b. cherry trees
William Howard Taft married the former Helen Herron on June 19, 1886.
The mark she left on Washington by planting the cherry trees around the tidal basin would be a huge accomplishment for any First Lady. It is even more impressive when you consider that Helen Taft suffered a stroke just two months after her husband took office.
Her recovery took about a year of hard work before she felt ready to resume her public duties.