Can I plant sea kale next to radish?

Yes. Radish (including the daikon form) is a documented trap crop for flea beetles, which prefer its mustard oils over other brassicas and can be sacrificed or pulled once infested: the same research cited on the radish page. A different genus (Crambe) from most brassicas here, but the same family and the same flea-beetle vulnerability.

Companion Planting & Garden Value: Sea Kale

Crambe maritima

Spacing: needs about 9 square feet per plant. Mature height: 1.5-2.5 ft.

Plant these nearby

Radish: Radish (including the daikon form) is a documented trap crop for flea beetles, which prefer its mustard oils over other brassicas and can be sacrificed or pulled once infested: the same research cited on the radish page. A different genus (Crambe) from most brassicas here, but the same family and the same flea-beetle vulnerability. (source)

Keep these apart

Nothing it needs to be kept away from.

Common pairings, answered directly

Can I plant sea kale next to radish?: Yes. Radish (including the daikon form) is a documented trap crop for flea beetles, which prefer its mustard oils over other brassicas and can be sacrificed or pulled once infested: the same research cited on the radish page. A different genus (Crambe) from most brassicas here, but the same family and the same flea-beetle vulnerability.

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

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