  We study Lagrange spectra of Veech translation surfaces, which are a
generalization of the classical Lagrange spectrum. We show that any such
Lagrange spectrum contains a Hall ray. As a main tool, we use the boundary
expansion developed by Bowen and Series to code geodesics in the corresponding
Teichm\"uller disk and prove a formula which allows to express large values in
the Lagrange spectrum as sums of Cantor sets.
