Sequoiadendron giganteum 'Glaucum' - Blue Giant SequoiaAnother form of the Giant sequoia that has striking blue green foliage on a narrowly pyramidal tree. The more or less fastigiate branches will have the best color in spring with the new growth. After 10 years, a specimen will measure 16 feet (5 m) tall and 4. 5 feet (1. 5 m) wide, an annual growth rate of 1. 5 to 2 feet. This form is purported to be cold hardier than many other giant sequoia cultivars. This form was first described in 1860 by