If you want a tidy, no-fuss evergreen accent that stays naturally rounded, Thuja occidentalis 'Mr. Bowling Ball®' is a strong choice for foundations, borders, and containers. You get a dense, globe-like mound of soft, feathery sprays that holds green color through the seasons and adds reliable texture in winter.
Plan for a mature size of about 36-48 inches tall, with a similar width. Place it where it will receive full sun to part shade; brighter light helps keep the habit tight and the foliage fuller. In deeper shade, it can thin and lose density over time.
Give your plant a moist but well-drained soil to start, then water regularly until established. After that, aim for even moisture during extended dry spells. It tolerates a wide range of soil types and pH, but it performs best when roots are not sitting in soggy ground for long periods.
Little pruning is needed. If you want to refine the shape, do light touch-ups in early spring or after the first flush of growth, trimming only the green tips. Avoid cutting back into old, bare wood. In snowy climates, gently brush off heavy wet snow to help prevent branches from splaying.