Companion Planting: Tomato

Solanum lycopersicum

Spacing: 1 per square foot. Mature height: 3-6 ft.

Plant these nearby

• Basil: Widely reputed to improve tomato flavor and repel pests, but a multi-year, garden-scale controlled trial found no consistent taste preference in blind tests, and no evidence basil reduced pest pressure — treat this as one of companion planting's least-supported popular claims. (source)
• Marigold: UF/IFAS Extension confirms French marigold is effective against a wide range of root-knot nematode species — a real, documented effect, not folklore. The insect-pest-deterrent half of this claim is less well documented. (source)
• Carrot: Loosens soil for tomato roots without competing for space above ground.

Keep these apart

• Sweet Corn: Both attract the tomato/corn earworm, and corn shades tomatoes heavily.
• Cabbage: Widely repeated that brassicas stunt tomato growth in shared beds, but no extension or research source was found testing this specific claim — treat it as garden tradition, not measured evidence.

Common pairings, answered directly

Can I plant tomato next to basil?

Yes. Widely reputed to improve tomato flavor and repel pests, but a multi-year, garden-scale controlled trial found no consistent taste preference in blind tests, and no evidence basil reduced pest pressure — treat this as one of companion planting's least-supported popular claims.

Can I plant tomato next to marigold?

Yes. UF/IFAS Extension confirms French marigold is effective against a wide range of root-knot nematode species — a real, documented effect, not folklore. The insect-pest-deterrent half of this claim is less well documented.

Can I plant tomato next to carrot?

Yes. Loosens soil for tomato roots without competing for space above ground.

Can I plant tomato next to sweet corn?

Better not to. Both attract the tomato/corn earworm, and corn shades tomatoes heavily.

Can I plant tomato next to cabbage?

Better not to. Widely repeated that brassicas stunt tomato growth in shared beds, but no extension or research source was found testing this specific claim — treat it as garden tradition, not measured evidence.

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Companion planting for Tomato: which plants to grow next to it, which to keep apart, and the reason behind each pairing.

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