I have a hill in my front yard (about 3-4 ft. ) leading down to the road. So that we don't have to weedwhack it, I'd like to plant a ground cover, and really like the look of creeping phlox. To plant this (I'd probably buy small plants that have already been started, not seeds) I am wondering how to prepare the grassy hill. Do I need to till it all up? Or just the area where I place the plants? Will the plants just expand out over the grass and smother it? (ideal)
Thanks so much for your help!