Take it for what it's worth - I'm not a student of companion planting, however there is something interesting taking place in my garden this year.
There are 6 pots of zinnias. Having seeds to spare, I tossed some in the few square inches of space between the oregano plants in another pot. Despite a regular regime of spraying and care, the 6 pots of zinnias are afflicted to varying degrees with some kind of persistent fungus/insect, or maybe a combo of both, that I am struggling to keep under control. Aside from a few pinholes, the zinnias in the oregano pot are healthy and blemish-free, despite the crowding due to the bushy growth habit of the herb.
I aim to plant some oregano in the other zinnia pots, now, to observe whether it can alleviate a problem already in progress. (Will update this post if anything changes
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