Cabbage and Mint
Beneficial Pair — Good Match
It's a plausible story without a citation behind it - the scent-masking claim hasn't been tested for cabbage moth specifically, and mint's well-documented invasive habit is the more concrete, better-established concern here.
Mechanism: Pest Masking (Scent Confusion)
Mint's strong menthol scent is traditionally credited with confusing cabbage moth's ability to locate cabbage by smell, similar to claims made elsewhere on this site. Cabbage itself has a notably shallow, wide-spreading root system to support its heavy head, which puts it in more direct competition with mint's aggressive spreading rhizomes than a deeper-rooted crop would face.
Mint's pest-masking claim near cabbage follows the same familiar pattern seen with tomatoes on this site, but the practical risk of letting it spread unconfined is arguably worse here.
A Shallow-Rooted Crop Meets an Aggressive Spreader
Cabbage develops a wide, shallow root system to support its dense head, occupying much of the same soil depth mint's rhizomes travel through as they spread. Where a deep-rooted crop like tomato has some root mass mint simply can't reach, cabbage doesn't have that same buffer - an unconfined mint patch is competing directly in the layer cabbage relies on most.
This makes containment even more important here than it is elsewhere on this site. A sunken pot or dedicated container isn't just good practice with cabbage - it's close to essential if you don't want mint's spread to become a direct competitor for the exact soil cabbage needs.
Spacing
Never plant mint directly in the ground near cabbage - use a container or sunken pot, same guidance as mint and tomatoes elsewhere on this site, but with less margin for error given cabbage's own shallow roots.
Watch For
Because cabbage and mint's root zones occupy similarly shallow soil, unconfined mint here doesn't just compete for space the way it might with a deeper-rooted crop - it competes directly in the exact layer cabbage depends on most for its own root development.
Frequently Asked Questions
Is mint more dangerous to cabbage than to other crops on this site?
Its invasive habit is the same regardless of neighbor, but cabbage's own shallow, wide root system means there's less depth separation to fall back on compared to a deeper-rooted crop like tomato, making containment more important here.
Does trimming mint's top growth help protect nearby cabbage?
Not much - the underground rhizomes are what actually spread and compete for root space, and trimming visible growth does little to stop that, the same limitation noted for mint near tomatoes.