This is likely a yucca, a full-sun succulent with great architectural value in the garden. Its flower spikes are taller than the plant itself. Water this drought-tolerant plant sparingly. Depending on the species or cultivar some remain 3 ft. tall but others can grow 10-12 ft. tall and 8 ft. wide so be careful about siting it near walls, sidewalks, and irrigation pipes. As Yucca mature, their trunks become a bulbous mass and can crack walls, pipes, etc. and the leaves are very sharp. Feed with a slow-release or organic fertilizer only if you want the plant to grow faster. Landscaping with Native Plants of Texas, books.google.com/books?isbn=0760325391, has great info on Yuccas. If you google Yuccas Native to Texas, the pages will come up.
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