Greenovia is an infrequent flowering plant and there is evidence that it is monocarpic. This means it will flower once, eventually, and then die after it sets seed.

Read more at Gardening Know How: Learn About A Rose-Shaped Succulent Called Greenovia Dodrentalis https://www.gardeningknowhow.com/ornamental/cacti-succulents/greenovia/growing-greenovia-dodrentalis.htm