Hand-pull grass, removing as much root as possible
Dig out sod and rhizomes with a spade or edging tool
Smother grass with cardboard and 3–6 inches of mulch
Cover grass with black plastic or landscape fabric for several weeks
Apply a non-selective herbicide only on targeted grass if needed
Reapply mulch regularly to block new grass growth
Install edging to prevent grass from spreading into beds
Keep beds densely planted to reduce open space for grass to invade
Water garden beds deeply but infrequently to favor desired plants over grass
Remove new grass shoots promptly before they spread