How do I get rid of the baby trees growing in my backyard?


I don't know the real name for these little "trees", but their bodies are made of bark just like the regular trees. They're all over the yard. I cannot even pull them out, and no way can they be mowed down. It's like they're embedded in cement. Does anyone know how to

to get rid of them and keep them from growing again? I'm totally clueless. Thank you.

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