Companion Planting: What Works, What Doesn’t
Companion planting pairs plants that help each other. Basil with tomatoes, marigolds with everything. But some pairs compete. Here’s what works.
Some companion planting is science. Some is folklore. Here’s the evidence-based version.
What Works
| Pair | Benefit |
|---|---|
| Basil + Tomato | Flavor, pest deterrent |
| Marigold + Most | Nematode deterrent |
| Chives + Carrots | Pest deterrent |
| Dill + Cabbage | Attracts beneficials |
| Nasturtium + Squash | Trap crop for aphids |
| Lettuce + Radish | Different root depths |
What Doesn’t Work
| Pair | Issue |
|---|---|
| Mint + Anything | Mint takes over |
| Fennel + Most | Inhibits growth |
| Tomato + Potato | Same diseases |
| Onion + Bean | Onion inhibits beans |
Common Questions
Does companion planting really work? Some pairs yes. Others no.
What’s the best companion? Marigolds. Broad benefits.
Can I plant basil with tomatoes? Yes. Classic pairing.
What about mint? Container only. Spreads.
Does marigold repel pests? Nematodes, yes. Others, mixed evidence.
What’s a trap crop? A plant that attracts pests away from your crop.