There is an image of this cultivar on the Hosta Library. From the photo on the HL website, it appears to be an upright growing, large size hosta with wavy, light blue-green leaves. The petioles are reddish purple in color. This non-registered cultivar was originated by Kathie Sisson of Connecticut. 

This hosta was named in honor of the late Margot Dargatz of Hosta Choice Nursery in Canada. Her grandchildren called her "Oma".