We don't get these on the allotment but the odd one pops up in the garden. I hoik them out as soon as I see them because they'll take over if you let them. I've seen them growing up through tarmac and through concrete. I don't mean through the cracks, I mean straight up through the middle of the tarmac or concrete. Apparently they grow on motorways. I wouldn't put it past them.
They're weird-looking things, and it's no surprise that very similar plants have been found in fossils from the Carboniferous period, before flowering plants or grasses evolved. They don't have leaves as such, but spiny segments. They don't have flowers or seeds but reproduce by spores. They're coated with silica, and I've heard that in the past they were used for scouring pots. Don't bother spraying them with weedkiller. It doesn't even penetrate this coating.
I have mixed feeling about horsetails. They're a nuisance, but they have this strange prehistoric beauty to them. There are some gorgeous photomicrographs of horsetails at the Microscopy UK website which illustrate what I mean. Sometimes on gardening shows the presenter will enthuse about "architectural plants". Horsetails could fit that description. They almost look as if they're built rather than something that grows. They remind me of the early computer-generated landscapes in the 1980s, when we were all enthralled by fractals and chaos theory.
Horsetails - weird prehistoric alien silicon-based computer-generated weeds growing in my garden. I think the "cool" factor beats the "nuisance" factor. What do you think?