‘DeGroot's Spire’ is the narrow one: a tight column of dark green foliage held in twisted, spiralling sprays, climbing to 15–20 feet while staying 4–5 feet wide. That twist is what sets it apart from the plain columnar arborvitaes.

Full sun to part sun in well-drained soil. It keeps the column without shearing, so it suits places where height is wanted and width is not — flanking a door, screening one window, or giving a bed a vertical full stop.