Catkins are boy parts, could you have a girl plant?

Pussy willows are dioecious. There are male pussy willow trees and female pussy willow trees. The buds, or catkins, on the male pussy willow trees look different from those on the females. The male catkins are showier, and it is the branches of the male trees that we seek for their "pussy willows."

Could be that or maybe an environmental stressor? too dry? too cold? pollution? Was it a grafted plant?