Yucca Linearis. Yucca Linearifolia 
The Yucca Linearis or Yucca Linearifolia is a beautiful, tall, relatively slow growing sculptural yucca perfect for providing a dramatic accent to your garden design.
One of the most cold tolerant, it is hardy to drought, heat as well as severe cold when established, down to temperatures of -15 degrees. It’s narrow, flexible leaves are arranged forming a perfectly spherical head.

Different from other species it has some remarkable qualities, if it’s growing point is somehow damaged it will grow new heads from the trunk and it is also a Yucca which forms mutiple trunks at it’s base