Trillium chloropetalum var. giganteum, is a selection of T. chloropetalum, which is native to the San Francisco Bay Area. As the name implies this form is robust and vigorous, but all forms of T. chloropetalum have performed beautifully for us. This variety is supposedly in propagation, but we have yet to see it in the marketplace. Nursery people have tried tissue culturing, but the results have not been good, as of yet. In the garden here we divide in the fall to make more offsets.