If you checked out the April 2012 tour of Garden on Sherlock Street, you probably saw the purple flowers scattered about in the back garden. They are dame's rocket. It self seeds easily. I let it find little places to sprout, and leave it up through the seed stage because the house finches are so fun to watch when they eat the seeds.
Along the patio, I do pull out the dame's rockets beyond a row at the edge. It's one of the few things in the garden that I grow in a row. I do this mostly because I need the rest of the bed off the patio to have space for other plants.
The first monarch butterfly I've seen this year was attacking the dame's rocket blooms.
This post is property of http://gardenonsherlockstreet.blogspot.com/