Answer: There is a huge variety of flowers you could grow. Your choice should be based on the growing conditions where you want to plant them. For example, is it sunny or shady and at what time of day, what kind of soil is there, is it extra wet or dry or average moisture, is it windy in that spot and how much space is available for the plant to grow?
It is also important to have the soil prepared and ready to plant as the earlier you can plant, the better. (As the season moves into hot summer days it is more difficult for the plants to become established so they may not perform their best.)
However, some easy to grow perennials that tend to do well in your area would include daylilies (Hemerocallis), tall border phlox, sedum and purple coneflower for sun; for shade perhaps hostas of all kinds along with Lamium. Annuals for sun would include petunias, geraniums, and salvias. For shade, impatiens are always a good choice.
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