This Russian Sage 'Little Spire' (Perovskia atriplicifolia) Main South Garden (MSG#24) was planted in June of 2006. It was taking over the garden. I am going to remove it this year but I waiting for it to bloom before digging it up.
"Love the lavender-blue flower spikes of Russian Sage, but don’t have the space? 'Little Spire' is the perfect choice for a border or small-space garden, growing to be only 24” tall. A tidy plant that won't flop over, this variety is hardy and extremely easy to grow. " -https://www.americanmeadows.com/perennials/russian-sage/russian-sage-little-spire