A new and unique x Mangave plant named ‘；Shadow Waltz’； characterized by a medium mound of broad, fleshy, mostly flat foliage with small flexible cream-colored marginal teeth and lacking sharp terminal spine. Foliage is upright to outwardly toward stem with a tendency to arch in maturity. The numerous flowers are upright to slightly outwardly, a mixture of yellowish-chartreuse becoming blushed or speckled with red in maturity, formed on stiff, branched stalks. The new plant is suitable for the garden or as a potted plant in the garden or home.
