question about mishna shevi’is

i haven’t learned anything in a really long time but there’s a community siyyum so the time seemed right. anyway, my question is about חורש, specifically plowing an orchard

there’s gotta be some other meaning other than plowing, or something i’m just not getting- you don’t plow an orchard if it already has trees in it, right? plowing is prepping soil for planting. why would these farmers (ranchers, hobbyists, urban foodies, whatever) be plowing an orchard where they have trees already that they want to presumably keep?

am i making this too hard on myself? is it just face value? where can i go to answer these questions, because it’s definitely a block for me getting to move to the next mishna