Sentinels of the southwestern deserts, yuccas are extremely drought tolerant and store water in their trunks or bulbous bases. Their foliage grows in rosette form either at ground level or on stalks, trunks or branches. Many have leaves that are razor sharp and spine tipped, earning them common names of Spanish bayonet and Spanish dagger.Yuccas are slow-growers and need almost no maintenance to survive. Their toughness is both a virtue and a vice, as they can be nearly impossible to get rid of once firmly established and larger clumping types may take over