Select a crop to instantly see which plants grow best alongside it — and which to keep well apart — with the science behind each pairing.
EdenVatika checks companion compatibility across all your crops automatically — no need to cross-reference manually.
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Companion planting is the practice of growing different plants close together for mutual benefit. The right pairings can deter pests, attract beneficial insects, improve soil fertility, and boost yields — all without chemical intervention.
The mechanisms work in several ways. Some plants release compounds through their roots (allelopathy) that suppress weeds or inhibit nearby plants — fennel is the classic example, inhibiting almost everything around it. Others release volatile chemicals through their leaves that confuse or repel pest insects: basil near tomatoes masks the scent that attracts whitefly and aphids.
Nitrogen-fixing legumes (peas, beans) convert atmospheric nitrogen into a form other plants can use — growing them near heavy feeders like corn or squash is essentially free fertilizer. Tall plants like sunflowers provide natural trellises and shade for more delicate crops below.
The evidence for companion planting ranges from well-supported science (French marigold root secretions killing nematodes is thoroughly documented) to traditional wisdom that has worked reliably for thousands of years. Use it as one layer of your growing strategy alongside crop rotation and good soil care.
The most useful companion pairings at a glance. Select any crop above for the full details.
| Crop | Best Companions | Keep Away From |
|---|---|---|
| 🍅 Tomato | Basil, Marigold, Carrot, Chives | Fennel, Potato, Brassicas |
| 🌶️ Pepper | Basil, Carrot, Marigold, Onion | Fennel, Brassicas |
| 🥒 Cucumber | Beans, Dill, Peas, Radish, Marigold | Potato, Sage, Melon |
| 🥬 Zucchini | Beans, Corn, Marigold, Nasturtium | Potato, Fennel, Pumpkin |
| 🥕 Carrot | Onion, Leek, Rosemary, Tomato | Dill, Parsley, Beets |
| 🥗 Lettuce | Carrot, Radish, Chives, Onion | Celery, Parsley, Fennel |
| 🫛 Green Beans | Carrot, Cucumber, Corn, Radish | Garlic, Onion, Fennel |
| 🫛 Peas | Carrot, Mint, Radish, Spinach, Corn | Garlic, Onion, Leek |
| 🧅 Onion | Carrot, Beets, Tomato, Lettuce | Beans, Peas, Asparagus |
| 🧄 Garlic | Tomato, Rose, Carrot, Beets | Beans, Peas, Asparagus |
| 🌿 Basil | Tomato, Pepper, Asparagus | Sage, Fennel |
| 🌼 Marigold | Tomato, Cucumber, Beans, Potato | Fennel |
| 🥔 Potato | Beans, Marigold, Basil | Tomato, Cucumber, Sunflower |
Some plants release volatile compounds that mask the scent of neighbouring crops from pest insects, or simply smell so unpleasant that insects avoid the area. Basil near tomatoes is a well-known example.
Flowers like marigolds, dill and fennel attract predatory wasps, hoverflies and ladybugs that feed on aphids, caterpillars and other soft-bodied pests — turning your garden into a self-policing ecosystem.
Legumes (peas, beans, clover) host bacteria in their roots that convert atmospheric nitrogen into ammonia — a plant-available nutrient. Planting them near heavy feeders like corn, squash and brassicas is essentially organic fertilization.
Some plants actively inhibit their neighbours by releasing chemicals through their roots or leaves. Fennel is the most notorious — it inhibits almost everything. Black walnut is another. Knowing what to keep apart is as important as knowing what to plant together.
Tall crops like sunflowers, corn and Jerusalem artichoke provide natural shade and wind protection for delicate plants below. Sprawling squash and pumpkin suppress weeds as living mulch.
Sacrificial plants attract pests away from your main crop. Nasturtiums draw aphids away from vegetables; mustard attracts flea beetles; Blue Hubbard squash lures squash vine borers away from zucchini.
Yes — for many pairings, the evidence is strong. French marigold root secretions have been shown in multiple studies to significantly reduce nematode populations. Basil near tomatoes demonstrably reduces whitefly. Legume nitrogen fixation is well-established science. Other benefits, like "improving flavour," have less rigorous evidence and are based on gardening tradition. Use well-documented pairings (pest deterrence, nitrogen fixation, trap cropping) as your foundation, and treat flavour benefits as a bonus.
For volatile-compound-based deterrence (basil, marigolds, chives), plant within 12–24 inches of the crop you want to protect. For root-based effects (nematode suppression, nitrogen fixation), the plants need to share soil — within the same bed. For physical effects (shade, structure), simply ensure one plant is on the windward or sun side of the other.
Fennel is strongly allelopathic — it releases chemicals from its roots and foliage that inhibit germination and root growth in most other plants. Tomatoes, peppers, beans, and even basil all grow poorly near fennel. Grow fennel in its own isolated container or in a far corner of the garden where it cannot affect other crops.
The Three Sisters is a Native American intercropping system using corn, beans, and squash together. Corn provides a vertical pole for beans to climb. Beans fix nitrogen that feeds the heavy-feeding corn and squash. Squash spreads along the ground, shading out weeds and retaining soil moisture with its large leaves. The three crops support each other's needs completely, and together they produce far more food per square foot than any of them grown alone.
Companion planting significantly reduces pest pressure but should be part of a broader integrated pest management strategy — not your only line of defence. Combine it with regular monitoring, crop rotation, physical barriers (row covers, copper tape), and good garden hygiene (removing diseased leaves promptly). The goal is to create a balanced ecosystem where pest populations are naturally suppressed, not to eliminate all pests entirely.
Plan your garden from seed to harvest.
EdenVatika checks companion compatibility for every crop in your beds automatically — and flags any antagonistic pairings before you plant, saving you from a season of reduced yields.
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