My sister lives in White Plains, NY and has decided she wants to do a flower box this year and asked for recommendations. It will be on the E-NE side of the house, fairly shaded and she would prefer to just let the rain take care of watering for her. My first thought was Coleus but I suspect she'll want some actual flowering plants. Any suggestions? I have Coleus, Hostas, and Daylilies in the few shaded areas of my yard so I'm not sure what to tell her.
If she wants to just leave it there with little attention, Heucheras will make her happy and will bloom. For constant blooms there are lots of annuals that she can put in. If she wants perennials, they will bloom only once or may re-bloom and Heucheras do very well. Also great with Heuchera and Coleus are Ipomeoa (Sweet Potato vine).
For that early sun exposure, she could also put in some Caladium bulbs. You cannot expect blooms, but the foliage is wonderful.