Agave americana: Also called century plant because it was once thought it took 100 years for the plant to flower; it usually blooms after 10 to 25 years, dying after blooming. Agave attenuata: This is a popular spineless variety known as the foxtail or dragon-tree agave. It grows around 4 to 5 feet tall and a bit wider. Agave parviflora: Its leaves have white markings and curling filaments ...