This grower is sure of this plant identification.
This agave has very narrow needle like leaves, which form a half circle.
Hedgehog, Blue hedgehog, Rabo de león
Agave stricta (Hedgehog). This succulent, evergreen perennial has mid-green leaves that grow up to 40cm long, with red-brown terminal spines. In summer it bears dense erect clusters of red-to-purple flowers on 2 meter long stems.
If growing under glass, use a cactus compost and grow in a position of bright, filtered light. Water occasionally and feed in the summer, but keep dry in the winter.
Grown for its form and foliage. A good container plant.