The answer is Mr. Bowling Ball arborvitae (Thuja occidentalis ‘Bobazam’). The shrub is petite but provides a punch. The foliage is sage green with a slight blue cast in sunlight.

Mr. Bowling Ball arborvitae (Thuja occidentalis 'Mr Bowling Ball') is a compact, rounded shrub with bright green, fine-textured foliage. It works well in small spaces and as foundation plantings ...

One of the best shrub arborvitaes is ‘Mr. Bowling Ball‘, Thuja occidentalis ‘Bobozam.’ This dwarf shrub only grows two to three feet tall and wide with feathery evergreen foliage that ...