I've never seen it before, and they are only growing in the lawn not flower beds.
It is like roots of a tree growing up. I've tried digging them out, but they go straight down about a foot and then shoot off sidewards and carrys on to god knows how far.
I notice the ground comes up in a large hill then after a while little shoots like spikes come up and they lead to these brown root like things.
I shall take some photos in a week or so as i have smashed them all down due to the dog hurting her paws on the spikes.
Just wanted a rough idea to google search and get an idea what i'm dealing with.
I'd really appreciate any help Thank you for your time.