This reminds me of the poem "A Poison Tree" by William Blake. Seen in that light, the "blood flower" could represent buried hatred/resentment toward somebody that you never get over and just let grow into this sinister thing that ends up hurting people other than the one you wanted to. Ergo, "you'd better watch where you're walking, there might be someone's blood flower growing."
This reminds me of the poem "A Poison Tree" by William Blake. Seen in that light, the "blood flower" could represent buried hatred/resentment toward somebody that you never get over and just let grow into this sinister thing that ends up hurting people other than the one you wanted to. Ergo, "you'd better watch where you're walking, there might be someone's blood flower growing."