The difference between black and yellow corners of hydrangea is mainly reflected in appearance, color and taste. The skin of black hydrangea is dark purple or purple, and the surface of fruit is covered with tiny black thorns, hence the name "black horn". The skin of hydrangea is pale yellow or golden yellow with no obvious thorns. The pulp of hydrangea is crisp, juicy and crisp. But the flesh of hydrangea is relatively soft, slightly sticky and sweet. Therefore, the difference between black and yellow corners of hydrangea is mainly reflected in appearance, color and taste.