Agave Attenuata

Agave angustifolia is an evergreen, succulent plant forming a large, rosette of leaves up to 100cm tall and, eventually, a flowering stem that can be up to 5 metres tall. ... An article setting out the reasons why Agave angustifolia should be treated as a distinct species with a different range to Agave vivipara..

Care 

Agave plants love going outside in the warm weather. During the fall and winter, when agave plants are resting, allow the top 75% of the soil to dry out before watering. In the spring & summer, when the plant is actively growing, water when the top 2"-3” of soil has dried out.