James Frelichowski wrote: " Shrub = any plant that gathers leaves, walmart bags or fast food cups and keeps them for your yard cleaning leisure." If that's the case, then sub-shrubs must be the highly specialized ones which gather only hoagie wrappers. Note for those of you who don't know about one of Philadelphia's contribution to great American cuisine: a hoagie is what is more widely known as a submarine. Jim McKenney