It's a mod that gives Whiterun more plants to give it a bit more color. When I got Skyrim I went a bit mod crazy and wanted to see which ones would be ok on my computer. I was having some lag issues so I completely unsubscribed all of my environment mods that I downloaded from the workshop. But one of them is still there in my game even though I've unsubbed from it. I've made new characters and it's still there. At first I didn't mind it but now I just want it gone and I've also triple checked my sub list to make sure it's not there. All the other towns are fine and normal it's just Whiterun though.