Hosta 'Empress Wu' is the largest growing hosta on the market...a cross derived from forcing Hosta 'Big John' into some unnatural self-satisfaction. Our guess is that Hosta 'Empress Wu' has both Hosta sieboldiana and Hosta nigrescens in its background. In the garden, our vigorous three-year-old plants are already 3' tall x 6' wide, on their way to a mature size of 4' tall x 9' wide. The extremely large clumps of glossy green leaves that emerge blue-green in spring are topped with 5' tall stalks of light lavender flowers in June (NC). As you no doubt guessed, Hosta 'Empress Wu' is named after the late Empress Wu...the only female emperor of China.