Full Speed A Hedge Thin Man arborvitae is a stunning super-skinny, fast-growing arborvitae! It’s the perfect choice for screens and privacy hedges where ground space is at a premium. Despite its extremely narrow, columnar habit, it still has a fast growth rate, so you can get the privacy you need quickly. Thin Man thuja holds its winter color very well, providing lush green interest in the garden year-round.