Sounds like this would work well in a suburb (already low maintenance) type garden with mulch and shrubs/trees etc. but since it only relies on plant height to

Sounds like this would work well in a suburb (already low maintenance) type garden with mulch and shrubs/trees etc. but since it only relies on plant height to determine what it kills would probably be terrible in a perennials garden where the desirable plants are sprouting up at different times for half of the year along with the weeds.