Some of my favorite plants are on this year's list of Gold Medal Plants announced by the Pennsylvania Horticultural Society. The American fringe tree (Chionanthus virginicus) should be used far more often than it is. It's a US native that's covered with airy, fringe-like white flowers in spring. It's not usually beset by disease or pests, and it's rather small, 12-20 feet high at maturity. It can be grown as a multi-stem shrub or pruned into a single-stem tree (my favorite form). It takes full sun to part shade, zones 5-8.
If you've never seen a Korean white pine (Pinus koraiensis), then get yourself quickly to a botanical garden or top-notch nursery. If I had room for an evergreen garden, this would definitely be one of the top specimens. It grows only to 30-40 feet tall and has striking long, blue-green needles that give the tree a lush, full appearance. You'll never plant another Eastern white pine if you see one of these. It's also takes stressful conditions and branches do not break easily in ice or snowstorms. Zones 4-7.
Dwarf Japanese-cedar
(Cryptomeria japonica 'Globosa Nana')
In my Washington DC garden, I had a dwarf Japanese-cedar ('Black Dragon') that was narrow and upright -- but this one, in the right place, would be just as attractive. It grows 3-4 feet tall and 4-8 feet wide with some years on it. The notable bluish-green needles turn a bronzy color in autumn.
Mount Airy witch alder
(Fothergilla x intermedia 'Mount Airy')
Fothergillas, of course, are best known for their bottle-brush flowers in spring and their deep, orange-red-to purple fall foliage. One of the best long-season shrubs, and it takes sun to shade in zones 5-8. This cultivar is 6 feet high and 6-8 feet wide, and has a suckering habit that will colonize an area over time.
To see the Gold Medal awards for perennials and groundcovers, visit the PHS Gold Medal page here. Gold Medal plants are selected for their attractiveness as well as resistance to diseases and pests.