Companion planting pairs plants that help each other grow — through pest deterrence, pollination, nutrient sharing, or shade provision. But the wrong pairing can stunt growth or attract problems.
Our companion planting tool lets you search any plant and instantly see its best companions and plants to avoid. Each recommendation includes the reason — so you understand the science behind the pairing, not just a list.
Recommendations follow research from University of Minnesota Extension and NC State Extension.
Frequently Asked Questions
What is companion planting?
Companion planting is growing certain plants together for mutual benefit. Benefits include natural pest control (marigolds repel nematodes), improved pollination (borage attracts bees), nutrient sharing (legumes fix nitrogen for neighboring plants), and physical support (corn provides a trellis for beans).
What should not be planted next to tomatoes?
Avoid planting fennel, brassicas (cabbage, broccoli, cauliflower), and mature dill near tomatoes. Fennel releases compounds that inhibit tomato growth. Brassicas compete for the same nutrients. Good tomato companions include basil, marigolds, and carrots.
Do companion planting charts really work?
Many companion planting recommendations are backed by research. For example, studies confirm that marigolds reduce root-knot nematodes, basil repels certain flies near tomatoes, and legumes genuinely fix nitrogen. Some traditional claims lack evidence, which is why our tool notes the mechanism behind each pairing.