I've recently been removing weeds from a border, and found some bulbs growing throughtout. I remember seeing them last year too (I believe they grow as something grass like but not sure if they flower). I also remember that previously when digging them up they get incredibly dense in the soil, to the point where I had to sheer through them with a spade to remove them last time.
At the moment they're in dribs and drabs, but I don't really want them coming back. Does anyone know what they are exactly and how I can rid myself of them?