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The Yucca rostrata forms an elegant trunk as the upward growing leaves mature from the base, and the Yucca rostrata is surrounded with a circular progression of needle-like leaves that are straightly attached to the trunk, and the trunk and each branch is very sharply encircled with spines at the leaf terminals. The Yucca rostrata is estimated to be the most cold tolerant yucca that survives winter cold temperatures in zone 5.The Yucca rostrata produces flat, blue-gray leaves. As the lower leaves of the Yucca rostrata mature, they turn brown and fall down parallel to the trunk and become attached to the trunk by a glue-like material that is found underneath each leaf. The beautiful Yucca rostrata landscape specimen can form several branches at the top covered with blue-gray leaves like grass filaments, with a height up to 15 feet tall. A colony of Yucca rostrata is often used in commercial xeroscapes. Yucca rostrata do well in dry soils and are very drought tolerant.