Volunteers assisted artist Walter Kuhn in setting up the red blooms, made of artificial silk and standing around 1m high.
When complete, the poppy field will number 3,000 blooms.
Kuhn, born in 1946, the year after World War II ended, also aims to erect a pavilion with the words “Never Again” written in various languages on its exterior walls.
Small loudspeakers installed in the pavilion will broadcast talks.
The installation will be formally opened on November 11 and will remain on show until December 2.
The red poppy is used as a symbol in Britain and Commonwealth countries to mark the armistice that ended hostilities in World War I.
France uses the blue cornflower.
In a similar act of commemoration, a sea of 888,246 ceramic red poppies – each representing one serviceman from Britain and its colonies killed in the war – was created in the moat of the Tower of London in 2014 to mark the start of World War I.