I am artist doing a botanical drawing to be included in a exhibit of plants recorded by David Douglas. At this time of year I am not able to see the plant in bloom. From a combination of dozens of photos and countless sketches, I have been able to describe its growth habit BUT the scale eludes me. I am finding great variations in height (sources state from 1-5") and flower (size 2-5"). When you say the flowers are silver dollar size, is that the whole flower head or one of the multiple individual blossoms??

laurashea,
Sorry for the late response but sinus problems got the better of me.
I remember the whole bloom, a cluster of several individual flowers as a bit larger than a silver dollar anf it stood nearly 2 ft tall. I only grew it the for the first time last spring. After the severity of this past winter I have reservations about it's return this spring.
J