Agave 'Nigra'Agave 'Nigra' at a glance: Agave 'Nigra' builds a dark, compact rosette of thick, rigid leaves with a sharkskin like surface, purple black margins, and a stout terminal spine that sharpens the whole geometry. The plant generally sits around 5060 cm tall and wide, staying slow and architectural rather than racing outward. Strong sun or the brightest indoor position keeps the leaf colour dense and the rosette tight. Use a gritty, very fast draining