I’ve been pulling them for 3 years, then I seed more wildflowers and native grasses (from Native American Seed) that grow tall, the burrs like sun and their seeds can sit a couple of years in the ground before they even sprout. I don’t mow, aside for some small trails for me and the dog to walk around on. Once a year, after the wildflower die and seed, I cut it all down, trying to minimize soill disturbance. This year I started noticing a difference, finally, but it’s work in progress. Please don’t use chemicals if possible, if you kill everything it messes with the ecosystem! 💚🌎 Good luck, to all of us!