This is 2-4 m (6.5-13 ft) tall, with dense tufts of as many as 50. These are more than 50 cm (20 in) long, up to 10 cm (4 in) wide at the base, vivid blue-green, and red-toothed on the margin. The inflorescence is branched and composed of glowing yellow .
To produce flowers, A. marlothii requires plenty of light, warm conditions in summer, and cool conditions in winter. Water only in very hot weather; do not.