This isn't a one-off rogue, there is a ring of them - sown deliberately - in amongst cherry trees in the middle of the camp field, where there is a sitting area with picnic benches for the campers to use. As we don't graze that field any more, it's more being aware if we get another, which is a rogue, appear elsewhere, and where livestock might get at it.
The chap who sowed them assumed that either they were from wild flower mixes we've used elsewhere on the farm (having checked they didn't include anything toxic to livestock before we bought them), or that they'd be okay because they must be microgreens' seeds, and all those plants are, by definition, edible... No comprehension that something which is edible for humans, in small quantities at the cotyledon stage, could be toxic to livestock when grown on to an adult plant....
It can be very stressful at times, living amongst non-farming folk... (Although actually the chap in question grew up on a farm in Australia...) The benefits of community living do hugely, for ageing single me, outweigh the frustrations, but there are certainly plenty of frustrations...