Beautiful No-Mow Yards: convert ditches in landscape into a low-maintenance garden. Instead of covering the ditch with grass, plant a Swale Garden. These types of gardens help channel storm-water runoff, benefiting both the yard and local environment.
Bee balm (Monarda didyma, zones 4 to has become a favorite functional perennial of mine. I have used this plant to battle latent weed seed spikes of Canada thistle (Cirsium arvense, zones 3 to with little maintenance