Many of the worlds finest flower gardens can be found nestled at the foot, or feet, of a deciduous tree. Or more than likely under a small grove of such trees.
We like colors and textures in our dappled places, hosta are great backbone plants but it’s the boldness of begonia and impatiens among others that add zest and zing to those otherwise unattended places.
Begonia, Santa Cruz Sunset, full sun-full shade, 12-16" tall, these are fantastic performers
Begonia, San Francisco, full sun-full shade, 12-16" tall, very floriferous
Begonia, Waterfall, Encanto Orange-Red, mounding-trailing variety, 12-18" tall, part sun-part shade, will tolerate full sun in cool summer areas
Vinca Minor, Illumination, zone 5 perennial, sun-shade, 3-6" tall, nice trailing/spreading variety