If you don't like to garden, stick a hydrangea or an azelea in and mulch. Otherwise, you want a flowering season that lasts. Is it sunny or shady? I have a lot of plants that would work in your zone in my garden ideabook. I usually note to zone. It's mostly plants that need some shade, though.

With more information , lot size, street location and direction that this corner is facing and a full view of the house of the house for context, I might be able to help you.