Do you plant mostly perennials, annuals, or something else?
I have a few annuals, but sometimes a once bloomed plant, can be beautiful. 
What's your favorite plant in your garden?
Honestly, I like trees the best, although there are fewer in my back yard. Wild flowers, sometimes irises too. And Irises are hearty plants. 
Irises are named after the Greek goddess of the rainbow! Do you have multiple colors of irises?
Purple yes, and a few gold or yellow. My favorite color of iris is maroon. 
DC hosts the National Cherry Blossom Festival. Have you ever been or would you want to go?
Cherry blossoms are the best. I have a cherry tree in my front yard, although they are messy, lots of leaves and pedals. They are beautiful. I have not been to the Festival you mention.
Cherry blossoms' peak bloom only lasts for a few days. Are they still beautiful after their peak bloom?
Depends on how you perceive beauty. I love the texture of the bark on the wood, the way the branches raise to the sky. 
What a nice way to think about them! I just found out some can grow to 35 feet tall. I always thought cherry blossoms were smaller than that!
They take a few years to get larger, to be sure. The wood can also be brittle and prone to fracturing. One cherry tree, during a big storm last year, split half off, had to be cut and taken away. They produce a pretty flower.
Do you know about Peach Tree Borers? Apparently they are little insects that get underneath the bark. The tree then gets gummy- weird!