Excerpt - page 45: "... Superior' I )ease clusters on dark steins of large, white flowers with dark stannens, hom earl ... )ifferent Groups). Of the 22 perennial species, most are native to open, dry, rocky areas in ..."
Excerpt - page 43: "... or near the soil surface; if planted too deeply, these perennials not only might not flower, but they can also rot. Particular care must be taken ..."