I have spent hundreds of dollars and dozens of hours planting a shaded area around my pergola with dense concentrations of Vinca Minor, only to see the bed infested with Creeping Charlie. I thought Vinca was supposed to choke out competing plants? After three years, I see little evidence of this. Every spring , it's a tussle royal between these two plants. After three years, Other than hand weeeding, is there anything that will get rid of the weed and not harm the Vinca?
Larry