As I've ventured into the world of gardening, it has been my personal goal to create the best possible garden layout for the most success. Call me a little crazy, but based on the literature and research, companion planting seems to be one of the most effective ways to deter pests, attract pollinators, build diversity, and have long-term sustainability in the garden. Here is what I've found and a complete guide (by crop) of companion plant friends, enemies, and additional notes.
A Note about the Guide
- These are notes I have compiled from multiple sources.
- It is by no means exhaustive, but is hopefully helpful in identifying 1) plant friends 2) plant enemies (what plants shouldn't be put near each other for various reasons and 3) special notes about why those plants don't go well together in addition to other flowers or herbs that may benefit that particular crop.
- You might see conflicting information depending on the source. When compiling, I tried my VERY best to weed out the one-off companion plant recommendations and instead write only the commonly accepted companion plants. I even bolded the plant friends that were listed in multiple sources (more than 3) for ease and trustworthiness.
General Rules to Companion Planting
Separate members of similar crop families if possible.
Cultivate a polyculture garden where different varieties of the same crop are spread out throughout the garden, and many different crops are growing next to each other rather than each crop in its own area. A monoculture makes it easier for pests to feast on their desired crop.
Diversify by adding herbs, flowers, vegetables and fruit to each area of your garden. This will encourage beneficial insects and pollinators throughout the garden.
Beneficial insect and pollinator-friendly plants: Alfalfa, alyssum, angelica, basil, borage, buckwheat, butterfly weed, caraway, chervil, clover, coreopsis, coriander (cilantro), cosmos, dandelion, dill, fennel, lavender, lemon balm, lobelia, lovage, mallow, marigold, mint, parsley, prairie sunflower, Queen Anne’s lace, rudbeckia, scabiosa, statice, sunflowers, tansy, thyme, tithonia, zinnia.
Companion Planting Guide
Also Available in Downloadable PDF Here!
Type of Vegetable | Friends (Bolded words are cited in more than one source as a good companion plant) | Enemies | Special Notes |
Asparagus | Basil, carrots, calendula, coriander, dill, marigolds, nasturtium, parsley, petunia, tomatoes | Garlic, onions, potatoes | ​Marigolds, parsley and tomatoes protect against asparagus beetles. |
Beans, Bush | ​Beets, cabbage, carrot, cauliflower, celeriac, celery, chard, corn, cucumber, eggplant, leek, marigold, parsnip, pea, potatoes, radish, rosemary, strawberry, sunflower | ​Basil, fennel, kohlrabi. Garlic, onion and shallot stunt the growth of beans. Beans and peas have similar pests. | ​Marigold deters Mexican bean beetles. Nasturtium and rosemary deter bean beetles. Summer savory deters bean beetles, improves growth and flavor. |
Beans, Pole | ​Carrot, cauliflower, chard, corn, cucumber, eggplant, marigold, pea, potatoes, rosemary, strawberry | ​Basil, beet, cabbage, fennel, kohlrabi, onion family (stunts growth of beans), radish, sunflower. Beans and peas have similar pests. | ​Marigold deters Mexican bean beetles. Nasturtium and rosemary deter bean beetles. Summer savory deters bean beetles, improves growth and flavor. |
Beets | ​Broccoli, brussels sprouts, bush beans, cabbage, cauliflower, chard, garlic, kohlrabi, onions, lettuce | ​Charlock, field mustard. Pole beans and beets stunt each other's growth. | ​Pole beans and beets will compete for growth. Composted beet leaves add magnesium to soil when mixed. Garlic improves growth and flavor. |
Carrots | ​Beans, brussels sprouts, cabbage, chive, lettuce, leek, onions, peas, peppers, radish,rosemary, sage,tomatoes | Dill retards growth. Celery, parsnip. Spinach, lettuce, and carrots have similar pests. | ​Chives improve flavor, rosemary deters carrot flies. |
Celery | ​Bush bean, brassica family (especially cauliflower), leek, parsley, pea, and tomato, chives, nasturtium | ​Carrot, parsnip | ​Chives and garlic deter aphids. Nasturtium deters bugs and aphids. |
Chard | ​Bean, brassica family and onion | ​ | ​ |
Corn | ​Beet, climbing beans, bush beans, cabbage, cucumber, marjoram, melons (cantaloupe), morning glory, peas, parsley, pumpkins, squash, sunflowers, zucchini | ​Tomatoes (have similar pests, tomato worms and corn earworms) | ​Beans and peas supply nitrogen. Odorless marigold and white geranium deter Japanese beetles. Pigweed raises nutrients from the subsoil to where the corn can reach them. |
Cucumber | ​Bean, beets, brassica family, corn, pea, radish, tomato | ​Sage is generally injurious to cucumber. Squash, watermelon and cucumbers have similar pests. | ​Marigold deters beetles. Nasturtium deters aphids, beetles and bugs, improves growth and flavor. Oregano deters pests in general. Tansy deters ants, beetles, bugs, flying insects. |
Eggplant | ​Bush bean, catnip, pea, pepper, marigold, pepper, potatoes | none | Marigold deters nematodes. |
Garlic | ​Beets, carrots, brassicas, chamomile, dill, eggplant, fruit trees, nasturtiums, marigolds, Peppers, potatoes, roses, rue, tomatoes | ​Asparagus, beans, sage, parsley, strawberries, other alliums | ​ |
Kale | ​Beet, bush bean, cabbage, celery, cucumber, dill, garlic, lettuce, nasturtium, onion, peas, pepper, potatoes, spinach, tomato | Pole bean | ​ |
Leek | Beet, bush bean, carrot, celeriac, celery, onion, parsley, tomato | Bean, pea | ​ |
Lettuce | ​Everything, especially beet, brassica family, carrot, corn, onion, pumpkin, radish, strawberry, chives, garlic | none | ​Chives and garlic deter aphids. |
Parsnip | ​Bush bean, garlic, onion, pea, pepper, potatoes, radish | ​Caraway, carrot, celery | ​ |
Peas | ​Bean, carrot, celery, chicory, chives, mint, corn, cucumber, eggplant, parsley, peppers, radish, spinach, strawberry, sweet pepper, turnip | ​Garlic and onion stunt the growth of peas. | ​Chives deter aphids. Mint improves health and flavor. |
Peppers | ​Basil, carrot, eggplant, onion, okra, parsnip, pea, tomato | Fennel, kohlrabi | ​ |
Potatoes | ​Basil, bush beans, celery, corn, brassica family, eggplant (as trap crop), garlic, horseradish, lettuce, marigolds, onions, parsnip, peas, radishes, spinach | ​Asparagus, brussels sprouts, carrots, cucumbers, kohlrabi, melons, peppers, raspberries, squash family, sunflowers, strawberry, tomatoes (tomatoes and potatoes are attacked by the same blight). Corn, tomatoes, and potatoes have similar pests. | ​Cucumbers, tomatoes and raspberries attract harmful pests to potatoes. Horseradish, planted at the corners of the potato patch, provides general protection and disease resistance. Marigold deters beetles. Catmint deters potato beetles. |
Pumpkin | ​Beans, corn, eggplant, melons, marigolds, nasturtiums, oregano, radish, squash | Potatoes | Marigold deters beetles. Nasturtium deters bugs, beetles. Oregano provides general pest protection. |
Radishes | ​Beans, beets, cabbage, carrots, chervil, chives, corn, cucumbers, kale, lettuce, melon, nasturtium, parsnip, pea, spinach, squash, sweet, potatoes, tomato | Hyssop | ​Radish plants will work as a trap crop to protect against certain beetles. Chervil and nasturtium improve growth and flavor. |
Spinach | Brassica family, celery, cilantro, eggplant, legumes, lettuce, onion, oregano, pea, rosemary, radish, strawberry | ​Potatoes. Spinach, lettuce, and carrots have similar pests. | ​ |
Strawberries | ​Bush beans, borage, caraway, chives, lettuce, onions, peas, sage, spinach, squash, thyme | ​Brassica family, eggplants, peppers, potatoes, tomatoes | ​Borage strengthens resistance to insects and disease. Thyme, as a border, deters worms. |
Tomatoes | ​Asparagus, basil, bee balm, bush bean, cabbage, family, carrots, celery, chive, cucumber, garlic, head lettuce, marigold, mint, nasturtium, onions, parsley, peppers, pot marigold (calendula), squash | ​Corn, dill, kohlrabi, pole bean, potatoes. Corn and tomato are attacked by the same worm. Dill, until mature, improves growth and health, but mature dill retards tomato growth. Kohlrabi stunts tomato growth. Potatoes and tomatoes are attacked by the same blight. | ​Basil, mint, and bee balm improve growth and flavor. Basil repels flies and mosquitoes, improves growth and flavor. Bee balm, chives and mint improve health and flavor. Borage deters tomato worm, improves growth and flavor. Marigold deters nematodes. Pot marigold (calendula) deters tomato worm and general garden pests. |
Turnips | ​Onion family, pea | Potatoes | ​ |
Companion Planting by Family
By Family | (Bolded words are cited in more than one source as a good companion plant) | Enemies | Special Notes |
Brassica Family | ​General: Beet, celery, chard, cucumber, lettuce, onion, potatoes, spinach  Broccoli: Basil, beets, bush beans, carrots, celery, chamomile, cucumber, dill, garlic, lettuce, marigolds, mint, nasturtiums, onions, radishes, rosemary, sage, spinach, swiss chard, thyme, oregano  Brussels Sprouts: Basil, bush beans, beet, carrot, celery, cucumber, lettuce, garlic, mint, nasturtium, onion, peas, potatoes, radish, spinach, tomato, thyme  Cabbage: Beets, bush bean, celery, carrot, chard, dill, lettuce, mint, nasturtium, spinach, onions, potatoes, rosemary, sage, spinach, thyme, tomato  Cauliflower: Beet, bush bean, carrot, broccoli, brussels sprouts, celery, cucumber, dill, kale, lettuce, mint, nasturtium, onion family, potatoes, rosemary, sage, spinach  Kale: Beet, bush bean, cabbage, celery, cucumber, dill, garlic, lettuce, nasturtium, onion, peas, pepper, potatoes, spinach, tomato | ​Kohlrabi and tomato stunt each other's growth. Cabbage, broccoli, cauliflower, and kale have similar pests.  Broccoli: Asparagus, cantaloupe, Lima pole and snap beans, mustard, peppers, pumpkins, strawberry, sweet corn, watermelon  Brussels Sprouts: Kohlrabi, pole bean, strawberry  Cabbage: Kohlrabi, pole bean, strawberry, tomatoes  Cauliflower: Pole bean, strawberry  Kale: Pole bean | ​Chamomile and garlic improve growth and flavor. Dill improves growth and health. Catnip, hyssop, rosemary and sage deter cabbage moth. Mint deters cabbage moth and ants, improves health and flavor. Nasturtium deters bugs, beetles, aphids. Marigold deters onion root maggot fly and cabbage root fly. Rosemary repels the cabbage fly that is detrimental to broccoli.  Cabbage: Thyme, Dill, sage, and chamomile deter cabbageworm. Tansy deters cabbageworm and cutworm. Southernwood deters cabbage moth, improves growth and flavor. |
Melons (Cantaloupe, Watermelons etc) | ​General: Corn, pumpkin, radish, squash  Watermelon: Broccoli, corn, garlic, radishes | ​Squash, watermelon and cucumbers have similar pests.  Cantaloupe: Potatoes | ​Marigold deters beetles. Nasturtium deters bugs and beetles. Oregano provides general pest protection. |
Onion Family | ​Beets, brassica family, carrots, kohlrabi, chard, leek, lettuce, parsnip, peppers, spinach, tomatoes, strawberry | ​Asparagus, bean, pea, sage | ​Chamomile and summer savory improve growth and flavor. Pigweed raises nutrients from subsoil and makes them available to the onions. Sow thistle improves growth and health. Marigold deters onion root maggot fly. |
Squash, winter (such as butternut and pumpkins) | ​Beans (pole), buckwheat, corn, calendula, celeriac, celery, corn, dill, marigolds, melon, nasturtiums, onion, oregano, peas, radishes, strawberry, pumpkin, sunflowers | Potatoes | ​Borage deters worms, improves growth and flavor. Marigold and Nasturtium deter squash bugs and beetles. Oregano provides general pest protection. |
Squash, summer (such as zucchini) | ​Beans, corn, dill, garlic, marigolds, nasturtiums, oregano, peas, radishes, spinach | Potatoes and pumpkin | ​Squash, watermelon and cucumbers have similar pests. |
Companion Plants by Herb
Type of Herb | Friends (Bolded words are cited in more than one source as a good companion plant) | Enemies | Special Notes |
Basil | ​Asparagus, beets, bell peppers, cabbage, chili peppers, eggplant, marigolds, oregano, purslane, potatoes, tomatoes | ​Rue, thyme (prefers drier soil) | ​When basil is grown about 1 foot from tomato plants, it will increase the tomatoes yield. It also improves the flavor of lettuce. |
Dill | ​Broccoli, brussels sprouts, Cabbage, Corn, Cucumber, Lettuce, Onion | Tomato | ​ |
Oregano | ​Asparagus, cucumber, grapes, lavender, melon, peppers, rosemary, squash, strawberry, thyme, tomato | ​Mint, chives, basil | ​ |
Parsley | ​Asparagus, apple trees, beans, chives, brassicas, corn, pear trees, peppers, roses, tomato | Dill | ​Alliums will stunt the growth of parsley. |
Rosemary | ​Beans, broccoli, brussels sprouts, cabbage, carrot, cauliflower, chive, kale, lavender, marigold, marjoram, oregano, sage, strawberry, thyme | ​Mint, basil, pumpkin, tomato, cucumber | Rosemary deters cabbage moth. |
Hope this is helpful for you! If you have any questions, personal experience with these companion plants, or requests for other plants to add to this list, let me know in the comments!
References
Smith, Edward C. 2009. The Vegetable Gardener’s Bible. Storey Publishing. 2nd ed.
https://gilmour.com/companion-planting-chart-guide
https://www.burpee.com/blog/companion-planting-guide_article10888.html
https://www.thespruce.com/companion-planting-with-chart-5025124
https://growinginthegarden.com/5-tips-for-successful-companion-planting/
https://www.gardeningchores.com/garlic-companion-plants/
https://sfuaa.org/rosemary-companion-plants/
https://wildyards.com/oregano-companion-plants/
https://www.homefortheharvest.com/companion-plants-for-parsley/#What_can_you_not_plant_near_parsley