Companion planting is an age-old gardening practice where certain plants are grown near each other for mutual benefit. Some plants naturally boost each other’s growth by enriching the soil with essential nutrients, making the surrounding environment more fertile and productive for their neighbors.
Some plants act as natural pest repellents, releasing scents or compounds that deter harmful insects, protecting more vulnerable plants nearby. This reduces the need for chemical pesticides and creates a healthier, more balanced garden ecosystem.
Certain plants attract beneficial insects like bees and butterflies, improving pollination for surrounding plants and boosting overall garden yields. Others provide natural shade or act as ground cover, helping to retain moisture and suppress weeds that would otherwise compete for resources.
Understanding which plants thrive together comes down to observing their individual needs — sunlight, water, soil type, and growth habits. When these needs complement rather than compete with each other, plants grow stronger, produce more, and create a self-sustaining garden that works with nature rather than against it.
Best Vegetables to Plant Together
Tomatoes and Basil
Tomatoes and basil are perhaps the most celebrated companion planting pair in the vegetable garden, and their friendship extends well beyond the kitchen. Basil is believed to repel aphids, whiteflies, and tomato hornworms when planted nearby, while many gardeners swear that it improves the flavor of tomatoes grown in close proximity. The two plants also share similar growing requirements — full sun, warm temperatures, and rich, well-drained soil — making them natural neighbors in any summer garden bed.
Corn, Beans, and Squash (The Three Sisters)
The Three Sisters is one of the oldest and most successful companion planting systems in the world, developed by Native American peoples over thousands of years. Corn provides a natural trellis for climbing beans to grow up, beans fix nitrogen from the air into the soil to feed the corn and squash, and the large leaves of squash spread across the ground to suppress weeds and retain soil moisture. Together the three crops support and benefit each other so effectively that they produce far higher yields when grown together than when grown separately.
Carrots and Onions
Carrots and onions are a classic companion planting duo that work together by confusing and repelling each other’s most troublesome pests. The strong scent of onions masks the smell of carrots from carrot flies, while the sharp aroma of carrots deters onion flies in return. They also have very different root systems, with onions forming bulbs near the soil surface while carrots dive deep, meaning the two crops compete very little for space or nutrients underground.
Lettuce and Tall Vegetables
Lettuce is a cool-season crop that quickly bolts and turns bitter when exposed to intense summer heat, making it an ideal companion for taller vegetables such as tomatoes, corn, or pole beans. The tall plants cast gentle, dappled shade over the lettuce during the hottest part of the day, extending its productive season well into summer. In return, the dense, low-growing lettuce acts as a living mulch beneath the taller plants, suppressing weeds and helping the soil retain moisture.
Cucumbers and Radishes
Radishes are remarkably useful companions for cucumbers, primarily because they act as a trap crop for cucumber beetles, drawing the destructive insects away from the cucumber plants. Radishes grow and mature so quickly that they can be harvested and replaced several times during a single cucumber growing season. The two crops also complement each other spatially, with radishes occupying the spaces between slower-developing cucumber plants in the early weeks of the season.
Peppers and Carrots
Peppers and carrots make surprisingly good garden companions, as carrots help loosen and aerate the soil around pepper roots through their downward growth, improving drainage and soil structure. Peppers in return provide some dappled overhead shade to the carrot tops in hot weather, which helps keep the soil cooler and moister. Both crops thrive in similar conditions of full sun and fertile, well-drained soil, and they share the bed without significant competition for resources.
Brassicas and Dill
Brassicas, which include cabbage, broccoli, kale, cauliflower, and Brussels sprouts, benefit tremendously from having dill planted nearby. Dill attracts an array of beneficial insects including parasitic wasps and lacewings that feed on the cabbageworms, aphids, and other pests that plague the brassica family throughout the growing season. It is worth noting, however, that dill should not be allowed to flower near tomatoes or carrots, so positioning it specifically with the brassicas keeps everyone happy.
Spinach and Strawberries
Spinach and strawberries are a wonderfully productive pairing that makes excellent use of limited garden space. The strawberry plants spread low and wide, shading the soil beneath them and keeping it cool and moist — conditions that spinach particularly enjoys. Spinach, in return, acts as a ground-cover companion that suppresses weeds between strawberry plants, and the two crops can be harvested at similar times in the cool seasons of spring and autumn.
Beans and Potatoes
Beans and potatoes have long been grown together with mutual benefit, as beans fix atmospheric nitrogen into the soil which feeds the heavy-feeding potato plants nearby. Beans are also said to repel the Colorado potato beetle, one of the most destructive potato pests in the garden. Potatoes in turn provide some degree of protection to beans by repelling the Mexican bean beetle, making this a genuinely two-way beneficial relationship.
Garlic and Roses (and Most Vegetables)
Garlic is one of the most broadly useful companion plants in the vegetable garden, repelling a wide range of insect pests including aphids, spider mites, Japanese beetles, and cabbage loopers with its powerful sulfurous scent. Planted at the base of roses, fruit trees, and throughout the vegetable garden, it acts as a natural pest deterrent without harming the plants around it. It takes up very little space, matures in late spring or early summer, and leaves behind sulfur-enriched soil that benefits many subsequent crops.
Peas and Mint
Peas enjoy the company of mint, which repels aphids and other soft-bodied insects that frequently attack the tender stems and leaves of pea plants. Mint’s strongly aromatic foliage confuses and deters pests throughout the growing season, and it thrives in the cool, moist conditions that peas also prefer in spring. It is wise to grow mint in a sunken container nearby rather than directly in the bed, as it spreads aggressively and can quickly overwhelm neighboring crops if left unchecked.
Cabbage and Chamomile
Chamomile is a gentle but effective companion for cabbage and other brassicas, attracting beneficial hoverflies and parasitic wasps that prey on the caterpillars and aphids that so frequently devastate cabbage crops. It also improves the growth of nearby plants through chemicals released from its roots, and its cheerful daisy-like flowers bring pollinating insects into the vegetable garden throughout the season. Chamomile self-seeds reliably year after year, so once established it provides its benefits with no effort from the gardener.
Zucchini and Nasturtiums
Nasturtiums are excellent companions for zucchini and other squash family members, acting as a trap crop that lures aphids, whiteflies, and squash bugs away from the main crop. Their sprawling growth also covers the soil around squash plants, suppressing weeds and retaining moisture during the heat of summer. As an added bonus, nasturtium flowers and leaves are edible with a pleasant peppery flavor, making them a productive as well as functional member of the vegetable garden.
Leeks and Celery
Leeks and celery are mutually beneficial companions that both thrive in similar conditions of moist, rich soil and full sun. Leeks are said to repel the carrot fly, which also attacks celery, while celery in turn deters the leek moth and other leek pests with its strong aromatic compounds. The two crops grow upright and relatively narrow, making them space-efficient neighbors that can be planted in alternating rows without either shading out or competing excessively with the other.
Tomatoes and Marigolds
French marigolds are among the most widely recommended companion plants for tomatoes, and their reputation is well earned. Their roots secrete a substance that kills soil nematodes, which are microscopic worms that damage tomato root systems, and their pungent scent deters whiteflies, aphids, and other flying pests above ground. Planting marigolds as a border around tomato beds or interplanted throughout them provides both above-ground and below-ground protection throughout the entire growing season.
Beets and Kohlrabi
Beets and kohlrabi are exceptionally compatible growing companions that thrive in similar conditions and complement each other well in the garden bed. Beets add minerals, particularly magnesium, to the soil through their decomposing leaves, which benefits the kohlrabi growing beside them. Both crops are cool-season vegetables that can be planted together in spring and autumn, and their different growth habits — beets forming roots below ground and kohlrabi forming swollen stems above — mean they occupy different physical spaces and compete very little.
Sweet Corn and Cucumbers
Sweet corn and cucumbers make a productive pairing in the summer garden, with cucumbers benefiting from the wind protection and partial shade provided by the tall corn stalks during the hottest periods of summer. The cucumbers spread across the ground between the corn rows, acting as a living mulch that retains moisture and suppresses weeds in the spaces between the tall plants. This vertical and horizontal division of growing space makes the combination highly efficient for gardeners working with limited room.
Kale and Herbs
Kale grows particularly well when surrounded by strongly aromatic herbs such as sage, rosemary, and thyme, which confuse and repel the cabbage moths and cabbage white butterflies that are drawn to the brassica family. The herbs thrive in the slightly richer, moister soil that kale prefers, and their dense, low growth covers the ground between kale plants effectively. The combination of kale and herbs also makes practical sense for the kitchen gardener, as both crops are harvested repeatedly over a long growing season.
Pumpkins and Corn
Pumpkins and corn have been grown together in traditional agricultural systems for centuries, with pumpkins spreading their large, prickly-leafed vines across the ground between corn stalks to form a dense, weed-suppressing carpet. The shade created by the pumpkin leaves keeps the soil moist and cool beneath the corn plants during summer heat, reducing the need for supplemental irrigation. Corn’s height and root depth mean it takes its nutrition from different parts of the soil than the sprawling pumpkin plants, minimizing competition between the two crops.
Asparagus and Tomatoes
Asparagus and tomatoes are long-term companions that benefit each other over several growing seasons in a permanent garden bed. Tomatoes repel asparagus beetles with their foliage, while asparagus roots produce a substance called asparagine that kills certain soil nematodes harmful to tomatoes. Since asparagus is a perennial crop that occupies the same bed for twenty years or more, and tomatoes are planted annually in the beds around it, the two crops form a productive and mutually supportive partnership over the long term.
Radishes and Spinach
Radishes grow so quickly — often ready to harvest in as little as three weeks — that they are invaluable companion plants for slow-growing crops like spinach, effectively loosening the soil as they grow and then leaving behind perfectly aerated holes when harvested that allow water and air to penetrate more deeply. They also help to mark the rows of slow-germinating spinach seeds, making it easier to identify and weed the bed before the spinach seedlings fully emerge. The fast-slow pairing means both crops can occupy the same space at different stages of development, making exceptional use of limited garden real estate.
Broccoli and Onions
Onions planted alongside broccoli provide a strong aromatic barrier that confuses and deters the cabbage moths, aphids, and other insects that are drawn to brassica crops throughout the growing season. Their compact, upright growth means they take up minimal space between broccoli plants and compete very little for light or nutrients. Onions also help suppress weeds in the spaces between the larger broccoli plants, keeping the bed tidy with minimal effort from the gardener.
Eggplant and Beans
Beans are excellent companions for eggplant, fixing nitrogen from the air into the soil and providing a continuous supply of this essential nutrient to the heavy-feeding eggplant plants growing beside them. Bush beans in particular are ideal, growing in a compact mound that shades the soil around eggplant roots and keeps it moist during the heat of summer. Eggplant is also believed to repel the Mexican bean beetle from nearby bean plants, making the relationship genuinely beneficial in both directions.
Parsnips and Peas
Parsnips and peas are natural spring companions that share similar preferences for cool temperatures and deep, loose, fertile soil. Peas fix nitrogen into the soil as they grow, providing a slow-release fertilizer for the parsnips developing beside them, while their upright, climbing growth means they shade the soil without competing significantly for space with the parsnips below. As peas finish producing in early summer and are pulled out, the parsnips continue to develop and swell in the newly enriched, open soil left behind.
Swiss Chard and Kohlrabi
Swiss chard and kohlrabi are highly compatible cool-season companions that grow well in similar conditions and complement each other spatially in the garden bed. The broad, upright leaves of Swiss chard provide light dappled shade over the soil between kohlrabi plants, helping to retain moisture and suppress weeds. Both crops are harvested over a long season by taking outer leaves or swollen stems progressively, meaning they coexist productively in the same space for many weeks without interfering with each other’s development.
Peppers and Spinach
Spinach thrives in the partial shade cast by taller pepper plants during the heat of summer, which prevents it from bolting prematurely and extends its productive season significantly beyond what would be possible in full, direct sun. The spinach in turn acts as a living mulch covering the soil around the pepper roots, conserving moisture, moderating soil temperature, and suppressing weeds without requiring the gardener to apply additional mulch. This vertical layering approach makes excellent use of space and allows two productive crops to occupy the same bed simultaneously.
Cauliflower and Celery
Celery is a well-known companion for cauliflower and the broader brassica family, its strong aromatic compounds deterring the cabbage white butterfly and other insects that target brassica crops throughout the growing season. Both crops require rich, moist, fertile soil and relatively cool growing conditions, making them naturally suited to share a garden bed in spring and autumn. Celery’s upright, narrow habit means it fits neatly between cauliflower plants without competing for the light that the broad brassica leaves need to develop properly.
Potatoes and Horseradish
Horseradish planted at the corners of potato beds is a time-honored companion planting practice that farmers and gardeners have relied upon for generations. It is believed to repel Colorado potato beetles, blister beetles, and other potato pests with its intensely pungent aroma, providing a broad protective barrier around the entire potato planting. Horseradish also improves the disease resistance of nearby potatoes according to many experienced growers, and since it is a robust, long-lived perennial that requires almost no attention, it earns its place in the vegetable garden many times over.
Tomatoes and Carrots
Carrots and tomatoes are compatible companions that make good use of vertical and underground growing space simultaneously. Carrots loosen and aerate the soil around tomato roots as they grow downward, improving drainage and allowing water and nutrients to penetrate more deeply into the root zone. Tomato plants in return provide dappled shade over the carrot tops, keeping the soil cooler and moister during the heat of summer, which improves the flavor and texture of the developing carrot roots below.
Cucumbers and Sunflowers
Sunflowers make surprisingly effective companions for cucumbers, their tall, sturdy stems providing a natural trellis for cucumber vines to climb when planted in close proximity. The broad sunflower leaves cast gentle shade that helps keep the soil at the base of cucumber plants cool and moist during the hottest weeks of summer. Sunflowers also attract pollinators in large numbers, which significantly improves cucumber fruit set and overall yield throughout the growing season.
Garlic and Beets
Garlic is a wonderfully useful companion for beets, its powerful sulfurous scent deterring aphids, beetles, and other pests that commonly trouble beet crops. Beets in turn are believed to improve the soil around garlic by adding valuable minerals through their decomposing foliage, creating a richer growing environment for both crops. The two plants occupy different levels of the soil — garlic forming bulbs near the surface while beet roots swell deeper down — meaning competition between them is minimal throughout the growing season.
Beans and Summer Savory
Summer savory is a wonderfully aromatic herb that has been planted alongside beans for centuries, and its reputation as a bean companion is one of the most enduring in the history of kitchen gardening. It is said to deter bean beetles and black aphids, which are among the most troublesome pests for both climbing and bush bean varieties. Many experienced gardeners also believe that summer savory genuinely improves the flavor of beans grown in its company, making it as valuable to the cook as it is to the gardener.
Lettuce and Chives
Chives are excellent companions for lettuce, their sharp onion-like scent confusing and repelling aphids, which are among the most persistent and damaging pests for lettuce crops in both spring and autumn. They take up very little space, growing in neat, upright clumps that fit tidily between lettuce plants without shading or crowding them. Chives also attract beneficial insects including hoverflies when they flower, and their edible leaves and blossoms provide a continuous harvest from the same bed throughout the growing season.
Squash and Borage
Borage is one of the most beloved and useful companion plants in the vegetable garden, and it performs particularly well when grown alongside squash, zucchini, and other cucurbit family members. It is said to repel tomato hornworms and cabbage worms while simultaneously attracting bees in remarkable numbers, dramatically improving pollination rates for squash plants. Borage also accumulates trace minerals in its leaves, and when the leaves decompose into the soil they release those nutrients to feed neighboring plants, making it a genuinely multifunctional garden companion.
Peas and Turnips
Peas and turnips are a highly practical cool-season pairing that share similar growing preferences and work harmoniously together in the spring and autumn garden. Peas fix nitrogen into the soil as they grow, providing a natural fertilizer boost for the turnips developing beside them throughout the season. Turnips in return are believed to repel aphids from pea plants with their pungent aroma, and their compact, leafy tops shade the soil surface effectively, keeping it cool and moist in the conditions that both crops prefer.
Tomatoes and Parsley
Parsley is a useful and undemanding companion for tomatoes, attracting beneficial insects including predatory wasps and hoverflies that feed on aphids, whiteflies, and other common tomato pests. It grows in a compact, tidy mound that fits neatly at the base of tomato plants without competing for light, and it thrives in the rich, moist soil that tomatoes also prefer. Some gardeners report that parsley improves the overall vigor and health of nearby tomato plants, and since both crops are essential to the kitchen, growing them together makes practical sense on every level.
Corn and Dill
Dill is a tall, airy herb that grows harmoniously alongside corn, attracting an extraordinary diversity of beneficial insects including parasitic wasps, lacewings, and hoverflies that keep pest populations in check throughout the summer garden. Its umbrella-shaped flower heads are among the most important insect-attracting structures in the vegetable garden, and planting it among or around corn rows creates a living pest-control system that requires no chemical intervention. Dill and corn also share a preference for full sun and fertile, well-drained soil, making them naturally compatible neighbors.
Cabbage and Sage
Sage is a powerfully aromatic herb that works as an effective companion for cabbage and the broader brassica family, its strong essential oils confusing and deterring the cabbage white butterfly, cabbage moth, and black aphids that plague these crops throughout the growing season. Its low, spreading growth covers the soil between cabbage plants neatly, suppressing weeds and reducing moisture loss from the surface. Sage is also a long-lived, drought-tolerant perennial that establishes itself permanently in the vegetable garden, providing its protective benefits season after season without needing to be replanted.
Peppers and Basil
Basil and peppers are natural companions that thrive in the same hot, sunny conditions and rich, well-drained soil, making them easy to grow side by side throughout the summer growing season. Basil is believed to repel aphids, spider mites, and thrips from pepper plants with its strong aromatic oils, and many gardeners find that pepper plants growing near basil appear healthier and more vigorous than those grown in isolation. The two crops also make one of the most versatile and productive combinations for the kitchen gardener, providing essential ingredients for countless recipes from a single, well-planned garden bed.
Onions and Chamomile
Chamomile planted among onions is believed to improve their growth and enhance their flavor, and this combination has been practiced by experienced kitchen gardeners for many generations. Chamomile attracts hoverflies and parasitic wasps that prey on the aphids and thrips that commonly attack onion crops, providing a natural and effective form of biological pest control. It also releases beneficial compounds from its roots into the surrounding soil that improve the overall growing environment for neighboring plants, making it one of the most broadly useful and generous companion plants available to the vegetable gardener.