I would like to use ajuga 'chocolate chip' as groundcover. I have a strip of land that runs along the front of my house. It's a berm located between a busy street and a sidewalk. It is completely surrounded by a minimum of 4 ft of concrete (side walk, road, driveway)-- secluded enough to let ajuga take it over without it getting into my lawn or a neighbor's, I think. Is this a safe enough distance to keep it contained? I would like to hear of other's experiences with this type of ajuga.