It usually blooms from April to May every year, and the flowering period is generally about 10-15 days.

It is native to northern my country, especially the Loess Plateau and the Northeast and North China Plains. It is commonly cultivated in all parts of the north and south of my country. It is also distributed in Japan, North Korea and Vietnam. Alias: golden medicine tree, house-protecting tree, sophora bean, sophora rice, sophora pistil.

The Sophora japonica flowers all have one thing in common: one petal tilts back, with a slight hint of yellow on it. There are two small white petals on its left and right sides. The petal in the middle is curved, and inside is the yellow stamen! Its calyx is also formed according to the shape of the flower. When it is still a bud, the stamen is wrapped by layers of petals - the lying petals on the outside, the petals on both sides in the middle, and the small petals on the inside that protect when opened.