Dracaena marginata is an attractive, stiff-leaved plant with colorful foliage that sometimes goes by the name dragon tree. Most of the time, though, it’s sold simply as “Dracaena marginata” or just “Dracaena.” These are tough, drought-tolerant plants with aggressive root systems that make excellent houseplants—they are a little more forgiving than some of the other dracaena. It helps that they’re attractive and varied. They are sometimes grown as single-stemmed plants; other times grouped or even braided together in the same pot. NASA lists a dracaena marginata as a clean- air houseplant.