Although Hortus III gives the height of D. rupestre as 8-24 inches, this plant is elsewhere described as being a mat-forming, 10" x 10" o...Read Morer 12" x 15".
Hardy between zones 4 and 8
Native from West China and Mongolia
Blooms early to midsummer
Needs sun with some mid-day shade and good drainage
Is used as a tea substitute in China
"This plant is often sold [as] D. grandiflorum. One way to tell the two species apart is that the petioles of the middle cauline leaves are 2-6 cm long on the true D. grandiflorum - while D. rupestre has very short or no petioles."
Although Hortus III gives the height of D. rupestre as 8-24 inches, this plant is elsewhere described as being a mat-forming, 10" x 10" o...Read More