Plant hormone found in all higher plants. It is involved in the process of abscission and also inhibits stem elongation, germination of seeds, and the sprouting of buds.
The top left trigram symbolizes summer, south, and heaven. The top right trigram represents autumn, west, and the moon. The bottom right trigram stands for winter, north, and the Earth. The bottom left trigram represents spring, east, and the sun. Effective date: 21 February 1984.