There is a place in almost every garden for the calming effect of architectural or sculptural plants. These provide vivid contrast in texture and form to the blowsy, undisciplined character of many of our favorite perennials and shrubs. Some are grasses, some are yuccas, some are dasylirions, and many are agaves. Agave striata, with the common name of narrow-leaved century plant, is a distinctive example. Agave striata with Yucca baccata (behind) and Yucca parryi var. truncata (in front) Agave striata is a fairly small plant, two to three feet tall and wide, with a spherical rosette of