Originally known as Decoration Day, the day of remembrance was first observed on May 30 in 1868. General John Logan made the proclamation earlier that month to decorate the graves of both Union and Confederate soldiers at Arlington Cemetery.
The Southern states who were at one time Confederate chose not to recognize the holiday and decorated their veterans' graves on a different date until after World War I when the day of remembrance was expanded to include soldiers from conflicts beyond just the Civil War.
While those who sell cemetery wreaths would like you to decorate the graves of all loved ones who have passed on, Memorial Day was specifically intended to remember and honor those who served our country in the military.