These estimates for how long Yucca schottii takes to sprout, grow and harvest are from real observations from real gardeners, right around the world.
Yucca schottii can reach a height of as much as 20 feet (6 m), though more often plants are in the 10 to 15 foot range (3 to 4.5 m). It has sword-shaped blue-green leaves which are 1½ to 3 feet long (to just under a meter), somewhat stiff but still bendable. They have sharp tips and a very narrow dark brown margin, without the curling threads seen on the leaf margins of some other species of Yucca.
Yucca schottii (Schott's Yucca) - Probably the tallest yucca for southern New England gardens, growing up to 10' feet tall with a multi-branched top. Several varieties with yellow or blueish leaves are available.
Yucca Schottii, or more commonly know as Schott's Yucca, is a tree shrub subshrub of the genus Yucca. Its duration is perennial which means it will grow year after year. Yucca Schottii or Schott's Yucca's floral region is North America US Lower 48, specifically in the states of Arizona and New Mexico.