Here's one you probably haven't seen before.  The "Blue Angel" Impatiens has awesome blooms that almost look like blue hummingbirds!  This is a new Himalayan species whose name hasn't been determined yet.  This delightful Impatiens blooms all year long, and it happens to be easy to grow.  It is very rare - I don't know anyone else currently offering it.

 This is a perennial species that grows about 2 feet tall and wide.  It looks great in a hanging planter, where the blooms can be enjoyed at eye-level.  The 1½ inch flowers are bluish-lavender, which blends into yellow toward the curved "beak".  Inside the blooms are attractive orange markings.  It flowers in waves pretty much all year for me.  The blooms share a bird-like resemblance to my Impatiens arguta, however this a different species.

Like many Impatiens, it seems to be happiest between about 50 and 80 degrees F (10-27°C).  It is untested in warmer conditions, but it should be able to tolerate it if nights are cool.  I suspect it may get stressed if nights are warm (above 65°F / 18°C).  I don't know its cold hardiness, but it is able to grow back from the roots, so it should be hardy to at least 25° F (-4°C).  Like most Impatiens, it enjoys bright, filtered light.  Protect it from strong afternoon sun.  It prefers fertile, well-draining soil that's kept evenly moist.  Over about 40% humidity is best.