  A seed is a PL sphere that is not obtainable by a wedge operation from any
other PL sphere. In this paper, we study two operations on PL spheres, known as
the stellar subdivision and the wedge, that preserve the maximality of
Buchstaber numbers and polytopality. We construct a new polytopal toric
colorable seed from these two operations. As a corollary, we prove that the
toric colorable seed inequality established by Choi and Park is tight.
