This chart is based upon tradition, observation and published material.
A Good Companion Plant may -
Conversely, there are plants that are incompatible.
| CROP | COMPANION PLANTS | INCOMPATIBLE WITH |
| Asparagus | Tomato, Parsley, Basil | |
| Beans | Most Vegetables & Herbs | |
| Beans, Broad | Potato, Cucumber, Maize, Strawberry, Celery, Summer Savory | Onion |
| Beans, Runner | Maize, Summer Savory, Radish | Onion, Beets, Kohlrabi, Sunflower |
| Cabbage Family | Aromatic Herbs, Celery, Beetroot, Onion Family, Chamomile, Spinach, Chard | Dill, Strawberries, Runner Beans, Tomato |
| Carrots | Pea, Lettuce, Rosemary, Onion Family, Sage, Tomato | |
| Celery | Onion & Cabbage Families, Tomato, Broad Beans, Nasturtium | Dill |
| Cucumber | Beans, Maize, Pea, Sunflowers, Radish | Potato, Aromatic Herbs |
| Aubergine (Eggplant) | Broad Beans, Marigold | |
| Lettuce | Carrot, Radish, Strawberry, Cucumber | |
| Maize (Corn) | Potato, Broad Beans, Pea, Pumpkin, Cucumber, Squash | Tomato |
| Melon | Maize, Nasturtium, Radish, | |
| Onion Family | Beetroot, Carrot, Lettuce, Cabbage Family | Beans, Peas |
| Parsley | Tomato, Asparagus | |
| Peas | Carrots, Radish, Turnip, Cucumber, Maize, Beans | Onion Family, Gladiolus, Potato |
| Potato | Beans, Maize, Cabbage Family, Marigolds, Horseradish | Pumpkin, Squash, Tomato, Cucumber, Sunflower |
| Pumpkins | Maize, Marigold | Potato |
| Radish | Pea, Nasturtium, Lettuce, Cucumber | Hyssop |
| Spinach | Strawberry, Cauliflower, Celery | |
| Squash | Nasturtium, Maize, Marigold | Potato |
| Strawberry | Broad Beans, Lettuce, Onion, Spinach | Cabbage |
| Tomato | Basil, Onion Family, Nasturtium, Marigold, Asparagus, Carrot, Parsley, Cucumber, Mint | Potato, Fennel, Cabbage Family |
| Turnip | Pea | Potato |
This following table of herbs which can be used to repel insects and the plants they can be used to protect. The final column gives the plants for which they are bad companions and some other points of note.
| HERB | COMPANION FOR | PESTS REPELLED | INCOMPATIBILITIES |
| Allium (Onion Family) | vegetables, fruit trees | aphids, carrot flies, moles, tree borers, and weevils | peas and beans |
| Angelica (Angelica archangelica) | Dill | ||
| Basil (Ocimum basilicum) | Tomatoes | Flies, Mosquitoes | Rue |
| Bay leaves | beans or grains | weevils and moths | |
| Borage (Borago officinalis) | Tomatoes, Squash, Strawberries | Tomato Worm | |
| Caper Spurge or Mole Plant (Euphorbia lathyris | Moles and Mice | poisonous, irritant milky sap | |
| Caraway (Carum carvi) | Good for loosening the soil. | Avoid Dill | |
| Castor Oil Plant (Ricinus communis). | Moles | seeds extremely poisonous | |
| Catnip (Nepeta cataria) | Aubergine | Flea Beetle, Ants | |
| Chamomile (Chamaemilum nobile) | Cabbage, Onion | ||
| Coriander (Coriandrum sativum) | all vegetables | Aphids | attracts Bees |
| Chervil (Anthriscus cerefolium ) | Radish | ||
| Chives (Allium schoenoprasum) | Carrots | Root Flies | |
| Dill (Anethum graveolens) | Cabbage | Carrots and Caraway | |
| Fennel (Foeniculum vulgare) | Most plants | ||
| Feverfew (Chrysanthemum parthenium syn. Tanacetum parthenium) | Roses | attracts Aphids away | seeds freely |
| Garlic | Roses, Raspberries | Aphids | |
| Henbit (Lamium amplexicaule) | General Insect Repellent | ||
| Hyssop (Hyssopus officinalis ) | Cabbage, Grapes | Cabbage White Butterflies | Dislikes Radishes |
| Lavender (Lavandula angustifolia) | Moths - make sachet with southernwood, wormwood and rosemary, use in doors | ||
| Marigolds (Tagetes sp.) most have aromatic foliage | Good companion to most plants | Nematodes, Aphids and others | |
| Mexican marigold (Tagetes minuta), Muster-John-Henry | Good insect repellant, inhibits ground-elder | ||
| Mint (Mentha sp. ) | Cabbage, Tomatoes | Cabbage White Butterflies, Aphids, Flea Beetles | invasive roots |
| Mustard (Brassica juncea) | cabbage, cauliflower, radish, brussel sprouts, turnips, and kohlrabi | a trap crop to attract many insect pests | |
| Nasturtium (Tropaeolum majus) | Radishes, Cabbage, Squashes and Pumpkims, fruit trees | Aphids, Squash Bugs, Striped Pumpkin Beetle | |
| Oregano(Origanum vulgare) | Brassicas | Cabbage Butterflies | |
| Pennyroyal (Mentha pulegium ) | Roses | Flies, Mosquitoes, Fleas, others | invasive roots |
| Petunia (Petunia hybrida) | Beans | ||
| Pot Marigold (Calendula officinalis) | Tomatoes | Tomato Worm, Asparagus Beetles, Whitefly | |
| Pyrethrums (Chrysanthemum cinaeriofolium) | Dried flower heads make an insecticide. | ||
| Rosemary (Rosmarinus officinalis | Cabbage, Beans, Carrots, Sage | Cabbage Butterflies, Bean Beetle, Carrot Fly | |
| Rue (Ruta gaveolens) | Roses and Raspberries | Japanese Beetles | Dislikes Sweet Basil |
| Sage (Salvia officinalis) | Rosemary, Cabbage, Carrots | Cabbage Moth, Carrot Fly, Flea Beetle, Slugs | Dislikes Cucumbers |
| Southernwood (Artemesia abrotanum) | Cabbages | Cabbage Butterflies | |
| Summer Savory (Satureia hortensis ) | Beans | Bean Beetles | |
| Tansy (Tanacetum vulgare) | Fruit Trees, Roses, Raspberries | Flying Insects, Japanese Beetles, Striped Cucumber Beetles, Squash Bugs, Ants, Flies | |
| Thyme (Thymus vulgaris) | Cabbage | Cabbage Worm | |
| Wormwood (Artemisia absinthium) | Moths, Slugs, Carrot Fly. Plant at boundaries to keep animals out of the garden. | Fresh material will stunt growth of young plants, use dried sprigs | |
| Yarrow (Achillea millefolium ) | Plant near aromatic herbs to enhance production of essential oils. | Attracts Hover Flies and their larvae prey on Aphids |