Can I plant kale next to onion?

Yes. Onion scent is reputed to confuse cabbage moths that target kale. The research behind this is real but garlic-specific (field trials intercropping garlic with cabbage reduced diamondback moth damage) — onion hasn't been tested the same way, so treat the onion version as a reasonable extrapolation, not a directly measured result.

Can I plant kale next to tomato?

Better not to. Kale can stunt nearby tomato growth.

Companion Planting: Kale

Brassica oleracea

Spacing: 1 per square foot. Mature height: 1-2 ft.

Plant these nearby

Onion: Onion scent is reputed to confuse cabbage moths that target kale. The research behind this is real but garlic-specific (field trials intercropping garlic with cabbage reduced diamondback moth damage) — onion hasn't been tested the same way, so treat the onion version as a reasonable extrapolation, not a directly measured result.

Keep these apart

Tomato: Kale can stunt nearby tomato growth.

Common pairings, answered directly

Can I plant kale next to onion?: Yes. Onion scent is reputed to confuse cabbage moths that target kale. The research behind this is real but garlic-specific (field trials intercropping garlic with cabbage reduced diamondback moth damage) — onion hasn't been tested the same way, so treat the onion version as a reasonable extrapolation, not a directly measured result.
Can I plant kale next to tomato?: Better not to. Kale can stunt nearby tomato growth.

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

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