Posthumous Petal Records was a DIY label. It's only release seems to have been a single by Roses Are Red, 'I Can't Understand' b/w 'Your Love Is Like A Ballistic Missile', which came out in 1979 and had a catalogue number of PET-1. There are rumours of a second single by the band, 'Twinkle Twinkle Little Star' b/w 'I Heard It On The Radio' (PET-2; 1980), but it seems poorly attested. Presumably Roses Are Red owned the label. . Distributed By Posthumous Petal Records. Thanks to Robert Lyons For The Info.
Roses Are Red