Cercis Canadensis forest pansy- why are the leaves only green not autumn or purple?

Question

I bought a forest pansy tree from a private seller in winter last year.
Each spring it has pink flowers but then the leaves come and they are only green – no purple colour at all. the tree is around 6 feet tall and in full sun.

Answer 1

Forest Pansy redbud should flower in spring, then emerging leaves should be reddish purple. The leaves then fade to green in heat of summer. In fall the leaves should turn yellow.

I would say the private seller may have his trees mixed up and sold you a different variety of redbud. Or, if it was a seedling from his Forest Pansy, it most likely would not reproduce true to type from seed.

https://www.gardeningknowhow.com/ornamental/trees/redbud/growing-forest-pansy-tree.htm