In 2000, Peter Ruh of Ohio registered this sport of H. 'Northern Halo' on behalf of the originator, Ken Herrema of Michigan. A 20 inch high and 40 inch wide plant, it bears near white flowers in mid-June.

According to The Hostapedia by Mark Zilis (2009), "...differs from 'Northern Halo' only by its misted, green and white margin, but just that makes this cultivar worth including in any collection."

An article about H. 'Allegan Fog' by Warren I. Pollock in The Hosta Journal (2002 Vol. 33 No. 2) states that, "This hosta is an introduction of Ken Herrema of Englerth Nursery in Hopkins, Michigan. 'Allegan Fog' is named after Allegan County where this nursery is located. Other hostas from this nursery, started by the late Larry Englerth, also have Allegan in their names. In 2000, Peter Ruh...registered three hostas for Ken Herrema: 'Allegan Fog', 'Allegan Emperor' and 'Allegan Gent'."