Big Red One

This week I noticed a bed of flowers laid out in a big red "1"

 just south of the 1st Division monument:

The red numeral is the insignia of the US Army's 1st Infantry Division, which therefore is known as "the Big Red One". The monument base names battles fought in WW I, the war to end all wars: the campaigns of WW II are on a smaller slab of granite off to the west.

I had never seen the flowers. A guard told me that indeed they are planted every year. I neglected to ask, and don't know whether they arrive for the anniversary of D Day--the 1st Division landed at Omaha Beach--or for the birthday of the US Army (June 14), or simply when such flowers bloom.