.

But the same reasons that make them good companions for these plants also make them good companions for potatoes.

Check out my article on reasons to grow nasturtiums in your garden to find out more. 

24. Borage

Borage is another flowering plant that you should consider sowing and growing throughout your garden.

It can be beneficial in a forest garden or fruit tree guild, or in an annual vegetable plot.

Around your potatoes, it can help as a dynamic accumulator, and can help maintain fertility and retain moisture for your crop when chopped and dropped.

It can also help by attracting a range of beneficial insects when in flower. 

Here’s a lot more reasons why you should grow borage.

25. Petunias

These pungent, sweet smelling flowers may protect potatoes from certain pests such as leafhoppers.

26. Alyssum

Alyssum can create excellent ground cover around your potato plants.

These flowers not only look pretty, and help retain soil moisture, they are also excellent at attracting predatory wasps that eat insect pests that might plague your potatoes.

27. Clover

Clover, like peas and beans, is a nitrogen fixing plant. It can also help potatoes by providing good ground cover around the plants during the warmth of summer.

When in flower, both white and red clover varieties attract pollinators but also a range of other beneficial insects.

28. Vetch

Vetch is another nitrogen fixing plant and, again, you can intercrop it with potatoes or use it to create good ground cover.

Again, this can help to reduce soil moisture loss and reduce can also help to reduce the incidence of weeds.

29. Dead Nettle

Some weeds, however, can be a good thing, and this is well worth remembering.

One weed that can be beneficial to potatoes is dead nettle (lamium).

Dead nettles may improve the taste and vigour of potato plants growing nearby and might also help in repelling certain pests.

30. Flax

Finally, flax may improve potato plants’ growth and flavour. It may also deter potato bugs. 

8 Plants To Avoid Planting Near Potatoes

What you avoid planting near potatoes can be just as important as what you do grow near them.

Here are some of the plants which do not make good companions for your potato plants:

1. Brassicas

Since horseradish is such a good companion for potatoes, many other brassicas (members of the cabbage family) are often recommended for growth alongside them.

But while this plant family is often recommended for growth alongside potatoes, it is not really a good idea.

The primary reason why it is not a good idea to include brassicas and potatoes in the same growing area is that they do not enjoy the same conditions.

While they do have similar water and nutrient needs, brassicas will do best in a somewhat more alkaline environment.

Potatoes, on the other hand, grow best in slightly acidic soil.

The mulches you choose for these plants can be used to influence this factor, and help to prevent problems such as root knot in brassicas and scab in potatoes.

When you grow them together, the different needs will be much harder to meet.

2. Tomatoes (And Other Members of the Nightshade Family)

Potatoes are part of the same plant family as tomatoes, peppers and aubergines.

The problem will growing potatoes close to or with other members of this family is that pests and diseases spread easily between them.

Don’t grow them together, or plant them in the same bed following one another. Try to keep a good crop rotation system in play when it comes to this plant family. 

3. Cucumbers and Squash

It is also a good idea to keep cucumbers, squash and other members of the cucurbit family away from your potatoes, since these can make your potatoes more susceptible to blight.

These are also, like potatoes, ‘hungry’ plants, and can compete with the potato plants for water and nutrients.

4. Raspberries

Keep raspberries well away from your potato plants too. Since these too can increase the chances of a problem with blight and other potato diseases.

5. Carrots

Carrots are another crop that are not beneficial close to potatoes.

For one thing, the carrots and potatoes do not share the same environmental needs. Carrots can cope with far drier conditions than potatoes.

Carrots may also stunt the growth and development of potato tubers.

But mostly, the problem is that the disruption involved in harvesting potatoes can damage and disrupt the carrot crop nearby. (The same goes for several other root crops.)

6. Asparagus

Growing asparagus in the same bed as potatoes is also a no-go.

Some say that the asparagus will compete with the potatoes and stunt their growth and development.

But the main issue is that asparagus, as a perennial crop, has an extensive root formation that will be damaged by the earth movement required in potato growing and harvesting.

7. Sunflowers

Sunflowers can have allelopathic effect, which means they excrete chemicals which can inhibit seed germination and stunt the growth of certain other crops grown close by.

Growing sunflowers near potatoes may result in smaller and misshapen potato tubers.

So while sunflowers can be great companions for corn and other crops – keep them away from your potatoes.

8. Fennel

Finally, fennel is another allelopathic plant. It can stunt the growth of a wide range of commonly cultivated crops.

So you should keep fennel away from other plants that are affected by the chemicals it excretes.

Place it where it can attract beneficial insects without having a detrimental effect.

Examples of Potato Polycultures

It is important to remember, when planning your garden, that companion planting is by no means an exact science.

A huge range of factors contribute to the interactions between plants.

Where you live will have an influence on which combinations work well, so experimentation is definitely in order. 

In order to further help you to come up with successful guilds in your garden, here are examples of the potato polycultures that work well for me where I live:

I plant potatoes in my polytunnel early in the spring. Soon after the potato plants emerge, I companion plant with: 

All of which will be harvested before the potatoes grow to fill the space. I also place marigolds along the edge of the bed as soon as the weather warms sufficiently.

These remain in place after the potatoes have been harvested, when the potatoes are replaced by summer beans and more leafy salad crops. 

I also grow potatoes outdoors. I plant these a little later in the spring alongside:

Once the potatoes are ready for harvest, the peas and beans are chopped, leaving the roots in place. And the borage is chopped and dropped.

I add additional mulch to the zone, ready for the next phase of planting.

Of course, these are just examples of what I have found works well for me.

Be sure to experiment with plant combinations to see which work best for you, where you live.

But remember, integration is always better than segregation when it comes to the plants that you grow. 

Read Next:

19196 shares

What can be planted next to potatoes and what can be planted after it? in 2022 on GoodGrunt

Content