The Russian Hibiscus, which is neither Russian nor a Hibiscus, is a perennial that looks more like a shrub, or at least that’s what came to my mind the first time I saw it.
Excellent large plant for the back of a shaded area, although I understand that can also grow in full sun.
Large, white malva-like flowers that provide a continuous display from July to fall, and leaves resembling those of Vitis sp. (grapevines), hence the epithet vitifolia.
Germination: warm germinator.