Mazus reptans 'Alba' (Creeping Mazus)
The classic filler-inner plant with a twist. Mazus grows only a few inches tall and creeps along the ground producing tiny leaves and blue/white flowers in spring. 'Alba' is, well, alba, the white form. Great for filling in around stepping stones, creeping along the edge of a mixed border or anywhere else you need a fill in. Takes a little foot traffic. Not bothered by deer.