Fall foliage is so much the province of woody plants that we're shocked—shocked!—that there are even a few slaggards. Perennials are the yin to this yang: only a few provide a credible show of fall foliage. Below, a vivid mash-up of prairie dock (the huge still-green leaves) and variegated shrub-mint. Spring and summer, the leaves of the latter were green splashed with white. For fall, most of that green has been ditched for pink and dark purple that would make any coleus proud.
Even as this perennial's foliage shouts that fall is here, its spikes of fluffy white flowers continue to develop, seemingly, in merry defiance. Like the prairie dock leaves, the shrub-mint flowers remain center stage regardless of merely cool weather; only serious frost brings their curtains down.