Tulip pattern on german aircraft

[Chocks away!]

Does this marking have any significance? I know of the famous black tulip on Erich Hartman's aircraft, and a similar red one on an Bf 109 G flown by Herman Graff. Another famous aircraft sporting this insignia was a Bf 109 k-4 of Jg 52 in may 1945, though the pilot is unknown. Information on the red tulip, as well as the late war machine using it would be welcome...