What does red and blue peach blossom mean?

Divination terminology.

Peach blossoms are deciduous trees. The leaves are elliptic-lanceolate, the leaf margin is coarsely serrated and hairless, and the petiole is 1-2cm long. The height can reach 3 ~ 10 meter. There are usually 1 to several glands; Leaf blade elliptic-lanceolate to obovate-lanceolate, with serrated edges and glabrous on both sides. Flowers are usually solitary, born on open leaves, about 2.5-3.5 cm in diameter, with short stalks; Sepals 5, basally united into short calyx tube, glabrous.