15" tall x 18" wide (cutting propagated). This is a knockout performer from Germany, valued for its sturdy, compact stature, summer-long blooming habit and unique, clear blue flowers. Like an unsung hero, 'Blue Hill' blends subtly into your garden bringing out the best in other plants, highlighting the colors of the flowers that surround it. Modest amounts of water and any enriched garden soil keep this plant happy and blooming.