Yucca /Adam's Needle, fantastic choice for modern/ tropical style gardens. They require very little care, tolerate drought & have impressive flowers. The easiest way to propagate is through division of pups they produce at the base of the trunk plant them in Spring.
Yucca; architectural, drought tolerant and tough desert plant
Yucca aloifolia 'Variegata' - spectacular in bloom, and out. Watch for the sharp spines - this is a plant that demands respect. Give it a full sun situation, lots of gravel in the soil, and stand back.