Although the Hosta Registrar attempts to gather all pertinent information about a hosta prior to its registration, there is occasionally a need to make changes, updates or to add previously unknown data. The registrant may wish to change the description of certain plant traits such as mature plant size or variegation colors after observing the hosta over a longer period. Flower color was, for some reason, omitted from many early registrations so this is often added. More accurate data on the originator, nominant (person who named the plant) and introducer may come to light later and need to be changed.

Like the original registration, these changes become "official" once they are printed in the annual Registrations publication of The American Hosta Society.