Posted: 27/06/2014 at 14:07
I don't believe the Tagetes minuta myth.
If it was that easy to get rid of bindweed and ground elder they wouldn't be a problem. It may have some small effect, like yellow rattle reduces grass in a meadow. But it doesn't take it away.
I had a look to see what the RHS say about it -nothing at all.
I think you be planting a not very attractive plant for nothing in the long term.