Did Friedrich the Great of Prussia Change Record to Leave Them Eat Cake?

Friedrich the Great of Prussia made potatoes appear valuable by having them guarded heavily, but guarded heavily by day only at night. He also managed to persuade Mary Antoinette to wear a posy of potato flowers in her bosom. The publicity stunts were good, but they didn't really succeed in completely popularizing the potatoes. So he tried a new tactic and hired heavily on guards to give a show of guard in the potatoes.