I had a dying oak tree removed from my yard last year. Prior to that, I would get little saplings (or whatever they are called) growing up all around the base of the tree. They never got big since they were mowed down with the grass. Now that the tree is gone, these things have sprouted again due to the warm weather. If you pull them up there are runners everywhere.

How can you get rid of these things?

thanks

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MB-less