This has been the most awful year I can remember for weeds and grass growing in my perennial beds....often right THROUGH the perennials. Has anyone ever used an herbicide that can be sprayed to destroy the weeds and grass without harming the perennials? There is just too much for me to hand pull, especially the grass which is running rampant throughout the perennials.

There really isn't an herbicide to spray on broadleaved weeds over regular perennials. You probably could overspray patches of ornamental grasses that are infested with broadleaved weeds with a regular lawn type weedkiller -- probably? Maybe? I don't know, I haven't tried it, but I think it's likely that, if it doesn't harm turf grass, it probably wouldn't harm ornamental grasses. If anyone knows otherwise, please correct me.

Now, if you can CAREFULLY spray or otherwise apply the herbicide to the weeds without contacting the desired plants, that works. Perhaps something like this product would help you?