This photo shows my Mexican marigold plants hardening off in the cold frame. Also known as Tagetes minuta they will likely flower in October when they’ll be standing eye-to-eye with me at 6ft tall. Some folk say they’re not an especially attractive plant, but I don’t care what they look like because, apparently, they’re a natural weed killer.
The roots secrete some compounds called thiophenes which takes on any pathogenic nematodes that dare to share its soil and usually wins. I don’t really understand any of this science stuff, other than I’ve been told it means it’ll kill neighbouring weeds such as bindweed and couch grass. My garden has too much bindweed and is riddled with the evil couch.
I’ll be looking after these young plants with more care than anything else I’m growing this year. Thus far they’re doing just fine, so the only hard part will be deciding which area of weed infested garden to try them in.