Usui, traditionally mid-February, is when falling snow turns to rain, and is also the start of the clam season. The vernal equinox is when the sun rises due east and sets due west; vegetation begins to sprout and crops begin to stir. At this time of year, simmered dishes of bamboo shoots and clams make its appearance on dining tables. Celadon porcelain vessels are dressed with giant butterbur and young pepper leaves, heralding the arrival of young leaves.