A revamped organization to promote the sale of roses, the Garden Rose Council, plans its first national ad campaign. It will begin in December with "Plant roses, it's simple" as the theme, combating the perception that roses are fussy while opening new markets. Moses Anshell, Phoenix, is the agency. The council, formerly the Rose Information Bureau, said it represents more than 90% of the nation's garden rose production. The council is a committee of the All-America Rose Selections, a non-profit organization that chooses and promotes new award-winning varieties of garden roses..