Companion Planting Chart
The Companion Planting Chart is a gardening reference tool covering companion planting chart, companion planting guide, what to plant together chart, vegetable companion planting chart. Use the chart below to look up values instantly. Printable and downloadable versions are available on this page.
Companion Planting Chart — Vegetables
| Plant | Good Companions | Bad Companions | Why — Benefit or Problem |
|---|---|---|---|
| Tomatoes | Basil, carrots, marigolds, parsley, asparagus | Fennel, cabbage family, brassicas | Basil repels aphids and spider mites. Marigolds deter nematodes and whitefly. Fennel inhibits tomato growth. |
| Basil | Tomatoes, peppers, oregano | Sage | Repels aphids, whitefly, and mosquitoes near tomatoes and peppers. Sage inhibits basil's growth. |
| Carrots | Tomatoes, lettuce, onions, chives, rosemary | Dill (when mature), parsnips | Tomatoes and chives improve carrot flavour. Mature dill stunts carrot growth. |
| Beans (pole and bush) | Carrots, cucumbers, corn, squash, brassicas | Onions, garlic, shallots, fennel | Beans fix nitrogen in the soil — benefiting neighbouring plants. Alliums inhibit bean growth. |
| Corn | Beans, squash, peas, cucumbers | Tomatoes | Beans fix nitrogen for corn. Squash shades soil reducing weeds. Together these are the Three Sisters companion planting system. |
| Squash | Corn, beans, nasturtiums, marigolds | Potatoes | Nasturtiums attract aphids away from squash. Marigolds deter squash bugs. |
| Lettuce | Carrots, radishes, strawberries, chives | Broccoli (can be too competitive for space) | Radishes loosen soil for lettuce roots. Chives deter aphids. |
| Onions | Carrots, beets, strawberries, chamomile | Beans, peas, sage, asparagus | Onions deter carrot fly. Beans and peas are inhibited by alliums. |
| Peppers | Basil, carrots, tomatoes | Fennel, kohlrabi | Basil repels aphids and improves pepper flavour. |
| Cucumbers | Beans, corn, peas, radishes, lettuce | Fennel, sage, strong aromatic herbs | Radishes deter cucumber beetles. Beans improve soil nitrogen for cucumbers. |
| Cabbage family (brassicas) | Celery, onions, hyssop, chamomile, marigolds | Strawberries, tomatoes, peppers | Hyssop and chamomile attract beneficial insects. Marigolds deter cabbage moths. |
| Potatoes | Beans, cabbage, corn, horseradish, marigolds | Tomatoes, squash, sunflowers, cucumbers | Horseradish deters Colorado potato beetles. Tomatoes share blight diseases with potatoes. |
| Spinach | Strawberries, peas, beans, celery | Fennel | Peas and beans shade spinach from heat. Peas fix nitrogen. |
| Peas | Carrots, radishes, turnips, cucumbers, beans | Onions, garlic, chives, gladioli | Peas fix nitrogen. Alliums stunt pea growth. |
| Radishes | Lettuce, peas, cucumbers, carrots | Hyssop | Radishes loosen soil and deter cucumber beetles. |
| Beets | Onions, lettuce, cabbage, garlic | Pole beans (runner beans) | Garlic deters aphids near beets. Pole beans and beets inhibit each other. |
| Garlic | Roses, beets, tomatoes, chamomile | Peas, beans, sage, parsley | Garlic deters aphids, Japanese beetles, and fungal diseases on roses and tomatoes. |
| Marigolds | Almost all vegetables — universal companion | None commonly noted | Deters aphids, whitefly, nematodes, and many soil pests. Attracts pollinators. |
| Nasturtiums | Squash, cucumbers, tomatoes, brassicas | None commonly noted | Acts as a trap crop — aphids prefer nasturtiums over vegetables. Also attracts pollinators. |
| Strawberries | Lettuce, spinach, beans, onions, thyme | Cabbage, broccoli, cauliflower | Thyme deters worms. Cabbage family competes aggressively for nutrients. |
Source: Traditional companion planting practices and research from Rodale Institute and Cornell University Extension
The Three Sisters Companion Planting System
The Three Sisters is a centuries-old Indigenous North American companion planting system using corn, beans, and squash together — each plant provides mutual benefits that improve yield for all three.
- Corn grows tall first providing a vertical structure for bean vines to climb — eliminating the need for trellises or poles.
- Beans are nitrogen-fixing legumes — their root bacteria convert atmospheric nitrogen into a form that enriches the soil for the corn and squash which are heavy nitrogen feeders.
- Squash spreads along the ground and its large leaves shade the soil — conserving moisture, cooling the root zone, and suppressing weeds that would compete with all three plants.
- Together the Three Sisters provide a complete nutritional profile: corn for carbohydrates, beans for protein and amino acids, and squash for vitamins and minerals. Indigenous communities relied on this combination as a dietary staple.
Companion Planting — Flowers and Herbs
| Plant | Benefit | Plant Near |
|---|---|---|
| Marigold (Tagetes) | Deters aphids, nematodes, whitefly, and many soil pests. Attracts pollinators. | Most vegetables — especially tomatoes, peppers, squash. |
| Nasturtium | Trap crop that draws aphids and caterpillars away from vegetables. Attracts pollinators. | Squash, cucumbers, brassicas, tomatoes. |
| Borage | Deters tomato hornworm and cabbage worm. Attracts bees strongly. | Tomatoes, squash, strawberries. |
| Lavender | Repels fleas, moths, and whitefly. Attracts bees and butterflies. | Brassicas, roses, herbs. |
| Dill (young plants) | Attracts beneficial insects (lacewings, hoverflies, parasitic wasps) that prey on aphids. | Brassicas, lettuce, onions. Keep away from carrots and tomatoes when mature. |
| Chamomile | Improves growth and flavour of nearby plants. Attracts beneficial insects. | Brassicas, onions, most vegetables. |
| Sunflowers | Attracts pollinators and predatory insects. Provides shade and windbreak for shorter plants. | Cucumbers, corn, squash. |
| Yarrow | Attracts predatory insects that control aphids and caterpillars. Improves nearby plant health. | Most garden plants. |
Companion Planting Lookup
Enter a vegetable or herb to get its best companions, plants to avoid, and spacing guide. Filter by garden type or season.
26 results found
Basil, carrots, marigolds, parsley, asparagus
Fennel, cabbage family, brassicas
60–90 cm apart
Tomatoes, peppers, oregano
Sage
20–30 cm apart
Tomatoes, lettuce, onions, chives, rosemary
Dill (when mature), parsnips
5–8 cm apart
Carrots, cucumbers, corn, squash, brassicas
Onions, garlic, shallots, fennel
15–20 cm apart
Beans, squash, peas, cucumbers
Tomatoes
30–35 cm apart
Corn, beans, nasturtiums, marigolds
Potatoes
60–90 cm apart
Carrots, radishes, strawberries, chives
Broccoli (can be too competitive for space)
20–25 cm apart
Carrots, beets, strawberries, chamomile
Beans, peas, sage, asparagus
10–15 cm apart
Basil, carrots, tomatoes
Fennel, kohlrabi
45–60 cm apart
Beans, corn, peas, radishes, lettuce
Fennel, sage, strong aromatic herbs
45–60 cm apart
Celery, onions, hyssop, chamomile, marigolds
Strawberries, tomatoes, peppers
45–60 cm apart
Beans, cabbage, corn, horseradish, marigolds
Tomatoes, squash, sunflowers, cucumbers
30–38 cm apart
Strawberries, peas, beans, celery
Fennel
15–20 cm apart
Carrots, radishes, turnips, cucumbers, beans
Onions, garlic, chives, gladioli
5–8 cm apart
Lettuce, peas, cucumbers, carrots
Hyssop
5–8 cm apart
Onions, lettuce, cabbage, garlic
Pole beans (runner beans)
10–15 cm apart
Roses, beets, tomatoes, chamomile
Peas, beans, sage, parsley
15–20 cm apart
Almost all vegetables — universal companion
None commonly noted
20–30 cm apart
Squash, cucumbers, tomatoes, brassicas
None commonly noted
25–30 cm apart
Lettuce, spinach, beans, onions, thyme
Cabbage, broccoli, cauliflower
30–45 cm apart
Tomatoes, squash, strawberries
None commonly noted
30–45 cm apart
Brassicas, roses, herbs
None commonly noted
45–60 cm apart
Brassicas, lettuce, onions (young plants only)
Carrots, tomatoes (when mature)
20–30 cm apart
Brassicas, onions, most vegetables
None commonly noted
20–30 cm apart
Cucumbers, corn, squash
Potatoes
45–60 cm apart
Most garden plants
None commonly noted
30–45 cm apart