'Gigantosaurus' is one of the first hostas to emerge in the spring. Just like one of its parents, Empress Wu, it is massive with leaves that measure 44x 29 cm (17 x 11 in) at maturity. The large blue leaves have a wavy yellow margin. In summer the yellow margins turn to creamy white. Pale lavender flowers first begin appearing in early summer and are held just above the foliage.