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Plant Compatibility Checker

The ultimate companion planting guide. A massive database of 120+ garden crops, herbs, and flowers to identify beneficial relationships and avoid allelopathic conflicts.

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    Select a plant to view relationships.

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    About

    Optimizing a garden requires understanding the complex biological network between plants. This tool leverages a massive dataset of crop interactions to help you design a polyculture system that naturally resists pests and improves soil health. By checking compatibility, you avoid allelopathy (chemical inhibition) and resource competition while maximizing synergy.

    This expanded version covers not just common vegetables, but also fruit trees, cover crops, medicinal herbs, and specific flowers used in Integrated Pest Management (IPM).

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    Formulas

    Plant spacing in polycultures often utilizes the Triangular Spacing Formula to maximize density:

    Area ≈ 0.866 × d2 × N

    Where d is the distance between plants and N is the number of plants. Interaction effects are often categorized by the Interaction Coefficient (I), where I > 0 implies facilitation and I < 0 implies competition.

    Reference Data

    CropBeneficial Partners (Synergy)Antagonistic Partners (Conflict)Mechanism / Note
    TomatoBasil, Carrot, Borage, MarigoldPotato, Corn, Fennel, BrassicasBasil improves flavor; Marigolds deter nematodes.
    StrawberryBorage, Bush Bean, Spinach, CarawayCabbage, Broccoli, CauliflowerBorage adds trace minerals; Brassicas harbor verticillium wilt.
    CucumberSunflower, Corn, Beans, RadishPotato, Sage, Aromatic HerbsRadishes deter cucumber beetles; Potato competes for moisture.
    Apple TreeChives, Foxglove, Wallflower, NasturtiumPotato, Grass, WalnutChives prevent apple scab; Potatoes spread phytophthora.
    AsparagusBasil, Parsley, Tomato, CorianderGarlic, Onion, PotatoTomatoes repel asparagus beetles; Parsley improves vigor.
    ChivesApple, Carrot, Grape, Rose, TomatoBeans, PeasRepels aphids and Japanese beetles; inhibits legumes.
    Fennel(None specifically recommended)Beans, Tomato, Kohlrabi, CorianderAllelopathic: Secretes chemicals inhibiting most neighbors.
    GrapeHyssop, Basil, Geranium, OreganoCabbage, RadishHyssop stimulates growth; Cabbage scent is detrimental.
    BlueberryOak (mulch), Pine, AzaleaTomato, Potato, CabbageRequires acidic soil (pH 4.5-5.5); incompatibile with lime-lovers.
    BorageSquash, Strawberry, Tomato(None typically)Accumulates Ca, K. Attracts bees.

    Frequently Asked Questions

    An ancient method involving Corn, Pole Beans, and Squash. Corn provides the pole, Beans fix Nitrogen, and Squash leaves suppress weeds.
    Fennel is allelopathic. It excretes substances from its roots that actively inhibit the growth of many other plants to reduce competition for itself. It is best grown in a separate container or a secluded patch.
    Generally, yes. Herbs like Mint, Oregano, and Rosemary are excellent "confusers" that mask the scent of vegetables from pests. However, Mint is invasive and should be contained, and some herbs (like Sage) dislike Cucumbers.
    A plant grown specifically to attract pests away from your main crop. For example, planting Nasturtiums near Brassicas attracts aphids to the Nasturtiums, sparing the Cabbage or Kale.
    Alliums (Onions, Garlic, Leeks) produce antibacterial compounds (including sulfur) that kill the beneficial nitrogen-fixing bacteria (Rhizobia) on the roots of legumes (Beans, Peas), stunting their growth.