Many countries have 'national flowers' - and the Cornflower is not only the national flower of Germany, but also the flower of Germanic Folk - Volksdeutsche, which means 'Racial German' - someone of Germanic Blood. As a result it has become the emblem for many Germanic cultural organisations found outside Germany, such as the Cornflower above - which is the emblem of the German American Steuben Parade.
The Cornflower also became the emblem for the VDU - a National Socialist organisation who supported German cultural relations abroad, for the same reasons.
Many Volksdeutsche served in the German armed forces during WW2 - including many Volkdeutsche from Hungary. Most served in the 22nd SS Volunteer Cavalry Division Maria Theresia - and again adopted the Cornflower as the unit insignia.