Cabbage and Chamomile
Beneficial Pair — Good Match
The parasitoid-wasp mechanism has some grounding in research on flowering plants and brassica pests generally; the "physician plant" folklore is a different, older claim with no mechanism proposed and nothing to test.
Mechanism: Pollinator / Beneficial-Insect Attraction
Chamomile's small, accessible daisy flowers draw parasitic wasps that prey on cabbage worms, the same mechanism documented for dill elsewhere on this site. Separately, older folk tradition sometimes calls chamomile a "physician plant," claiming its mere presence generally improves the health and vigor of ailing neighbors - a much broader, vaguer claim with no proposed mechanism behind it at all.
Chamomile carries two distinct reputations near cabbage worth separating clearly, since only one of them has any proposed mechanism behind it at all.
A Real Mechanism and a Much Vaguer Legend
The parasitic-wasp attraction documented for dill elsewhere on this site extends reasonably to chamomile's similarly accessible flowers. Separate from that is chamomile's older folk reputation as a "physician plant" said to generally improve neighboring plants' vigor and disease resistance just by being nearby - an appealing idea, but one with no proposed biological mechanism and nothing that could really be tested as stated.
It's worth being direct about the gap between these two claims: one describes a specific insect responding to a specific flower structure, something researchers can and do measure. The other describes a general, undefined improvement in plant health with no stated pathway - the kind of claim that sounds plausible precisely because it's too vague to check.
Spacing
Space chamomile 10-12 inches from cabbage, letting it flower rather than harvesting every bloom for tea if you want the beneficial-insect draw.
Watch For
Treat the "physician plant" reputation as garden folklore separate from the documented pollinator mechanism - it's an old, appealing idea, but it doesn't describe any known biological process.
Frequently Asked Questions
Is the 'physician plant' idea about chamomile based on any real chemistry?
Not that we're aware of - it's an old, vague folk reputation with no proposed mechanism, distinct from chamomile's better-grounded role attracting parasitic wasps through its flowers.
Which chamomile type is better for the parasitic-wasp benefit, German or Roman?
German chamomile is the upright annual most commonly discussed for this purpose, with abundant small flowers well suited to attracting the small wasps involved - Roman chamomile is a low, spreading perennial more often used as groundcover than as a flowering companion for this specific role.