Now this is one tall plant! Fort Griffin State Historic Site's Century Plant (Agave Americana) is blooming - all the way to 18 feet. This native plant is known for its height and only occasional flowering. After the plant blooms, it dies, but new shoots sprout from its base continuing its growth. The plant has an average life span of 28 years. Pictured with Fort Griffin's blooming beauty is Eric Abercrombie, assistant site manager of the fort.