Cryptomeria japonica 'Mushroom' is a flat-topped, globose, dwarf selection of Japanese cedar with juvenile foliage that is light green in spring and summer, later transitioning to a dramatic russet-brown in winter. Typical rate of growth in most areas is 2 to 3 inches (5 - 7 cm) per year, resulting a mounded, mushroom-shaped specimen 20 inches (50 cm) tall and 30 inches (70 cm) or more wide after 10 years in the garden.