I just LOVE my Knock Out rose bush! It blooms like that all summer long. That bush was very small when we first got it a few years ago, and it grew that large in a very short time. I've actually trimmed it back a couple times. It would make a great privacy hedge if you planted several together in a row.
And I love seeing my lavender in bloom too. That one was twice the size last year, I cut at least half of it off a couple months ago. Ahh spring, my favorite time of the year! :)