Leek companion plants are a great way to add several benefits to your vegetable garden. Growing leeks is a good choice for any garden because of their visual appeal and characteristics.

Leek Companion Plants for Garden

But limit yourself to only planting leeks when you have a plethora of options to choose from as companion plants for them.

Companion planting will bring in its own list of benefits and will help leeks with their growth and protection against pests without any harmful effects.

Types of Leek Companion Plants

1. Carrots

Carrots are an excellent option for leek companion planting. They are a crucial component of many dishes as well. Which means that, having fresh carrots at home is a perfect opportunity to have.

White Flowers of Carrots

Leeks and carrots have a unique, mutually beneficial relationship with each other, where they both help fend off diseases and pests.

– Characteristics

Carrots and Leek are a perfect match, not only because of their looks but also their compatibility. Both vegetables are very susceptible to many diseases and help each other keep them safe. Carrots repel onion flies and leek moths, and leeks can fend off carrot rust flies. Thus, both plants are safer in each other’s company, and that is what features an exceptional characteristic.

In addition to the awesome benefit of safety, carrots are also said to enhance leeks’ flavor, which gives us another reason to plant this tasty vegetable. These biennial vegetables are generally harvested in the first year of their growth, and then they produce a flower the following year, and they will be the ones to boost each other’s growth.

The foliage of these vegetables is also unique that has a fern-like appearance, and they produce five-petaled flowers that come in unique clusters called umbels. Like many other plants, carrots seeds are planted in early spring after the last frost, and it can take up to 75 days for them to be ready for harvest, which is a great period.

– Growth Requirements

Carrots grow best in loose and well-draining soil. Make sure there are no rocks or hard clumps because they can cause the roots to break. These root vegetables would also prefer soil that is on the acidic side.

Although a significant portion of the vegetable is underground, the foliage prefers sunlight to grow. Carrots need full to partial sun for their roots to grow healthily. It is a good idea to water carrots once a week, and you can use mulch to avoid dryness in the soil.

2. Chili Peppers

Like carrots, chili peppers are another excellent companion vegetable for leeks in your garden. They will help to grow leeks in a safer environment while also benefiting from their presence. Chilies are also a great way to add interest to your garden due to their striking colors of yellow and red.

Red Chili Peppers

These green vegetables together with some leeks keep each other safe from pests that are dangerous to them. Aphids and ants are a significant threat to chili plants, and leeks are a great way to keep them at bay. 

– Characteristics

Alternatively, chili peppers are an exquisite defense against pests that attack the leek plants. Companion planting is a great way to enhance the flavor, growth, and yield of the vegetable while also protecting it against pests, local wildlife, and diseases.

Another great benefit from this companionship is that chili pepper plants can easily fill up the empty spaces in your garden, as leeks take up very little space. It not only helps you fill the open patches but is also a great way to take advantage of your garden space in the form of more vegetables and spices.

Chili peppers also come in abundant varieties, and you have a plethora of options that you can choose from. Some varieties are known for their spice levels, while others are more on the ornamental side and produce colorful flowers and foliage. Which basically shows that, there is no shortage of options to pick and decide to meet your aesthetic and culinary needs.

– Growth Requirements

Chili peppers prefer nutrient-rich loamy soil that is well-draining. Richer soil mixtures will help add to the taste and appearance of the vegetables. They also prefer a soil of acidic nature, and this is how they would thrive.

Moreover, remember that when you are planting these vegetables, they like to grow under full sun, with some varieties requiring hot and consistent sunlight to grow to their full potential. Which means that, they are an excellent option for an outdoor leek garden.

Regular watering to keep even moisture in the soil is the ideal condition for growth. Avoid complete dryness or waterlogging, as it will harm the plant. In some instances, irregular watering can shock the plant.

3. Strawberries

Strawberries are a tasty delicacy that will grow happily in the company of leeks in your garden.

Farming Strawberries in Field

Strawberries are probably one of the most well-known fruits in every part of the world, loved for their juicy taste and bright red or sometimes white color. These fruit-bearing plants are great companions to many other plants, including leeks.

– Characteristics

They are not just an excellent option to increase the garden’s visual appeal, but they are also a great delicacy that you would love to have fresh at home. The best part is they are relatively easy to grow and maintain.

Their growth and yield will depend on the climate conditions of your area, as they would vine throughout different seasons and even start to show their fruit in February.

Although they are not very picky about their surroundings, you still have to provide them with basic needs for them to grow and bear fruit. If your local area has a short growing season, you may have to wait until the following year to reap the fruits of your labor.

Strawberries are perennial plants which means that they will bear fruit every year to provide you with delicious berries. On the other hand, it is a good idea to plant and grow them with care in their first year of growth. Initially, you can plant strawberries indoors in early spring and transfer them outdoors when the last spring frost has passed.

– Growth Requirements

Strawberries prefer rich, moist, and well-draining soil to help them get their desired nutrients. You can also add fertilizers to meet their requirements if the need arises. You must make sure that you keep weeds out of the surrounding soil, which would mean that they do not compete for nutrients and moisture.

Most species of strawberries require full sun to thrive and produce abundant fruit. Although, excessive exposure can result in the fruit getting sun burnt.

Strawberries are among the plants that regular plentiful and regular watering to prosper. Especially during the summer months or when they are bearing fruits, keep them watered regularly for best results.

4. Brassicas

Brassicas like cauliflower and kale are great options as companion plants in leek gardens, basically they are ones from the same family. These vegetables are a key component in various dishes and can quickly grow in the company of leeks.

Harvesting Brassicas

The Brassica family also includes broccoli, cabbage, and turnips. Which means that, there are many options for you.

– Characteristics

Cauliflower is a great vegetable to cultivate and harvest. It is a versatile vegetable that finds value in many different cuisines around the globe, as it is famously used in different cuisines. In addition, this is because they are found in different regions.

Likewise, kale is a cabbage that is primarily cultivated for its edible leaves. They have green or purple leaves, and the central leaves do not form a “head,” as with the cauliflower. Kale is considered to be the closest one to wild cabbage as compared to other members of the brassica family.

Different brassica family members come with individual benefits that are worth considering during your decision-making process. For example, cauliflowers need different climate conditions to survive depending on the variety, while kale plants are frost-resistant and will continue to grow even in harsh weather conditions.

– Growth Requirements

These vegetables are ones that would need moist, rich, and well-draining soil to grow healthy. To determine your local soil conditions, it can be a good idea to send your garden soil for testing to determine its compatibility.

Brassicas need light and temperature conditions depending on the plant you will choose. Some need regular sunlight, while others will grow better in partial shade and colder climates.

On the other hand, these plants prefer regular moisture in the soil through regular watering but avoid water logging as it can cause root rot. Complete dryness can lead to the vegetables turning bitter or not producing healthy leaves.

5. Rosemary

Rosemary is an edible herb that can work as an excellent companion plant for leeks. Rosemary is native to the Mediterranean region. Their leaves and oil are essential components for medical and culinary purposes.

Growing Rosemary Plants

For medical uses, rosemary is good for hair growth, and rosemary extract can be used as a sunblock.

– Characteristics

In the world of cuisines, rosemary is used primarily for its flavor, as it would match different types of meat. The leaves can be used to make herbal tea. They are also cooked alongside meats and vegetables to give the dish a strong aroma. Growing rosemary in your garden allows you to try new dishes right at home.

The culinary benefits are not the only ones that rosemary will introduce to your garden. They are also a great way to enhance the visuals of your garden.

The plants have straight stems filled with thin, needle-like leaves that are gray-green in color. The plan also produces tiny white or light blue flowers that are a beautiful sight every time to enter your garden, and they would fulfil the whole garden.

Rosemary is a low-maintenance plant. It requires trimming, especially after the flowers bloom, to encourage growth. You can replant these trimmings to grow more plants instead of throwing them away. This characteristic will help you propagate the growth of your plants without much hassle or the need to buy more seeds.

– Growth Requirements

Rosemary prefers moist but well-draining soil. They also like soil that ranges from acidic to neutral in nature. Moreover, it is also crucial that you would place it in a well-lit area which wold be the best ones to grow rosemary as they require abundant light. They do not tolerate shade, so keep this in mind when planting your seeds.

Rosemary has good drought tolerance once it is mature but requires water during its growth, but water logging is very dangerous, especially for young plants. It is better for the plant to be under-watered compared to over-watering.

6. Marigolds

Marigolds are bedding flowers and are among the most common and reliable of the group. These flowering plants produce warm colors and blooms, adding interest and appeal to any area they appear in. 

Multi Color Marigolds

These daisy-like flowers come in a range of sizes and colors; some are small single-petal flowers like signet marigolds, while others, like African marigolds, are large double-petal flowers.

– Characteristics

Marigolds are excellent companion plants in a leek garden. These beautiful flowers are often talked about as a great option for keeping away all pests.

And although some of these stories may be exaggerated, they would even can keep many harmful soil-borne pests away from the area, especially root-knot nematodes that can be a significant threat. As a result, you can always plant leeks alongside them, and they are quite safe.

The roots of these flowering plants secret a chemical that keeps soil pests away from them and the plants in their vicinity. Any variety of this plant will provide you with this benefit, and you can plant them as close to leek plants as possible, to sum it up, they will not affect the growth of their neighbors in any way.

These plants can grow easily from seeds, and they take only a couple of months before they are ready to bloom. Typically, they are planted in early spring after the soil the prepared to be worked, but if you want early outdoor bloom, you can plant them indoors and grow them about six weeks before the last frost.

– Growth Requirements

Lean, moist, and well-draining soil is the best to grow marigolds, but they are easily grown in wide different soil varieties. Make sure the soil is not too acidic, and you should be good to go. They also do not need nutrient-rich soil.

Like other flowering plants, the best results are obtained by planting marigolds under the full sun. It will result in abundant plants that are healthy and vibrant. Shady conditions can hinder the growth of plants.

In the early stages, marigolds need regular watering, but once they have established their root system, they are relatively resistant to droughts. But for the absolute best results, you should water them every week.


Leek companion plants are a great option to get more value out of your garden space while providing benefits to the garden and the owner. They can give tasty edibles, exciting visuals, and defense mechanisms against many pests in your garden.

If you are looking into companion planting with leeks, keep in mind the following:

  • Many of these plants provide a great defense mechanism against pests and diseases.
  • They mostly require similar growing conditions and do not require extra hassle to grow and maintain.
  • Most plants produce edible vegetables and fruits, while some provide vibrant visuals.

Leek companions are the perfect way to use your garden space fully. Leeks are already an excellent vegetable on their own, but adding companion plants would give you more variety visually and from a harvesting perspective. So, which of these companion plants did you choose for your garden?

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